feat(web): stale-while-revalidate caches to eliminate tab-switch flicker

Sidebar tabs, Settings, and drill-in detail pages re-fetched on every
visit (loading=true + onMount), flashing an empty skeleton frame on each
navigation. Add an SWR cache layer so revisiting a view renders cached
data instantly while refreshing in the background.

- resourceCache.ts: single-value + keyed (per-id) SWR cache factories
- caches.ts: per-resource cache instances; resetAllCaches() on logout
- eventsSnapshot.ts: warm-seed snapshot for the SSE/paginated events page
- List/sidebar pages read $cache.value via $derived, refresh() on mount;
  mutations refresh the cache
- Settings forms seed once from settingsCache (edit-safe) and refetch
  after save (PUT /api/settings returns {status}, not the Settings object)
- Detail [id] pages warm-seed per id; apps/[id] seeds {workload,containers},
  resets non-seeded panels on warm nav, clears workload on 404, and
  invalidates its cache entry on delete

Deferred (still cold-fetch): triggers/[id] (webhook secret + multi-fetch
body gate), apps/new (create wizard).

web/src/lib/stores/caches.ts

@@ -0,0 +1,246 @@
+/**
+ * Module-scoped resource caches for sidebar list pages.
+ *
+ * Each cache is a stale-while-revalidate store (see `resourceCache.ts`). Pages
+ * read the value via `$store` and call `.refresh()` in `onMount` (and after
+ * mutations). Because these instances live at module scope, their data
+ * survives navigation, so revisiting a tab renders instantly instead of
+ * flashing a skeleton frame.
+ *
+ * Reset them all on logout so a different user never sees the previous
+ * session's cached data.
+ */
+
+import * as api from '$lib/api';
+import type {
+	RedeployTrigger,
+	EventTrigger,
+	MetricAlertRule,
+	LogScanRule,
+	LogScanStats,
+	SharedSecret,
+	AuthSettings,
+	AuthUser
+} from '$lib/api';
+import type {
+	Workload,
+	Container,
+	ContainerView,
+	ProxyRoute,
+	App,
+	StaleContainer,
+	Settings,
+	Registry,
+	BackupInfo,
+	DnsRecordView
+} from '$lib/types';
+import {
+	createResourceCache,
+	createKeyedResourceCache,
+	type ResourceCache,
+	type KeyedResourceCache
+} from './resourceCache';
+import { clearEventsSnapshot } from './eventsSnapshot';
+
+// ── Single-resource caches ──────────────────────────────────────────────
+export const workloadsCache = createResourceCache<Workload[]>(
+	(signal) => api.listWorkloads(undefined, signal),
+	[]
+);
+
+export const containersCache = createResourceCache<ContainerView[]>(
+	(signal) => api.listContainers({}, signal),
+	[]
+);
+
+export const proxyRoutesCache = createResourceCache<ProxyRoute[]>(
+	(signal) => api.listProxyRoutes(signal),
+	[]
+);
+
+export const triggersCache = createResourceCache<RedeployTrigger[]>(
+	(signal) => api.listTriggers(undefined, signal),
+	[]
+);
+
+export const eventTriggersCache = createResourceCache<EventTrigger[]>(
+	(signal) => api.listEventTriggers(signal),
+	[]
+);
+
+export const metricAlertRulesCache = createResourceCache<MetricAlertRule[]>(
+	() => api.listMetricAlertRules(),
+	[]
+);
+
+// ── Composite caches (pages that load several resources together) ─────────
+export interface LogScanData {
+	rules: LogScanRule[];
+	stats: LogScanStats | null;
+}
+export const logScanCache = createResourceCache<LogScanData>(
+	async (signal) => {
+		const [rules, stats] = await Promise.all([
+			api.listLogScanRules(),
+			api.getLogScanStats(signal).catch(() => null)
+		]);
+		return { rules, stats };
+	},
+	{ rules: [], stats: null }
+);
+
+export interface SharedSecretsData {
+	secrets: SharedSecret[];
+	apps: App[];
+}
+export const sharedSecretsCache = createResourceCache<SharedSecretsData>(
+	async (signal) => {
+		// App load failure is non-fatal — app-scoped rows fall back to a
+		// truncated id when the name lookup misses.
+		const [secrets, apps] = await Promise.all([
+			api.listSharedSecrets(),
+			api.listApps(signal).catch(() => [] as App[])
+		]);
+		return { secrets, apps };
+	},
+	{ secrets: [], apps: [] }
+);
+
+export interface DashboardData {
+	workloads: Workload[];
+	containers: ContainerView[];
+	stale: StaleContainer[];
+	unusedImagesMB: number;
+	unusedImagesCount: number;
+	unusedImagesExceeded: boolean;
+}
+export const dashboardCache = createResourceCache<DashboardData>(
+	async (signal) => {
+		// Each list falls back to empty so a single slow daemon (e.g. Docker
+		// stats) does not blank the whole dashboard.
+		const [workloads, containers, stale] = await Promise.all([
+			api.listWorkloads(undefined, signal),
+			api.listContainers({}, signal).catch(() => [] as ContainerView[]),
+			api.fetchStaleContainers(signal).catch(() => [] as StaleContainer[])
+		]);
+		let unusedImagesMB = 0;
+		let unusedImagesCount = 0;
+		let unusedImagesExceeded = false;
+		try {
+			const s = await api.getUnusedImageStats(signal);
+			unusedImagesMB = s.total_size_mb;
+			unusedImagesCount = s.count;
+			unusedImagesExceeded = s.exceeded;
+		} catch {
+			/* non-critical */
+		}
+		return { workloads, containers, stale, unusedImagesMB, unusedImagesCount, unusedImagesExceeded };
+	},
+	{ workloads: [], containers: [], stale: [], unusedImagesMB: 0, unusedImagesCount: 0, unusedImagesExceeded: false }
+);
+
+// Shared global Settings object. Backs both the settings sub-layout (which
+// derives the proxy provider for its sub-nav) and the settings landing form.
+// `value` is null until first load — consumers guard with `?.`.
+export const settingsCache = createResourceCache<Settings | null>(
+	(signal) => api.getSettings(signal),
+	null
+);
+
+// Settings subpages with their own (non-/settings) data sources.
+export const registriesCache = createResourceCache<Registry[]>(() => api.listRegistries(), []);
+export const backupsCache = createResourceCache<BackupInfo[]>(() => api.listBackups(), []);
+export const authSettingsCache = createResourceCache<AuthSettings | null>(
+	() => api.getAuthSettings(),
+	null
+);
+export const usersCache = createResourceCache<AuthUser[]>(
+	async () => (await api.listUsers()) ?? [],
+	[]
+);
+
+// ── Drill-in LIST pages (single-value SWR) ────────────────────────────────
+export const staleContainersCache = createResourceCache<StaleContainer[]>(
+	(signal) => api.fetchStaleContainers(signal),
+	[]
+);
+
+export interface DnsData {
+	records: DnsRecordView[];
+	wildcardDns: boolean;
+}
+export const dnsCache = createResourceCache<DnsData>(
+	async (signal) => {
+		const [s, records] = await Promise.all([api.getSettings(signal), api.getDnsRecords()]);
+		return { records, wildcardDns: s.wildcard_dns ?? true };
+	},
+	{ records: [], wildcardDns: true }
+);
+
+// ── DETAIL pages (keyed by route param) ───────────────────────────────────
+// Per-id caches so revisiting a detail (or navigating A→B→A) renders the
+// cached entity instantly while revalidating. Detail-FORM pages seed their
+// editable fields once per id from these (see the pages for the guard).
+// apps/[id] warm-seeds BOTH the workload and its containers so the live-status
+// badge (which reads containers.length) shows last-known state on revisit
+// rather than flashing a wrong "not deployed" before the fetch resolves.
+export interface WorkloadDetailSeed {
+	workload: Workload;
+	containers: Container[];
+}
+export const workloadDetailCache = createKeyedResourceCache<WorkloadDetailSeed>(
+	async (key, signal) => ({
+		workload: await api.getWorkload(key, signal),
+		containers: await api.listWorkloadContainers(key, signal)
+	})
+);
+export const triggerDetailCache = createKeyedResourceCache<RedeployTrigger>(
+	(key, signal) => api.getTrigger(key, signal)
+);
+export const eventTriggerDetailCache = createKeyedResourceCache<EventTrigger>(
+	(key, signal) => api.getEventTrigger(Number(key), signal)
+);
+export const logScanRuleDetailCache = createKeyedResourceCache<LogScanRule>(
+	(key, signal) => api.getLogScanRule(Number(key), signal)
+);
+export const metricAlertRuleDetailCache = createKeyedResourceCache<MetricAlertRule>(
+	(key, signal) => api.getMetricAlertRule(Number(key), signal)
+);
+export const sharedSecretDetailCache = createKeyedResourceCache<SharedSecret>(
+	(key, signal) => api.getSharedSecret(key, signal)
+);
+
+const keyedCaches: KeyedResourceCache<unknown>[] = [
+	workloadDetailCache,
+	triggerDetailCache,
+	eventTriggerDetailCache,
+	logScanRuleDetailCache,
+	metricAlertRuleDetailCache,
+	sharedSecretDetailCache
+] as KeyedResourceCache<unknown>[];
+
+/** Every cache, for bulk reset on logout. */
+const allCaches: ResourceCache<unknown>[] = [
+	workloadsCache,
+	containersCache,
+	proxyRoutesCache,
+	triggersCache,
+	eventTriggersCache,
+	metricAlertRulesCache,
+	logScanCache,
+	sharedSecretsCache,
+	dashboardCache,
+	settingsCache,
+	registriesCache,
+	backupsCache,
+	authSettingsCache,
+	usersCache,
+	staleContainersCache,
+	dnsCache
+] as ResourceCache<unknown>[];
+
+export function resetAllCaches(): void {
+	for (const c of allCaches) c.reset();
+	for (const c of keyedCaches) c.reset();
+	clearEventsSnapshot();
+}

web/src/lib/stores/eventsSnapshot.ts

@@ -0,0 +1,33 @@
+/**
+ * Warm-start snapshot for the Event Log page.
+ *
+ * The events page can't use the standard resource cache (`caches.ts`) because
+ * its list is paginated, mutated by live SSE pushes, and edited by deletes —
+ * far more than a fetch-and-replace list. Instead it keeps working in local
+ * component state and mirrors the latest list/stats here. On revisit the page
+ * seeds from this snapshot so it paints the last-known events immediately
+ * instead of flashing a skeleton, then refreshes in the background.
+ *
+ * Module-scoped (survives navigation, cleared on logout via `resetAllCaches`).
+ */
+
+import type { EventLogEntry, EventLogStats } from '$lib/types';
+
+export interface EventsSnapshot {
+	events: EventLogEntry[];
+	stats: EventLogStats;
+}
+
+let snapshot: EventsSnapshot | null = null;
+
+export function getEventsSnapshot(): EventsSnapshot | null {
+	return snapshot;
+}
+
+export function saveEventsSnapshot(s: EventsSnapshot): void {
+	snapshot = s;
+}
+
+export function clearEventsSnapshot(): void {
+	snapshot = null;
+}

web/src/lib/stores/resourceCache.ts

@@ -0,0 +1,209 @@
+/**
+ * Stale-while-revalidate resource cache.
+ *
+ * Backs list pages so that switching between sidebar tabs doesn't flash an
+ * empty/skeleton frame on every visit. The first visit to a page does a cold
+ * load (skeleton shown once); every subsequent visit renders the previously
+ * loaded value immediately while a background refresh keeps it current.
+ *
+ * The cache is module-scoped (one instance per resource, created in
+ * `caches.ts`) so its value survives component unmount/remount across
+ * client-side navigation — that persistence is what removes the flicker.
+ *
+ * Style mirrors `navCounts.ts`: a classic `writable` exposed as a `Readable`
+ * plus imperative `refresh()`/`set()` methods, so pages keep using `$store`
+ * auto-subscription.
+ */
+
+import { writable, get, type Readable } from 'svelte/store';
+
+export interface ResourceState<T> {
+	/** Last successfully loaded value (or the initial seed before first load). */
+	value: T;
+	/**
+	 * True only during the *cold* load — i.e. the resource has never loaded
+	 * successfully and there is no error yet. Drives the skeleton. Stays false
+	 * for background refreshes so revisits never flash.
+	 */
+	loading: boolean;
+	/** True while any fetch (cold or background) is in flight. */
+	refreshing: boolean;
+	/** Last error message, or '' when the most recent fetch succeeded. */
+	error: string;
+	/** Whether at least one fetch has ever succeeded. */
+	loaded: boolean;
+}
+
+export interface ResourceCache<T> extends Readable<ResourceState<T>> {
+	/**
+	 * (Re)fetch the resource. Aborts any in-flight fetch so the latest call
+	 * wins — important after a mutation, where a stale background refresh must
+	 * not clobber fresh data. Safe to call from `onMount` on every visit.
+	 */
+	refresh(): Promise<void>;
+	/** Optimistically replace the cached value (e.g. after a local mutation). */
+	set(value: T): void;
+	/** Clear back to the cold/initial state (e.g. on logout). */
+	reset(): void;
+}
+
+export function createResourceCache<T>(
+	fetcher: (signal?: AbortSignal) => Promise<T>,
+	initial: T
+): ResourceCache<T> {
+	const seed: ResourceState<T> = {
+		value: initial,
+		loading: true,
+		refreshing: false,
+		error: '',
+		loaded: false
+	};
+	const store = writable<ResourceState<T>>(seed);
+
+	let inFlight: AbortController | null = null;
+
+	async function refresh(): Promise<void> {
+		// Latest-wins: cancel a previous in-flight fetch so a slow background
+		// refresh can't overwrite a newer (e.g. post-mutation) result.
+		if (inFlight) inFlight.abort();
+		const ac = new AbortController();
+		inFlight = ac;
+
+		store.update((s) => ({ ...s, refreshing: true, error: '' }));
+		try {
+			const value = await fetcher(ac.signal);
+			if (ac.signal.aborted) return;
+			store.set({ value, loading: false, refreshing: false, error: '', loaded: true });
+		} catch (e) {
+			if (ac.signal.aborted) return;
+			const error = e instanceof Error ? e.message : String(e);
+			// Keep the last good value (stale-while-revalidate) and surface the
+			// error; clear `loading` so the cold skeleton resolves to either data
+			// or an error state rather than spinning forever.
+			store.update((s) => ({ ...s, loading: false, refreshing: false, error }));
+		} finally {
+			if (inFlight === ac) inFlight = null;
+		}
+	}
+
+	function set(value: T): void {
+		store.update((s) => ({ ...s, value, loaded: true, loading: false }));
+	}
+
+	function reset(): void {
+		if (inFlight) {
+			inFlight.abort();
+			inFlight = null;
+		}
+		store.set({ ...seed, value: initial });
+	}
+
+	return { subscribe: store.subscribe, refresh, set, reset };
+}
+
+// ─────────────────────────────────────────────────────────────────────────
+// Keyed (per-id) variant — for detail pages fetched by a route param.
+//
+// A single-value cache can't serve detail pages (each `[id]` is different
+// data). This holds a Map<id, state> so revisiting (or A→B→A navigating) a
+// detail renders the cached entity instantly while revalidating that id.
+// Pages read reactively via `$cache.get(id)` (the store value is the Map) and
+// call `cache.refresh(id)` / `cache.peek(id)` (methods on the object).
+// ─────────────────────────────────────────────────────────────────────────
+
+export interface KeyedResourceState<T> {
+	/** Last loaded value for this key, or null before its first load. */
+	value: T | null;
+	/** True on the cold load for this key (never loaded, no error). */
+	loading: boolean;
+	/** True while a fetch for this key is in flight. */
+	refreshing: boolean;
+	error: string;
+	loaded: boolean;
+}
+
+function coldKeyed<T>(): KeyedResourceState<T> {
+	return { value: null, loading: true, refreshing: false, error: '', loaded: false };
+}
+
+export interface KeyedResourceCache<T> extends Readable<Map<string, KeyedResourceState<T>>> {
+	/** (Re)fetch one key; aborts a prior in-flight fetch for the same key. */
+	refresh(key: string): Promise<void>;
+	/** Optimistically replace one key's value (e.g. after a mutation). */
+	set(key: string, value: T): void;
+	/** Non-reactive snapshot read; returns the cold state if the key is absent. */
+	peek(key: string): KeyedResourceState<T>;
+	/** Drop a single key (e.g. after deleting that entity) so a later visit
+	 *  doesn't warm-seed a stale/phantom value. */
+	remove(key: string): void;
+	/** Drop all keys (e.g. on logout). */
+	reset(): void;
+}
+
+export function createKeyedResourceCache<T>(
+	fetcher: (key: string, signal?: AbortSignal) => Promise<T>
+): KeyedResourceCache<T> {
+	const store = writable<Map<string, KeyedResourceState<T>>>(new Map());
+	const inFlight = new Map<string, AbortController>();
+
+	function patch(key: string, partial: Partial<KeyedResourceState<T>>): void {
+		store.update((m) => {
+			const next = new Map(m);
+			next.set(key, { ...(next.get(key) ?? coldKeyed<T>()), ...partial });
+			return next;
+		});
+	}
+
+	async function refresh(key: string): Promise<void> {
+		const prev = inFlight.get(key);
+		if (prev) prev.abort();
+		const ac = new AbortController();
+		inFlight.set(key, ac);
+
+		patch(key, { refreshing: true, error: '' });
+		try {
+			const value = await fetcher(key, ac.signal);
+			if (ac.signal.aborted) return;
+			patch(key, { value, loaded: true, loading: false, refreshing: false, error: '' });
+		} catch (e) {
+			if (ac.signal.aborted) return;
+			patch(key, {
+				loading: false,
+				refreshing: false,
+				error: e instanceof Error ? e.message : String(e)
+			});
+		} finally {
+			if (inFlight.get(key) === ac) inFlight.delete(key);
+		}
+	}
+
+	function set(key: string, value: T): void {
+		patch(key, { value, loaded: true, loading: false });
+	}
+
+	function peek(key: string): KeyedResourceState<T> {
+		return get(store).get(key) ?? coldKeyed<T>();
+	}
+
+	function remove(key: string): void {
+		const ac = inFlight.get(key);
+		if (ac) {
+			ac.abort();
+			inFlight.delete(key);
+		}
+		store.update((m) => {
+			if (!m.has(key)) return m;
+			const next = new Map(m);
+			next.delete(key);
+			return next;
+		});
+	}
+
+	function reset(): void {
+		for (const ac of inFlight.values()) ac.abort();
+		inFlight.clear();
+		store.set(new Map());
+	}
+
+	return { subscribe: store.subscribe, refresh, set, peek, remove, reset };
+}

web/src/routes/+layout.svelte

@@ -13,6 +13,7 @@
 	import { logout as apiLogout } from '$lib/api';
 	import { t } from '$lib/i18n';
 	import { navCounts, startNavCountsPolling, stopNavCountsPolling, refreshNavCounts } from '$lib/stores/navCounts';
+	import { resetAllCaches } from '$lib/stores/caches';
 	import { health, startHealthPolling, stopHealthPolling, refreshHealth } from '$lib/stores/health';
 	import { effectiveTimezone, formatOffsetLabel } from '$lib/stores/timezone';
 	import { fmt } from '$lib/format/datetime';
@@ -357,6 +358,7 @@
 					onclick={async () => {
 						try { await apiLogout(); } catch { /* best effort */ }
 						clearAuth();
+						resetAllCaches();
 						goto('/login');
 					}}
 					class="rounded-md p-1.5 text-[var(--text-tertiary)] hover:text-[var(--color-danger)] transition-colors"

web/src/routes/+page.svelte

@@ -6,8 +6,7 @@
 	// We no longer fan out N+1 fetches per project to gather instance
 	// status — the global containers index already carries the workload
 	// reference and state.
-	import type { ContainerView, StaleContainer, Workload } from '$lib/types';
-	import * as api from '$lib/api';
+	import { dashboardCache } from '$lib/stores/caches';
 	import SkeletonCard from '$lib/components/SkeletonCard.svelte';
 	import EmptyState from '$lib/components/EmptyState.svelte';
 	import SystemHealthCard from '$lib/components/SystemHealthCard.svelte';
@@ -20,54 +19,24 @@
 	import { t } from '$lib/i18n';
 	import { fmt } from '$lib/format/datetime';
 
-	let workloads = $state<Workload[]>([]);
-	let containers = $state<ContainerView[]>([]);
-	let staleContainers = $state<StaleContainer[]>([]);
-	let unusedImagesMB = $state(0);
-	let unusedImagesCount = $state(0);
-	let unusedImagesExceeded = $state(false);
-	let loading = $state(true);
-	let error = $state('');
-	let loadController: AbortController | null = null;
+	// Cache-backed (stale-while-revalidate) so switching back to the dashboard
+	// renders the last-known figures immediately instead of flashing skeleton
+	// cards. The composite cache fans out the same parallel reads (each with an
+	// empty fallback) and aborts a prior in-flight refresh on the next call.
+	// See caches.ts.
+	const workloads = $derived($dashboardCache.value.workloads);
+	const containers = $derived($dashboardCache.value.containers);
+	const staleContainers = $derived($dashboardCache.value.stale);
+	const unusedImagesMB = $derived($dashboardCache.value.unusedImagesMB);
+	const unusedImagesCount = $derived($dashboardCache.value.unusedImagesCount);
+	const unusedImagesExceeded = $derived($dashboardCache.value.unusedImagesExceeded);
+	const loading = $derived($dashboardCache.loading);
+	const error = $derived($dashboardCache.error);
 
-	async function loadDashboard() {
-		loadController?.abort();
-		const controller = new AbortController();
-		loadController = controller;
-		const signal = controller.signal;
-
-		loading = true;
-		error = '';
-		try {
-			// Parallelize the cheap top-level reads. Each falls back to an
-			// empty list so a single slow daemon (e.g. Docker stats) does
-			// not blank the entire dashboard.
-			const [wls, ctrs, stale] = await Promise.all([
-				api.listWorkloads(undefined, signal),
-				api.listContainers({}, signal).catch(() => [] as ContainerView[]),
-				api.fetchStaleContainers(signal).catch(() => [] as StaleContainer[])
-			]);
-			workloads = wls;
-			containers = ctrs;
-			staleContainers = stale;
-
-			try {
-				const imgStats = await api.getUnusedImageStats(signal);
-				unusedImagesMB = imgStats.total_size_mb;
-				unusedImagesCount = imgStats.count;
-				unusedImagesExceeded = imgStats.exceeded;
-			} catch { /* non-critical */ }
-		} catch (e) {
-			if (e instanceof DOMException && e.name === 'AbortError') return;
-			error = e instanceof Error ? e.message : $t('dashboard.loadFailed');
-		} finally {
-			loading = false;
-		}
-	}
+	const loadDashboard = () => dashboardCache.refresh();
 
 	$effect(() => {
 		loadDashboard();
-		return () => { loadController?.abort(); };
 	});
 
 	// Plugin-native workloads only. Legacy pre-cutover rows (kind project/

web/src/routes/apps/+page.svelte

@@ -1,14 +1,17 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
-	import type { Workload } from '$lib/types';
-	import * as api from '$lib/api';
 	import { IconPlus, IconRefresh } from '$lib/components/icons';
 	import ForgeHero from '$lib/components/ForgeHero.svelte';
+	import { workloadsCache } from '$lib/stores/caches';
 	import { t } from '$lib/i18n';
 
-	let workloads = $state<Workload[]>([]);
-	let loading = $state(true);
-	let error = $state('');
+	// Cache-backed (stale-while-revalidate): the value persists across
+	// navigation, so revisiting this tab renders the table immediately instead
+	// of flashing the cold skeleton. The skeleton only shows on the very first
+	// visit of the session.
+	const workloads = $derived($workloadsCache.value);
+	const loading = $derived($workloadsCache.loading);
+	const error = $derived($workloadsCache.error);
 	let filter = $state<'all' | string>('all');
 
 	// Plugin-native rows are those with a source_kind. trigger_kind is no
@@ -27,17 +30,7 @@
 		pluginRows.filter((w) => w.source_kind === kind).length
 	);
 
-	async function load() {
-		loading = true;
-		error = '';
-		try {
-			workloads = await api.listWorkloads();
-		} catch (e) {
-			error = e instanceof Error ? e.message : $t('apps.list.loadError');
-		} finally {
-			loading = false;
-		}
-	}
+	const load = () => workloadsCache.refresh();
 
 	function sourceBadge(kind: string): string {
 		switch (kind) {

web/src/routes/apps/[id]/+page.svelte

@@ -2,6 +2,7 @@
 	import { onDestroy } from 'svelte';
 	import { goto } from '$app/navigation';
 	import { page } from '$app/stores';
+	import { get } from 'svelte/store';
 	import type { Container, EventLogEntry, PluginWorkloadInput, Workload } from '$lib/types';
 	import type { RedeployTrigger, WorkloadTriggerBinding } from '$lib/api';
 	import * as api from '$lib/api';
@@ -65,15 +66,26 @@
 	import { fmt } from '$lib/format/datetime';
 	import { formatBytes } from '$lib/format/bytes';
 	import { connectGlobalEvents, toEventLogEntry, type SSEConnection } from '$lib/sse';
+	import { workloadDetailCache } from '$lib/stores/caches';
 
 	// Route params come back as `string | undefined`; the route file
 	// guarantees `id` exists, but the empty-string fallback satisfies
 	// the type checker — server validation rejects empty ids anyway.
 	const id = $derived($page.params.id ?? '');
 
-	let workload = $state<Workload | null>(null);
-	let containers = $state<Container[]>([]);
-	let loading = $state(true);
+	// Warm-seed the workload from the per-id cache so the body — gated on
+	// `loading && !workload` — skips the full-page skeleton on revisit (the
+	// other sections populate when load() resolves). Seeding synchronously at
+	// init (not just in the load effect) avoids even a one-frame skeleton on a
+	// fresh mount. Edit-mode forms seed on-demand from `workload`, so there is
+	// no on-load form state to clobber.
+	const _seed = workloadDetailCache.peek(get(page).params.id ?? '').value;
+	let workload = $state<Workload | null>(_seed?.workload ?? null);
+	// Containers are seeded too (not just the workload) so the live-status badge
+	// + Stop/Start toolbar reflect last-known state on a warm revisit instead of
+	// momentarily reading the empty array as "not deployed".
+	let containers = $state<Container[]>(_seed?.containers ?? []);
+	let loading = $state(_seed == null);
 	let error = $state('');
 	let deploying = $state(false);
 	let deployRef = $state('');
@@ -903,7 +915,28 @@
 	);
 
 	async function load() {
-		loading = true;
+		const k = id;
+		// Reused-component nav (A→B): warm-seed B's header instantly if cached;
+		// a cold id keeps the skeleton until the fetch resolves.
+		const cached = workloadDetailCache.peek(k);
+		if (cached.value) {
+			workload = cached.value.workload;
+			containers = cached.value.containers;
+			// Reset the non-seeded dependent panels so a reused-component warm
+			// nav (A→B) never renders the previous id's chain / bindings / rules
+			// / env / volumes under the new id's header; they repopulate when
+			// this id's Promise.all below resolves.
+			chain = null;
+			bindings = [];
+			logRules = [];
+			envRows = [];
+			volumeRows = [];
+			chainError = '';
+			logRulesError = '';
+			bindingsError = '';
+		} else {
+			loading = true;
+		}
 		error = '';
 		try {
 			const [w, c, env, vols, ch, lr, bs] = await Promise.all([
@@ -924,8 +957,12 @@
 					return [] as WorkloadTriggerBinding[];
 				})
 			]);
+			// Bail if the route id changed mid-flight — a newer load() owns the
+			// page state and applying this stale result would clobber it.
+			if (id !== k) return;
 			workload = w;
 			containers = c;
+			workloadDetailCache.set(k, { workload: w, containers: c });
 			envRows = env;
 			volumeRows = vols;
 			chain = ch;
@@ -970,9 +1007,16 @@
 				// session storage may be disabled — ignore.
 			}
 		} catch (e) {
+			if (id !== k) return;
+			// Clear the (possibly warm-seeded) workload so a 404 / failed load
+			// resolves to the clean error page instead of a phantom, interactive
+			// detail UI for an entity that no longer exists.
+			workload = null;
 			error = e instanceof Error ? e.message : $t('apps.detail.loadError');
 		} finally {
-			loading = false;
+			// Only the current id's load may clear the skeleton — a stale load
+			// returning early must not flip a newer load's loading state.
+			if (id === k) loading = false;
 		}
 	}
 
@@ -1391,6 +1435,9 @@
 		error = '';
 		try {
 			await api.deletePluginWorkload(id);
+			// Drop the cached entry so navigating back to this (now-deleted) id
+			// doesn't warm-seed a phantom detail page.
+			workloadDetailCache.remove(id);
 			goto('/apps');
 		} catch (e) {
 			error = e instanceof Error ? e.message : $t('apps.detail.deleteError');

web/src/routes/containers/+page.svelte

@@ -2,7 +2,7 @@
 	import { goto } from '$app/navigation';
 	import { page } from '$app/stores';
 	import type { ContainerView, WorkloadKind } from '$lib/types';
-	import * as api from '$lib/api';
+	import { containersCache } from '$lib/stores/caches';
 	import EmptyState from '$lib/components/EmptyState.svelte';
 	import SkeletonCard from '$lib/components/SkeletonCard.svelte';
 	import ForgeHero from '$lib/components/ForgeHero.svelte';
@@ -14,10 +14,15 @@
 	// allContainers holds the unfiltered list — kind/state filters are applied
 	// client-side so the tab counters reflect the whole population, not the
 	// current narrowed view (otherwise picking "Project" would show All=0).
-	let allContainers = $state<ContainerView[]>([]);
-	let loading = $state(true);
-	let refreshing = $state(false);
-	let error = $state('');
+	//
+	// Cache-backed (stale-while-revalidate): the list persists across
+	// navigation, so revisiting this tab renders immediately instead of
+	// flashing the cold skeleton. The cache's abort-on-refresh replaces the
+	// previous manual `loadSeq` race guard.
+	const allContainers = $derived($containersCache.value);
+	const loading = $derived($containersCache.loading);
+	const refreshing = $derived($containersCache.refreshing);
+	const error = $derived($containersCache.error);
 
 	// Filters seed from query string so the tab is shareable / refresh-safe.
 	const initialKind = (() => {
@@ -32,24 +37,9 @@
 	let stateFilter = $state(initialState);
 	let searchTerm = $state(initialQ);
 
-	async function load(initial: boolean): Promise<void> {
-		if (initial) loading = true;
-		else refreshing = true;
-		error = '';
-		try {
-			// Race-safety: keep the latest fetch's result and discard stragglers.
-			const seq = ++loadSeq;
-			const containers = await api.listContainers({});
-			if (seq !== loadSeq) return;
-			allContainers = containers;
-		} catch (e) {
-			error = e instanceof Error ? e.message : $t('containers.errLoad');
-		} finally {
-			loading = false;
-			refreshing = false;
-		}
-	}
-	let loadSeq = 0;
+	// `initial` is retained for call-site compatibility; the cache distinguishes
+	// the cold load (skeleton) from background refreshes on its own.
+	const load = (_initial = false): Promise<void> => containersCache.refresh();
 
 	$effect(() => {
 		void load(true);

web/src/routes/containers/stale/+page.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
-	import type { StaleContainer } from '$lib/types';
 	import * as api from '$lib/api';
+	import { staleContainersCache } from '$lib/stores/caches';
 	import ConfirmDialog from '$lib/components/ConfirmDialog.svelte';
 	import EmptyState from '$lib/components/EmptyState.svelte';
 	import SkeletonCard from '$lib/components/SkeletonCard.svelte';
@@ -10,37 +10,19 @@
 	import { t } from '$lib/i18n';
 	import { fmt } from '$lib/format/datetime';
 
-	let containers = $state<StaleContainer[]>([]);
-	let loading = $state(true);
-	let error = $state('');
+	// Cache-backed (stale-while-revalidate) so revisiting renders instantly
+	// instead of flashing the cold skeleton; the cache aborts a prior in-flight
+	// fetch on the next refresh (replacing the old manual loadController guard).
+	const containers = $derived($staleContainersCache.value);
+	const loading = $derived($staleContainersCache.loading);
+	const error = $derived($staleContainersCache.error);
 
 	let confirmSingleId = $state('');
 	let confirmBulk = $state(false);
 	let cleaningIds = $state<Set<string>>(new Set());
 	let bulkCleaning = $state(false);
 
-	let loadController: AbortController | null = null;
-
-	async function loadStale() {
-		loadController?.abort();
-		const ac = new AbortController();
-		loadController = ac;
-		loading = true;
-		error = '';
-		try {
-			const rows = await api.fetchStaleContainers(ac.signal);
-			if (ac.signal.aborted) return;
-			containers = rows;
-		} catch (e) {
-			if (ac.signal.aborted) return;
-			error = e instanceof Error ? e.message : $t('stale.loadFailed');
-		} finally {
-			if (loadController === ac) {
-				loading = false;
-				loadController = null;
-			}
-		}
-	}
+	const loadStale = () => staleContainersCache.refresh();
 
 	function requestCleanup(id: string) {
 		confirmSingleId = id;
@@ -52,7 +34,7 @@
 		cleaningIds = new Set([...cleaningIds, id]);
 		try {
 			await api.cleanupStaleContainer(id);
-			containers = containers.filter((c) => c.container.id !== id);
+			await staleContainersCache.refresh();
 			toasts.success($t('stale.cleanedUp'));
 		} catch (e) {
 			toasts.error(e instanceof Error ? e.message : $t('stale.cleanupFailed'));
@@ -68,7 +50,7 @@
 		bulkCleaning = true;
 		try {
 			const result = await api.bulkCleanupStaleContainers();
-			containers = [];
+			await staleContainersCache.refresh();
 			toasts.success($t('stale.bulkCleanedUp', { count: String(result.deleted) }));
 		} catch (e) {
 			toasts.error(e instanceof Error ? e.message : $t('stale.cleanupFailed'));
@@ -79,7 +61,6 @@
 
 	$effect(() => {
 		loadStale();
-		return () => loadController?.abort();
 	});
 </script>
 

web/src/routes/dns/+page.svelte

@@ -1,15 +1,18 @@
 <script lang="ts">
-	import { getDnsRecords, syncDnsRecords, deleteDnsRecord, getSettings } from '$lib/api';
-	import type { DnsRecordView } from '$lib/types';
+	import { get } from 'svelte/store';
+	import { syncDnsRecords, deleteDnsRecord } from '$lib/api';
+	import { dnsCache } from '$lib/stores/caches';
 	import { toasts } from '$lib/stores/toast';
 	import { t } from '$lib/i18n';
 	import { IconSearch, IconRefresh, IconTrash, IconLoader } from '$lib/components/icons';
 	import Skeleton from '$lib/components/Skeleton.svelte';
 	import ForgeHero from '$lib/components/ForgeHero.svelte';
 
-	let loading = $state(true);
-	let records = $state<DnsRecordView[]>([]);
-	let wildcardDns = $state(true);
+	// Cache-backed (stale-while-revalidate) so revisiting renders records
+	// instantly instead of flashing the cold skeleton. See caches.ts.
+	const records = $derived($dnsCache.value.records);
+	const wildcardDns = $derived($dnsCache.value.wildcardDns);
+	const loading = $derived($dnsCache.loading);
 	let syncing = $state(false);
 
 	// Filters
@@ -37,16 +40,9 @@
 	});
 
 	async function loadRecords() {
-		loading = true;
-		try {
-			const settings = await getSettings();
-			wildcardDns = settings.wildcard_dns ?? true;
-			records = await getDnsRecords();
-		} catch (err) {
-			toasts.error(err instanceof Error ? err.message : $t('dns.loadFailed'));
-		} finally {
-			loading = false;
-		}
+		await dnsCache.refresh();
+		const { error } = get(dnsCache);
+		if (error) toasts.error(error || $t('dns.loadFailed'));
 	}
 
 	async function handleSync() {
@@ -66,7 +62,7 @@
 		try {
 			await deleteDnsRecord(fqdn);
 			toasts.success($t('dns.recordDeleted', { fqdn }));
-			records = records.filter(r => r.fqdn !== fqdn);
+			await dnsCache.refresh();
 		} catch (err) {
 			toasts.error(err instanceof Error ? err.message : $t('dns.deleteFailed'));
 		}

web/src/routes/event-triggers/+page.svelte

@@ -1,29 +1,21 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
-	import * as api from '$lib/api';
 	import type { EventTrigger } from '$lib/api';
+	import { eventTriggersCache } from '$lib/stores/caches';
 	import { IconPlus, IconRefresh } from '$lib/components/icons';
 	import ForgeHero from '$lib/components/ForgeHero.svelte';
 	import { t } from '$lib/i18n';
 
-	let triggers = $state<EventTrigger[]>([]);
-	let loading = $state(true);
-	let error = $state('');
+	// Cache-backed (stale-while-revalidate) so revisiting this tab renders the
+	// list immediately instead of flashing the cold skeleton. See caches.ts.
+	const triggers = $derived<EventTrigger[]>($eventTriggersCache.value);
+	const loading = $derived($eventTriggersCache.loading);
+	const error = $derived($eventTriggersCache.error);
 
 	const enabledCount = $derived(triggers.filter((t) => t.enabled).length);
 	const disabledCount = $derived(triggers.length - enabledCount);
 
-	async function load(): Promise<void> {
-		loading = true;
-		error = '';
-		try {
-			triggers = await api.listEventTriggers();
-		} catch (e) {
-			error = e instanceof Error ? e.message : 'Failed to load event triggers';
-		} finally {
-			loading = false;
-		}
-	}
+	const load = () => eventTriggersCache.refresh();
 
 	// Render a short, comma-separated filter summary so the list table can
 	// fit each trigger in a single row without a sub-table. The

web/src/routes/event-triggers/[id]/+page.svelte

@@ -3,6 +3,7 @@
 	import { page } from '$app/stores';
 	import * as api from '$lib/api';
 	import type { EventTrigger, EventTriggerInput, NotificationTestResult } from '$lib/api';
+	import { eventTriggerDetailCache } from '$lib/stores/caches';
 	import ForgeHero from '$lib/components/ForgeHero.svelte';
 	import ToggleSwitch from '$lib/components/ToggleSwitch.svelte';
 	import ConfirmDialog from '$lib/components/ConfirmDialog.svelte';
@@ -51,33 +52,57 @@
 		}
 	});
 
+	function seedForm(tr: EventTrigger): void {
+		name = tr.name;
+		filterSeverity = tr.filter_severity;
+		filterSource = tr.filter_source;
+		filterMessageRegex = tr.filter_message_regex;
+		actionTarget = tr.action_target;
+		// Server returns either "" (no secret) or a placeholder when one is
+		// configured. Keep the value so an unchanged echo round-trips as "no
+		// change."
+		actionSecret = tr.action_secret;
+		secretConfigured = tr.action_secret !== '';
+		enabled = tr.enabled;
+	}
+
+	// Keyed warm-seed: on revisit, render the cached trigger instantly and seed
+	// the editable form ONCE per id (a background revalidation never re-seeds,
+	// so unsaved edits survive). `seededKey` is intentionally a plain (non-
+	// reactive) var so the $effect below depends only on `id`.
+	let seededKey: string | null = null;
+
 	async function load(): Promise<void> {
 		if (id === null) {
 			error = 'Invalid trigger id';
 			loading = false;
 			return;
 		}
-		loading = true;
-		error = '';
-		try {
-			const tr = await api.getEventTrigger(id);
-			trigger = tr;
-			name = tr.name;
-			filterSeverity = tr.filter_severity;
-			filterSource = tr.filter_source;
-			filterMessageRegex = tr.filter_message_regex;
-			actionTarget = tr.action_target;
-			// Server returns either "" (no secret) or a placeholder
-			// when one is configured. Keep the value in state so an
-			// unchanged echo round-trips as "no change."
-			actionSecret = tr.action_secret;
-			secretConfigured = tr.action_secret !== '';
-			enabled = tr.enabled;
-		} catch (e) {
-			error = e instanceof Error ? e.message : 'Failed to load trigger';
-		} finally {
+		const k = String(id);
+		const cached = eventTriggerDetailCache.peek(k);
+		if (cached.value) {
+			trigger = cached.value;
+			if (seededKey !== k) { seedForm(cached.value); seededKey = k; }
 			loading = false;
+		} else {
+			loading = true;
 		}
+		error = '';
+		await eventTriggerDetailCache.refresh(k);
+		// Bail if the route id changed while we were fetching — a newer load()
+		// now owns the page state; applying this stale result would clobber it.
+		if (id === null || String(id) !== k) return;
+		const entry = eventTriggerDetailCache.peek(k);
+		if (entry.error && !cached.value) {
+			error = entry.error || 'Failed to load trigger';
+			loading = false;
+			return;
+		}
+		if (entry.value) {
+			trigger = entry.value;
+			if (seededKey !== k) { seedForm(entry.value); seededKey = k; }
+		}
+		loading = false;
 	}
 
 	async function save(e?: Event): Promise<void> {
@@ -99,6 +124,9 @@
 			trigger = await api.updateEventTrigger(id, body);
 			actionSecret = trigger.action_secret;
 			secretConfigured = trigger.action_secret !== '';
+			// Keep the cache warm-fresh for the next visit (doesn't touch the
+			// form — seededKey already matches this id).
+			eventTriggerDetailCache.set(String(id), trigger);
 		} catch (e) {
 			error = e instanceof Error ? e.message : 'Save failed';
 		} finally {

web/src/routes/events/+page.svelte

@@ -10,6 +10,7 @@
 	import { toasts } from '$lib/stores/toast';
 	import { connectGlobalEvents, toEventLogEntry, type SSEConnection, type EventLogSSEPayload } from '$lib/sse';
 	import type { EventLogEntry, EventLogStats } from '$lib/types';
+	import { getEventsSnapshot, saveEventsSnapshot } from '$lib/stores/eventsSnapshot';
 	import EventLogEntryComponent from '$lib/components/EventLogEntry.svelte';
 	import EventLogFilter from '$lib/components/EventLogFilter.svelte';
 	import EmptyState from '$lib/components/EmptyState.svelte';
@@ -18,9 +19,13 @@
 
 	// ── State ─────────────────────────────────────────────────────
 
-	let events = $state<EventLogEntry[]>([]);
-	let stats = $state<EventLogStats>({ info: 0, warn: 0, error: 0, total: 0 });
-	let loading = $state(true);
+	// Warm-start from the last-known snapshot so switching back to this tab
+	// paints the previous events immediately instead of a skeleton; a
+	// background refresh in onMount then brings it current. See eventsSnapshot.ts.
+	const seed = getEventsSnapshot();
+	let events = $state<EventLogEntry[]>(seed?.events ?? []);
+	let stats = $state<EventLogStats>(seed?.stats ?? { info: 0, warn: 0, error: 0, total: 0 });
+	let loading = $state((seed?.events.length ?? 0) === 0);
 	let loadingMore = $state(false);
 	let hasMore = $state(true);
 	let newEventIds = $state<Set<number>>(new Set());
@@ -61,7 +66,10 @@
 		const currentOffset = append ? offset : 0;
 		if (append) {
 			loadingMore = true;
-		} else {
+		} else if (events.length === 0) {
+			// Only show the skeleton on a true cold load. When we already have
+			// (seeded or previously loaded) events, refresh in place so the list
+			// never blanks out — this is what removes the tab-switch flicker.
 			loading = true;
 		}
 
@@ -135,6 +143,13 @@
 		loadEvents();
 	}
 
+	// Mirror the current list + stats into the module snapshot so the next
+	// visit can warm-start. Cheap (stores references); keeps the snapshot fresh
+	// through loads, SSE pushes, and deletes without touching each mutation site.
+	$effect(() => {
+		saveEventsSnapshot({ events, stats });
+	});
+
 	// ── Client-side text filter ──────────────────────────────────
 
 	const filteredEvents = $derived(

web/src/routes/log-scan-rules/+page.svelte

@@ -1,21 +1,22 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
-	import * as api from '$lib/api';
-	import type { LogScanRule, LogScanStats } from '$lib/api';
+	import type { LogScanRule } from '$lib/api';
+	import { logScanCache } from '$lib/stores/caches';
 	import { IconPlus, IconRefresh } from '$lib/components/icons';
 	import ForgeHero from '$lib/components/ForgeHero.svelte';
 	import { t } from '$lib/i18n';
 
-	let rules = $state<LogScanRule[]>([]);
-	let loading = $state(true);
-	let error = $state('');
+	// Cache-backed (stale-while-revalidate) so revisiting this tab renders the
+	// list immediately instead of flashing the cold skeleton. See caches.ts.
+	// Scanner stats are loaded alongside the rule list (non-fatal) so the
+	// operator sees drop counters + compile errors next to the rules causing
+	// them. Named `scanStats` to avoid colliding with the `{#snippet stats()}`
+	// slot below that feeds the hero.
+	const rules = $derived<LogScanRule[]>($logScanCache.value.rules);
+	const scanStats = $derived($logScanCache.value.stats);
+	const loading = $derived($logScanCache.loading);
+	const error = $derived($logScanCache.error);
 	let filter = $state<'all' | 'global' | 'workload' | 'override'>('all');
-	// Scanner stats are loaded alongside the rule list so the
-	// operator sees drop counters + compile errors next to the rules
-	// causing them. Failure to load is non-fatal — the rules table
-	// is the primary content. Named `scanStats` to avoid colliding
-	// with the `{#snippet stats()}` slot below that feeds the hero.
-	let scanStats = $state<LogScanStats | null>(null);
 
 	const globals = $derived(rules.filter((r) => r.workload_id === '' && r.overrides_id === 0));
 	const workloadOnly = $derived(
@@ -37,22 +38,7 @@
 		}
 	});
 
-	async function load(): Promise<void> {
-		loading = true;
-		error = '';
-		try {
-			const [rs, st] = await Promise.all([
-				api.listLogScanRules(),
-				api.getLogScanStats().catch(() => null)
-			]);
-			rules = rs;
-			scanStats = st;
-		} catch (e) {
-			error = e instanceof Error ? e.message : 'Failed to load log scan rules';
-		} finally {
-			loading = false;
-		}
-	}
+	const load = () => logScanCache.refresh();
 
 	function scopeLabel(r: LogScanRule): string {
 		if (r.overrides_id !== 0) {

web/src/routes/log-scan-rules/[id]/+page.svelte

@@ -3,6 +3,7 @@
 	import { page } from '$app/stores';
 	import * as api from '$lib/api';
 	import type { LogScanRule, LogScanRuleInput, LogScanTestResult } from '$lib/api';
+	import { logScanRuleDetailCache } from '$lib/stores/caches';
 	import ForgeHero from '$lib/components/ForgeHero.svelte';
 	import ToggleSwitch from '$lib/components/ToggleSwitch.svelte';
 	import ConfirmDialog from '$lib/components/ConfirmDialog.svelte';
@@ -49,41 +50,67 @@
 		}
 	});
 
+	function seedForm(r: LogScanRule): void {
+		name = r.name;
+		pattern = r.pattern;
+		severity = r.severity;
+		streams = r.streams;
+		cooldownSeconds = r.cooldown_seconds;
+		enabled = r.enabled;
+	}
+
+	// Best-effort scope-label resolution (fire-and-forget); failure falls back
+	// to the truncated id. Runs once per id alongside the form seed.
+	async function resolveScopeName(r: LogScanRule, k: string): Promise<void> {
+		if (!r.workload_id) {
+			scopedWorkloadName = '';
+			return;
+		}
+		try {
+			const w = await api.getWorkload(r.workload_id);
+			// Ignore a late response if we've since navigated to another id.
+			if (String(id) === k) scopedWorkloadName = w.name;
+		} catch {
+			if (String(id) === k) scopedWorkloadName = '';
+		}
+	}
+
+	// Keyed warm-seed: render the cached rule instantly on revisit and seed the
+	// editable form ONCE per id (a background revalidation never re-seeds, so
+	// unsaved edits survive). Plain (non-reactive) so the $effect tracks only id.
+	let seededKey: string | null = null;
+
 	async function load(): Promise<void> {
 		if (id === null) {
 			error = 'Invalid rule id';
 			loading = false;
 			return;
 		}
-		loading = true;
-		error = '';
-		try {
-			const r = await api.getLogScanRule(id);
-			rule = r;
-			name = r.name;
-			pattern = r.pattern;
-			severity = r.severity;
-			streams = r.streams;
-			cooldownSeconds = r.cooldown_seconds;
-			enabled = r.enabled;
-			// Best-effort: resolve the workload name for the scope
-			// label. Failure here doesn't block the rest of the page —
-			// scopeLabel falls back to the truncated id.
-			if (r.workload_id) {
-				try {
-					const w = await api.getWorkload(r.workload_id);
-					scopedWorkloadName = w.name;
-				} catch {
-					scopedWorkloadName = '';
-				}
-			} else {
-				scopedWorkloadName = '';
-			}
-		} catch (e) {
-			error = e instanceof Error ? e.message : 'Failed to load rule';
-		} finally {
+		const k = String(id);
+		const cached = logScanRuleDetailCache.peek(k);
+		if (cached.value) {
+			rule = cached.value;
+			if (seededKey !== k) { seedForm(cached.value); resolveScopeName(cached.value, k); seededKey = k; }
 			loading = false;
+		} else {
+			loading = true;
 		}
+		error = '';
+		await logScanRuleDetailCache.refresh(k);
+		// Bail if the route id changed while we were fetching — a newer load()
+		// now owns the page state; applying this stale result would clobber it.
+		if (id === null || String(id) !== k) return;
+		const entry = logScanRuleDetailCache.peek(k);
+		if (entry.error && !cached.value) {
+			error = entry.error || 'Failed to load rule';
+			loading = false;
+			return;
+		}
+		if (entry.value) {
+			rule = entry.value;
+			if (seededKey !== k) { seedForm(entry.value); resolveScopeName(entry.value, k); seededKey = k; }
+		}
+		loading = false;
 	}
 
 	async function save(e?: Event): Promise<void> {
@@ -101,6 +128,7 @@
 				enabled
 			};
 			rule = await api.updateLogScanRule(id, body);
+			logScanRuleDetailCache.set(String(id), rule);
 		} catch (e) {
 			error = e instanceof Error ? e.message : 'Save failed';
 		} finally {

web/src/routes/metric-alert-rules/+page.svelte

@@ -1,14 +1,16 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
-	import * as api from '$lib/api';
 	import type { MetricAlertRule } from '$lib/api';
+	import { metricAlertRulesCache } from '$lib/stores/caches';
 	import { IconPlus, IconRefresh } from '$lib/components/icons';
 	import ForgeHero from '$lib/components/ForgeHero.svelte';
 	import { t } from '$lib/i18n';
 
-	let rules = $state<MetricAlertRule[]>([]);
-	let loading = $state(true);
-	let error = $state('');
+	// Cache-backed (stale-while-revalidate) so revisiting this tab renders the
+	// list immediately instead of flashing the cold skeleton. See caches.ts.
+	const rules = $derived<MetricAlertRule[]>($metricAlertRulesCache.value);
+	const loading = $derived($metricAlertRulesCache.loading);
+	const error = $derived($metricAlertRulesCache.error);
 	let filter = $state<'all' | 'global' | 'workload'>('all');
 
 	const globals = $derived(rules.filter((r) => r.workload_id === ''));
@@ -26,17 +28,7 @@
 		}
 	});
 
-	async function load(): Promise<void> {
-		loading = true;
-		error = '';
-		try {
-			rules = await api.listMetricAlertRules();
-		} catch (e) {
-			error = e instanceof Error ? e.message : 'Failed to load metric alert rules';
-		} finally {
-			loading = false;
-		}
-	}
+	const load = () => metricAlertRulesCache.refresh();
 
 	function scopeLabel(r: MetricAlertRule): string {
 		if (r.workload_id !== '') {

web/src/routes/metric-alert-rules/[id]/+page.svelte

@@ -3,6 +3,7 @@
 	import { page } from '$app/stores';
 	import * as api from '$lib/api';
 	import type { MetricAlertRule, MetricAlertRuleInput } from '$lib/api';
+	import { metricAlertRuleDetailCache } from '$lib/stores/caches';
 	import ForgeHero from '$lib/components/ForgeHero.svelte';
 	import ToggleSwitch from '$lib/components/ToggleSwitch.svelte';
 	import ConfirmDialog from '$lib/components/ConfirmDialog.svelte';
@@ -51,42 +52,68 @@
 			: $t('metricalert.form.thresholdHintPercent')
 	);
 
+	function seedForm(r: MetricAlertRule): void {
+		name = r.name;
+		metric = r.metric;
+		comparator = r.comparator;
+		threshold = String(r.threshold);
+		severity = r.severity;
+		cooldownSeconds = r.cooldown_seconds;
+		enabled = r.enabled;
+	}
+
+	// Best-effort scope-label resolution (fire-and-forget); failure falls back
+	// to the truncated id. Runs once per id alongside the form seed.
+	async function resolveScopeName(r: MetricAlertRule, k: string): Promise<void> {
+		if (!r.workload_id) {
+			scopedWorkloadName = '';
+			return;
+		}
+		try {
+			const w = await api.getWorkload(r.workload_id);
+			// Ignore a late response if we've since navigated to another id.
+			if (String(id) === k) scopedWorkloadName = w.name;
+		} catch {
+			if (String(id) === k) scopedWorkloadName = '';
+		}
+	}
+
+	// Keyed warm-seed: render the cached rule instantly on revisit and seed the
+	// editable form ONCE per id (a background revalidation never re-seeds, so
+	// unsaved edits survive). Plain (non-reactive) so the $effect tracks only id.
+	let seededKey: string | null = null;
+
 	async function load(): Promise<void> {
 		if (id === null) {
 			error = 'Invalid rule id';
 			loading = false;
 			return;
 		}
-		loading = true;
-		error = '';
-		try {
-			const r = await api.getMetricAlertRule(id);
-			rule = r;
-			name = r.name;
-			metric = r.metric;
-			comparator = r.comparator;
-			threshold = String(r.threshold);
-			severity = r.severity;
-			cooldownSeconds = r.cooldown_seconds;
-			enabled = r.enabled;
-			// Best-effort: resolve the workload name for the scope
-			// label. Failure here doesn't block the rest of the page —
-			// scopeLabel falls back to the truncated id.
-			if (r.workload_id) {
-				try {
-					const w = await api.getWorkload(r.workload_id);
-					scopedWorkloadName = w.name;
-				} catch {
-					scopedWorkloadName = '';
-				}
-			} else {
-				scopedWorkloadName = '';
-			}
-		} catch (e) {
-			error = e instanceof Error ? e.message : 'Failed to load rule';
-		} finally {
+		const k = String(id);
+		const cached = metricAlertRuleDetailCache.peek(k);
+		if (cached.value) {
+			rule = cached.value;
+			if (seededKey !== k) { seedForm(cached.value); resolveScopeName(cached.value, k); seededKey = k; }
 			loading = false;
+		} else {
+			loading = true;
 		}
+		error = '';
+		await metricAlertRuleDetailCache.refresh(k);
+		// Bail if the route id changed while we were fetching — a newer load()
+		// now owns the page state; applying this stale result would clobber it.
+		if (id === null || String(id) !== k) return;
+		const entry = metricAlertRuleDetailCache.peek(k);
+		if (entry.error && !cached.value) {
+			error = entry.error || 'Failed to load rule';
+			loading = false;
+			return;
+		}
+		if (entry.value) {
+			rule = entry.value;
+			if (seededKey !== k) { seedForm(entry.value); resolveScopeName(entry.value, k); seededKey = k; }
+		}
+		loading = false;
 	}
 
 	async function save(e?: Event): Promise<void> {
@@ -105,6 +132,7 @@
 				enabled
 			};
 			rule = await api.updateMetricAlertRule(id, body);
+			metricAlertRuleDetailCache.set(String(id), rule);
 		} catch (e) {
 			error = e instanceof Error ? e.message : 'Save failed';
 		} finally {

web/src/routes/proxies/+page.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
-	import { listProxyRoutes } from '$lib/api';
+	import { get } from 'svelte/store';
 	import type { ProxyRoute, ProxyRouteSource } from '$lib/types';
+	import { proxyRoutesCache } from '$lib/stores/caches';
 	import { toasts } from '$lib/stores/toast';
 	import { t } from '$lib/i18n';
 	import Skeleton from '$lib/components/Skeleton.svelte';
@@ -10,8 +11,10 @@
 
 	type SourceFilter = 'all' | ProxyRouteSource;
 
-	let routes = $state<ProxyRoute[]>([]);
-	let loading = $state(true);
+	// Cache-backed (stale-while-revalidate) so revisiting this tab renders the
+	// routes immediately instead of flashing the cold skeleton. See caches.ts.
+	const routes = $derived<ProxyRoute[]>($proxyRoutesCache.value);
+	const loading = $derived($proxyRoutesCache.loading);
 	let search = $state('');
 	let sourceFilter = $state<SourceFilter>('all');
 
@@ -66,14 +69,11 @@
 	}
 
 	async function loadRoutes() {
-		loading = true;
-		try {
-			routes = await listProxyRoutes();
-		} catch (err) {
-			toasts.error(err instanceof Error ? err.message : $t('proxies.loadFailed'));
-		} finally {
-			loading = false;
-		}
+		await proxyRoutesCache.refresh();
+		// Cache stores the error rather than throwing; surface it as a toast to
+		// preserve the page's prior failure UX.
+		const { error } = get(proxyRoutesCache);
+		if (error) toasts.error(error || $t('proxies.loadFailed'));
 	}
 
 	$effect(() => {

web/src/routes/settings/+layout.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
 	import type { Snippet } from 'svelte';
 	import { page } from '$app/stores';
-	import { getSettings } from '$lib/api';
+	import { settingsCache } from '$lib/stores/caches';
 	import { t } from '$lib/i18n';
 	import {
 		IconSettings,
@@ -18,12 +18,14 @@
 	interface Props { children: Snippet; }
 	let { children }: Props = $props();
 
-	let proxyProvider = $state('npm');
+	// Reactive to the shared settings cache: warm on revisit so the proxy-
+	// specific sub-nav items (NPM / Traefik) render correctly on first paint
+	// instead of defaulting to npm then snapping, and it updates live when the
+	// landing page saves a provider change.
+	const proxyProvider = $derived($settingsCache.value?.proxy_provider ?? 'npm');
 
 	$effect(() => {
-		getSettings().then((s) => {
-			proxyProvider = s.proxy_provider ?? 'npm';
-		}).catch(() => {});
+		settingsCache.refresh();
 	});
 
 	type NavGroup = 'main' | 'proxy' | 'system' | 'security';

web/src/routes/settings/+page.svelte

@@ -6,7 +6,11 @@
   else — DNS, integrations, maintenance — lives on its own page now.
 -->
 <script lang="ts">
-	import { getSettings, updateSettings } from '$lib/api';
+	import { onMount } from 'svelte';
+	import { get } from 'svelte/store';
+	import { updateSettings } from '$lib/api';
+	import type { Settings } from '$lib/types';
+	import { settingsCache } from '$lib/stores/caches';
 	import FormField from '$lib/components/FormField.svelte';
 	import TimezoneSelector from '$lib/components/TimezoneSelector.svelte';
 	import Skeleton from '$lib/components/Skeleton.svelte';
@@ -77,23 +81,38 @@
 		return Object.keys(next).length === 0;
 	}
 
+	// Seed the form fields from a Settings object. Applied once on mount (from
+	// the warm cache if available, else from the network) — never re-applied
+	// during a background refresh, so it can't clobber unsaved edits.
+	function seedForm(s: Settings) {
+		domain = s.domain ?? '';
+		serverIp = s.server_ip ?? '';
+		publicIp = s.public_ip ?? '';
+		network = s.network ?? '';
+		subdomainPattern = s.subdomain_pattern ?? '';
+		pollingInterval = parseDurationToSeconds(s.polling_interval ?? '60');
+		baseVolumePath = s.base_volume_path ?? '';
+		proxyProvider = s.proxy_provider ?? 'npm';
+	}
+
 	async function loadSettings() {
-		loading = true;
-		try {
-			const s = await getSettings();
-			domain = s.domain ?? '';
-			serverIp = s.server_ip ?? '';
-			publicIp = s.public_ip ?? '';
-			network = s.network ?? '';
-			subdomainPattern = s.subdomain_pattern ?? '';
-			pollingInterval = parseDurationToSeconds(s.polling_interval ?? '60');
-			baseVolumePath = s.base_volume_path ?? '';
-			proxyProvider = s.proxy_provider ?? 'npm';
-		} catch (err) {
-			toasts.error(err instanceof Error ? err.message : $t('settingsGeneral.loadFailed'));
-		} finally {
+		// Warm cache → seed immediately and skip the skeleton (kills the
+		// entry flicker). Cold → keep the skeleton until the fetch resolves.
+		const cached = get(settingsCache).value;
+		if (cached) {
+			seedForm(cached);
 			loading = false;
 		}
+		await settingsCache.refresh();
+		const fresh = get(settingsCache).value;
+		// Only seed from the fetch when nothing was shown yet (cold load), so a
+		// background refresh never overwrites edits the user may have started.
+		if (fresh && loading) seedForm(fresh);
+		loading = false;
+		const { error } = get(settingsCache);
+		if (error && !cached) {
+			toasts.error(error || $t('settingsGeneral.loadFailed'));
+		}
 	}
 
 	async function handleSave() {
@@ -110,6 +129,11 @@
 				base_volume_path: baseVolumePath.trim(),
 				proxy_provider: proxyProvider
 			});
+			// Refetch the canonical Settings into the shared cache so the
+			// sub-layout's proxy-nav and the next visit reflect the save.
+			// (PUT /api/settings returns {status:"updated"}, not the object —
+			// so we must refresh, not set() the response.)
+			await settingsCache.refresh();
 			toasts.success($t('settingsGeneral.saved'));
 		} catch (err) {
 			toasts.error(err instanceof Error ? err.message : $t('settingsGeneral.saveFailed'));
@@ -118,7 +142,7 @@
 		}
 	}
 
-	$effect(() => { loadSettings(); });
+	onMount(loadSettings);
 </script>
 
 <svelte:head>

web/src/routes/settings/auth/+page.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
+	import { get } from 'svelte/store';
 	import { t } from '$lib/i18n';
 	import { IconLoader, IconPlus, IconTrash, IconUsers } from '$lib/components/icons';
 	import EmptyState from '$lib/components/EmptyState.svelte';
@@ -7,15 +8,14 @@
 	import Skeleton from '$lib/components/Skeleton.svelte';
 	import ConfirmDialog from '$lib/components/ConfirmDialog.svelte';
 	import {
-		getAuthSettings,
 		updateAuthSettings,
-		listUsers as apiListUsers,
 		createUser,
 		deleteUser as apiDeleteUser,
 		ApiError,
 		type AuthSettings,
 		type AuthUser
 	} from '$lib/api';
+	import { authSettingsCache, usersCache } from '$lib/stores/caches';
 
 	type User = AuthUser;
 
@@ -23,7 +23,9 @@
 	let settings = $state<AuthSettings>({
 		auth_mode: 'local', oidc_client_id: '', oidc_client_secret: '', oidc_issuer_url: '', oidc_redirect_url: ''
 	});
-	let users = $state<User[]>([]);
+	// Users list is cache-backed (stale-while-revalidate); the auth-settings
+	// form is seeded once on mount from authSettingsCache.
+	const users = $derived<User[]>($usersCache.value);
 	let saving = $state(false);
 	let message = $state('');
 	let error = $state('');
@@ -33,34 +35,32 @@
 	let newEmail = $state('');
 	let newRole = $state('viewer');
 
+	// Refresh wrapper kept so the mutation handlers below read naturally.
+	const loadUsers = () => usersCache.refresh();
+
 	onMount(async () => {
-		try {
-			await Promise.all([loadSettings(), loadUsers()]);
-		} finally {
-			loading = false;
-		}
+		// Warm-seed the auth-settings form + skip the skeleton when both caches
+		// are already populated; otherwise keep the skeleton until the fetches
+		// resolve. The form is seeded once — a background refresh never
+		// re-applies it, so unsaved edits are safe.
+		const authState = get(authSettingsCache);
+		if (authState.loaded && authState.value) settings = { ...authState.value };
+		if (authState.loaded && get(usersCache).loaded) loading = false;
+		await Promise.all([authSettingsCache.refresh(), usersCache.refresh()]);
+		const fresh = get(authSettingsCache).value;
+		if (fresh && loading) settings = { ...fresh };
+		loading = false;
+		const e = get(authSettingsCache).error || get(usersCache).error;
+		if (e && !authState.loaded) error = e;
 	});
 
-	async function loadSettings() {
-		try {
-			settings = await getAuthSettings();
-		} catch (err: unknown) {
-			error = err instanceof ApiError ? err.message : $t('settingsAuth.loadFailed');
-		}
-	}
-
-	async function loadUsers() {
-		try {
-			users = (await apiListUsers()) ?? [];
-		} catch (err: unknown) {
-			error = err instanceof ApiError ? err.message : $t('settingsAuth.loadFailed');
-		}
-	}
-
 	async function saveSettings() {
 		saving = true; message = ''; error = '';
 		try {
 			await updateAuthSettings(settings);
+			// Keep the cache fresh for the next visit without re-seeding the
+			// current form (which already reflects the just-saved values).
+			void authSettingsCache.refresh();
 			message = $t('settingsAuth.saved');
 		} catch (err: unknown) {
 			error = err instanceof ApiError ? err.message : $t('settingsAuth.saveFailed');

web/src/routes/settings/backup/+page.svelte

@@ -1,6 +1,9 @@
 <script lang="ts">
-	import { getSettings, updateSettings, listBackups, triggerBackup, deleteBackup, restoreBackup, backupDownloadUrl } from '$lib/api';
-	import type { BackupInfo } from '$lib/types';
+	import { onMount } from 'svelte';
+	import { get } from 'svelte/store';
+	import { updateSettings, triggerBackup, deleteBackup, restoreBackup, backupDownloadUrl } from '$lib/api';
+	import type { BackupInfo, Settings } from '$lib/types';
+	import { settingsCache, backupsCache } from '$lib/stores/caches';
 	import FormField from '$lib/components/FormField.svelte';
 	import ConfirmDialog from '$lib/components/ConfirmDialog.svelte';
 	import ToggleSwitch from '$lib/components/ToggleSwitch.svelte';
@@ -14,39 +17,44 @@
 	let loading = $state(true);
 	let saving = $state(false);
 	let creatingBackup = $state(false);
-	let refreshing = $state(false);
 
 	let backupEnabled = $state(false);
 	let backupIntervalHours = $state('24');
 	let backupRetentionCount = $state('10');
 	let autoBackupBeforeDeploy = $state(false);
-	let backups = $state<BackupInfo[]>([]);
+	// Backups list is cache-backed (stale-while-revalidate); the settings form
+	// fields above are seeded once on mount from the shared settingsCache.
+	const backups = $derived($backupsCache.value);
+	const refreshing = $derived($backupsCache.refreshing);
 
 	let confirmDeleteId = $state('');
 	let confirmRestoreId = $state('');
 
+	// Seed the settings-form fields once from the shared cache; never re-applied
+	// during a background refresh, so unsaved edits are safe.
+	function seedForm(s: Settings) {
+		backupEnabled = s.backup_enabled ?? false;
+		backupIntervalHours = String(s.backup_interval_hours ?? 24);
+		backupRetentionCount = String(s.backup_retention_count ?? 10);
+		autoBackupBeforeDeploy = s.auto_backup_before_deploy ?? false;
+	}
+
 	async function loadData(refresh = false) {
+		// Explicit "refresh" button only refetches the backups list.
 		if (refresh) {
-			refreshing = true;
-		} else {
-			loading = true;
-		}
-		try {
-			const [settings, backupList] = await Promise.all([
-				getSettings(),
-				listBackups()
-			]);
-			backupEnabled = settings.backup_enabled ?? false;
-			backupIntervalHours = String(settings.backup_interval_hours ?? 24);
-			backupRetentionCount = String(settings.backup_retention_count ?? 10);
-			autoBackupBeforeDeploy = settings.auto_backup_before_deploy ?? false;
-			backups = backupList ?? [];
-		} catch (err) {
-			toasts.error(err instanceof Error ? err.message : 'Failed to load backup settings');
-		} finally {
-			loading = false;
-			refreshing = false;
+			await backupsCache.refresh();
+			return;
 		}
+		// Warm caches → seed form + skip the skeleton; cold → keep skeleton.
+		const sCached = get(settingsCache).value;
+		if (sCached) seedForm(sCached);
+		if (sCached && get(backupsCache).loaded) loading = false;
+		await Promise.all([settingsCache.refresh(), backupsCache.refresh()]);
+		const fresh = get(settingsCache).value;
+		if (fresh && loading) seedForm(fresh);
+		loading = false;
+		const err = get(settingsCache).error || get(backupsCache).error;
+		if (err && !sCached) toasts.error(err || 'Failed to load backup settings');
 	}
 
 	async function handleSave() {
@@ -58,6 +66,8 @@
 				backup_retention_count: Math.max(1, parseInt(backupRetentionCount, 10) || 10),
 				auto_backup_before_deploy: autoBackupBeforeDeploy
 			});
+			// PUT returns {status:"updated"}, not Settings — refetch the cache.
+			await settingsCache.refresh();
 			toasts.success($t('settingsBackup.saved'));
 		} catch (err) {
 			toasts.error(err instanceof Error ? err.message : $t('settingsBackup.saveFailed'));
@@ -69,8 +79,8 @@
 	async function handleBackupNow() {
 		creatingBackup = true;
 		try {
-			const backup = await triggerBackup();
-			backups = [backup, ...backups];
+			await triggerBackup();
+			await backupsCache.refresh();
 			toasts.success($t('settingsBackup.backupCreated'));
 		} catch (err) {
 			toasts.error(err instanceof Error ? err.message : $t('settingsBackup.backupFailed'));
@@ -84,7 +94,7 @@
 		confirmDeleteId = '';
 		try {
 			await deleteBackup(id);
-			backups = backups.filter(b => b.id !== id);
+			await backupsCache.refresh();
 			toasts.success($t('settingsBackup.deleted'));
 		} catch (err) {
 			toasts.error(err instanceof Error ? err.message : $t('settingsBackup.deleteFailed'));
@@ -133,7 +143,7 @@
 		return /Z|[+-]\d{2}:?\d{2}$/.test(dateStr) ? dateStr : dateStr + 'Z';
 	}
 
-	$effect(() => { loadData(); });
+	onMount(() => loadData());
 </script>
 
 <svelte:head>

web/src/routes/settings/dns/+page.svelte

@@ -6,8 +6,11 @@
   connection" flow aren't buried under unrelated infra fields.
 -->
 <script lang="ts">
-	import { getSettings, updateSettings, testDnsConnection, listDnsZones } from '$lib/api';
+	import { onMount } from 'svelte';
+	import { get } from 'svelte/store';
+	import { updateSettings, testDnsConnection, listDnsZones } from '$lib/api';
 	import type { EntityPickerItem, Settings } from '$lib/types';
+	import { settingsCache } from '$lib/stores/caches';
 	import FormField from '$lib/components/FormField.svelte';
 	import EntityPicker from '$lib/components/EntityPicker.svelte';
 	import Skeleton from '$lib/components/Skeleton.svelte';
@@ -30,22 +33,28 @@
 	let zoneName = $state('');
 	let testingDns = $state(false);
 
+	// Seed once from the shared settings cache (warm → no skeleton on revisit);
+	// never re-applied during background refresh, so unsaved edits are safe.
+	function seed(s: Settings) {
+		wildcardDns = s.wildcard_dns ?? true;
+		dnsProvider = s.dns_provider ?? '';
+		hasCloudflareApiToken = s.has_cloudflare_api_token ?? false;
+		cloudflareZoneId = s.cloudflare_zone_id ?? '';
+		if (!wildcardDns && cloudflareZoneId) resolveZoneName();
+	}
+
 	async function loadSettings() {
-		loading = true;
-		try {
-			const s = await getSettings();
-			wildcardDns = s.wildcard_dns ?? true;
-			dnsProvider = s.dns_provider ?? '';
-			hasCloudflareApiToken = s.has_cloudflare_api_token ?? false;
-			cloudflareZoneId = s.cloudflare_zone_id ?? '';
-			if (!wildcardDns && cloudflareZoneId) {
-				resolveZoneName();
-			}
-		} catch (err) {
-			toasts.error(err instanceof Error ? err.message : $t('settingsGeneral.loadFailed'));
-		} finally {
+		const cached = get(settingsCache).value;
+		if (cached) {
+			seed(cached);
 			loading = false;
 		}
+		await settingsCache.refresh();
+		const fresh = get(settingsCache).value;
+		if (fresh && loading) seed(fresh);
+		loading = false;
+		const { error } = get(settingsCache);
+		if (error && !cached) toasts.error(error || $t('settingsGeneral.loadFailed'));
 	}
 
 	async function handleSave() {
@@ -58,6 +67,8 @@
 			};
 			if (cloudflareApiToken) payload.cloudflare_api_token = cloudflareApiToken;
 			await updateSettings(payload);
+			// PUT returns {status:"updated"}, not Settings — refetch the cache.
+			await settingsCache.refresh();
 			toasts.success($t('settingsGeneral.saved'));
 			cloudflareApiToken = '';
 			hasCloudflareApiToken = hasCloudflareApiToken || Boolean(payload.cloudflare_api_token);
@@ -126,7 +137,7 @@
 		}
 	}
 
-	$effect(() => { loadSettings(); });
+	onMount(loadSettings);
 </script>
 
 <svelte:head>

web/src/routes/settings/integrations/+page.svelte

@@ -8,13 +8,16 @@
   detail pages — this page deliberately does not surface them.
 -->
 <script lang="ts">
+	import { onMount } from 'svelte';
+	import { get } from 'svelte/store';
 	import {
-		getSettings, updateSettings,
+		updateSettings,
 		getSettingsNotificationSecret,
 		regenerateSettingsNotificationSecret,
 		disableSettingsNotificationSigning,
 		testSettingsNotification,
 	} from '$lib/api';
+	import { settingsCache } from '$lib/stores/caches';
 	import FormField from '$lib/components/FormField.svelte';
 	import Skeleton from '$lib/components/Skeleton.svelte';
 	import OutgoingWebhookPanel from '$lib/components/OutgoingWebhookPanel.svelte';
@@ -36,17 +39,24 @@
 		try { new URL(value.trim()); return ''; } catch { return $t('validation.invalidUrl'); }
 	}
 
+	// Seed once from the shared settings cache (warm → no skeleton on revisit);
+	// never re-applied during background refresh, so unsaved edits are safe.
 	async function load() {
-		loading = true;
-		try {
-			const settings = await getSettings();
-			notificationUrl = settings.notification_url ?? '';
+		const cached = get(settingsCache).value;
+		if (cached) {
+			notificationUrl = cached.notification_url ?? '';
 			savedNotificationUrl = notificationUrl;
-		} catch (err) {
-			toasts.error(err instanceof Error ? err.message : $t('settingsGeneral.loadFailed'));
-		} finally {
 			loading = false;
 		}
+		await settingsCache.refresh();
+		const fresh = get(settingsCache).value;
+		if (fresh && loading) {
+			notificationUrl = fresh.notification_url ?? '';
+			savedNotificationUrl = notificationUrl;
+		}
+		loading = false;
+		const { error } = get(settingsCache);
+		if (error && !cached) toasts.error(error || $t('settingsGeneral.loadFailed'));
 	}
 
 	async function handleSave() {
@@ -56,6 +66,8 @@
 		saving = true;
 		try {
 			await updateSettings({ notification_url: notificationUrl.trim() });
+			// PUT returns {status:"updated"}, not Settings — refetch the cache.
+			await settingsCache.refresh();
 			savedNotificationUrl = notificationUrl.trim();
 			toasts.success($t('settingsGeneral.saved'));
 		} catch (err) {
@@ -65,7 +77,7 @@
 		}
 	}
 
-	$effect(() => { load(); });
+	onMount(load);
 </script>
 
 <svelte:head>

web/src/routes/settings/maintenance/+page.svelte

@@ -6,7 +6,11 @@
   never within casual miss-click distance of general form fields.
 -->
 <script lang="ts">
-	import { getSettings, updateSettings, pruneImages, pruneBuildCache } from '$lib/api';
+	import { onMount } from 'svelte';
+	import { get } from 'svelte/store';
+	import { updateSettings, pruneImages, pruneBuildCache } from '$lib/api';
+	import type { Settings } from '$lib/types';
+	import { settingsCache } from '$lib/stores/caches';
 	import FormField from '$lib/components/FormField.svelte';
 	import ConfirmDialog from '$lib/components/ConfirmDialog.svelte';
 	import Skeleton from '$lib/components/Skeleton.svelte';
@@ -26,19 +30,28 @@
 	let statsIntervalSeconds = $state('15');
 	let statsRetentionHours = $state('2');
 
+	// Seed form fields once from the shared settings cache (warm → no skeleton
+	// on revisit); never re-applied during background refresh, so unsaved edits
+	// are safe. See caches.ts / settings landing page for the pattern.
+	function seed(s: Settings) {
+		staleThresholdDays = String(s.stale_threshold_days ?? 7);
+		imagePruneThresholdMb = String(s.image_prune_threshold_mb ?? 1024);
+		statsIntervalSeconds = String(s.stats_interval_seconds ?? 15);
+		statsRetentionHours = String(s.stats_retention_hours ?? 2);
+	}
+
 	async function load() {
-		loading = true;
-		try {
-			const s = await getSettings();
-			staleThresholdDays = String(s.stale_threshold_days ?? 7);
-			imagePruneThresholdMb = String(s.image_prune_threshold_mb ?? 1024);
-			statsIntervalSeconds = String(s.stats_interval_seconds ?? 15);
-			statsRetentionHours = String(s.stats_retention_hours ?? 2);
-		} catch (err) {
-			toasts.error(err instanceof Error ? err.message : $t('settingsGeneral.loadFailed'));
-		} finally {
+		const cached = get(settingsCache).value;
+		if (cached) {
+			seed(cached);
 			loading = false;
 		}
+		await settingsCache.refresh();
+		const fresh = get(settingsCache).value;
+		if (fresh && loading) seed(fresh);
+		loading = false;
+		const { error } = get(settingsCache);
+		if (error && !cached) toasts.error(error || $t('settingsGeneral.loadFailed'));
 	}
 
 	async function handleSave() {
@@ -59,6 +72,8 @@
 				stats_interval_seconds: interval,
 				stats_retention_hours: retention
 			});
+			// PUT returns {status:"updated"}, not Settings — refetch the cache.
+			await settingsCache.refresh();
 			toasts.success($t('settingsGeneral.saved'));
 		} catch (err) {
 			toasts.error(err instanceof Error ? err.message : $t('settingsGeneral.saveFailed'));
@@ -91,7 +106,7 @@
 		}
 	}
 
-	$effect(() => { load(); });
+	onMount(load);
 </script>
 
 <svelte:head>

web/src/routes/settings/npm/+page.svelte

@@ -1,6 +1,9 @@
 <script lang="ts">
-	import { getSettings, updateSettings, listNpmCertificates, listNpmAccessLists, testNpmConnection } from '$lib/api';
-	import type { EntityPickerItem } from '$lib/types';
+	import { onMount } from 'svelte';
+	import { get } from 'svelte/store';
+	import { updateSettings, listNpmCertificates, listNpmAccessLists, testNpmConnection } from '$lib/api';
+	import type { EntityPickerItem, Settings } from '$lib/types';
+	import { settingsCache } from '$lib/stores/caches';
 	import FormField from '$lib/components/FormField.svelte';
 	import ToggleSwitch from '$lib/components/ToggleSwitch.svelte';
 	import EntityPicker from '$lib/components/EntityPicker.svelte';
@@ -41,20 +44,32 @@
 		return Object.keys(newErrors).length === 0;
 	}
 
+	// Seed once from the shared settings cache (warm → no skeleton on revisit);
+	// never re-applied during background refresh, so unsaved edits are safe.
+	function seed(s: Settings) {
+		npmUrl = s.npm_url ?? '';
+		npmEmail = s.npm_email ?? '';
+		npmHasCredentials = !!(s.npm_url && s.npm_email);
+		npmPassword = '';
+		sslCertificateId = s.ssl_certificate_id ?? 0;
+		npmRemote = s.npm_remote ?? false;
+		accessListId = s.npm_access_list_id ?? 0;
+		if (sslCertificateId > 0) sslCertName = `Certificate #${sslCertificateId}`;
+		if (accessListId > 0) accessListName = `Access List #${accessListId}`;
+	}
+
 	async function loadData() {
-		loading = true;
-		try {
-			const settings = await getSettings();
-			npmUrl = settings.npm_url ?? '';
-			npmEmail = settings.npm_email ?? '';
-			npmHasCredentials = !!(settings.npm_url && settings.npm_email);
-			npmPassword = '';
-			sslCertificateId = settings.ssl_certificate_id ?? 0;
-			npmRemote = settings.npm_remote ?? false;
-			accessListId = settings.npm_access_list_id ?? 0;
-			if (sslCertificateId > 0) sslCertName = `Certificate #${sslCertificateId}`;
-			if (accessListId > 0) accessListName = `Access List #${accessListId}`;
-		} catch (err) { toasts.error(err instanceof Error ? err.message : $t('settingsCredentials.loadFailed')); } finally { loading = false; }
+		const cached = get(settingsCache).value;
+		if (cached) {
+			seed(cached);
+			loading = false;
+		}
+		await settingsCache.refresh();
+		const fresh = get(settingsCache).value;
+		if (fresh && loading) seed(fresh);
+		loading = false;
+		const { error } = get(settingsCache);
+		if (error && !cached) toasts.error(error || $t('settingsCredentials.loadFailed'));
 	}
 
 	async function handleTestConnection() {
@@ -91,6 +106,7 @@
 			const payload: Record<string, unknown> = { npm_url: npmUrl.trim(), npm_email: npmEmail.trim(), npm_remote: npmRemote };
 			if (npmPassword.trim()) payload.npm_password = npmPassword.trim();
 			await updateSettings(payload);
+			await settingsCache.refresh();
 			npmHasCredentials = true;
 			editingNpm = false;
 			npmPassword = '';
@@ -117,7 +133,7 @@
 	}
 
 	async function saveCertificate(id: number) {
-		try { await updateSettings({ ssl_certificate_id: id }); toasts.success($t('settingsCredentials.saved')); }
+		try { await updateSettings({ ssl_certificate_id: id }); await settingsCache.refresh(); toasts.success($t('settingsCredentials.saved')); }
 		catch (err) { toasts.error(err instanceof Error ? err.message : $t('settingsCredentials.saveFailed')); }
 	}
 
@@ -148,7 +164,7 @@
 	}
 
 	async function saveAccessList(id: number) {
-		try { await updateSettings({ npm_access_list_id: id }); toasts.success($t('settingsCredentials.saved')); }
+		try { await updateSettings({ npm_access_list_id: id }); await settingsCache.refresh(); toasts.success($t('settingsCredentials.saved')); }
 		catch (err) { toasts.error(err instanceof Error ? err.message : $t('settingsCredentials.saveFailed')); }
 	}
 
@@ -183,6 +199,7 @@
 	async function handleNpmRemoteChange() {
 		try {
 			await updateSettings({ npm_remote: npmRemote });
+			await settingsCache.refresh();
 			toasts.success($t('settingsCredentials.saved'));
 		} catch (err) {
 			toasts.error(err instanceof Error ? err.message : $t('settingsCredentials.saveFailed'));
@@ -193,7 +210,7 @@
 		await loadData();
 		await Promise.all([resolveCertName(), resolveAccessListName()]);
 	}
-	$effect(() => { init(); });
+	onMount(init);
 </script>
 
 <svelte:head>

web/src/routes/settings/registries/+page.svelte

@@ -1,6 +1,9 @@
 <script lang="ts">
-	import { listRegistries, createRegistry, updateRegistry, deleteRegistry, testRegistry } from '$lib/api';
+	import { onMount } from 'svelte';
+	import { get } from 'svelte/store';
+	import { createRegistry, updateRegistry, deleteRegistry, testRegistry } from '$lib/api';
 	import type { Registry } from '$lib/types';
+	import { registriesCache } from '$lib/stores/caches';
 	import FormField from '$lib/components/FormField.svelte';
 	import EmptyState from '$lib/components/EmptyState.svelte';
 	import Skeleton from '$lib/components/Skeleton.svelte';
@@ -9,8 +12,10 @@
 	import { IconPlus, IconLoader, IconEdit, IconTrash, IconWifi } from '$lib/components/icons';
 	import ConfirmDialog from '$lib/components/ConfirmDialog.svelte';
 
-	let registries = $state<Registry[]>([]);
-	let loading = $state(true);
+	// Cache-backed (stale-while-revalidate) so revisiting this tab renders the
+	// registry list immediately instead of flashing the cold skeleton.
+	const registries = $derived($registriesCache.value);
+	const loading = $derived($registriesCache.loading);
 
 	let showForm = $state(false);
 	let editingId = $state<string | null>(null);
@@ -39,12 +44,11 @@
 	function startEdit(registry: Registry) { editingId = registry.id; formName = registry.name; formUrl = registry.url; formType = registry.type; formToken = ''; formOwner = registry.owner ?? ''; showForm = true; errors = {}; }
 
 	async function loadRegistryList() {
-		loading = true;
-		try {
-			registries = await listRegistries();
-			// Check health of all registries in the background.
-			checkAllHealth();
-		} catch (err) { toasts.error(err instanceof Error ? err.message : $t('settingsRegistries.loadFailed')); } finally { loading = false; }
+		await registriesCache.refresh();
+		const { error } = get(registriesCache);
+		if (error) { toasts.error(error || $t('settingsRegistries.loadFailed')); return; }
+		// Check health of all registries in the background.
+		checkAllHealth();
 	}
 
 	async function handleSave() {
@@ -78,7 +82,7 @@
 	}
 
 	async function checkAllHealth() {
-		const checks = registries.map(async (reg) => {
+		const checks = get(registriesCache).value.map(async (reg) => {
 			healthStatus[reg.id] = 'checking';
 			try {
 				await testRegistry(reg.id);
@@ -90,7 +94,7 @@
 		await Promise.allSettled(checks);
 	}
 
-	$effect(() => { loadRegistryList(); });
+	onMount(loadRegistryList);
 </script>
 
 <svelte:head>

web/src/routes/settings/traefik/+page.svelte

@@ -1,5 +1,9 @@
 <script lang="ts">
-	import { getSettings, updateSettings } from '$lib/api';
+	import { onMount } from 'svelte';
+	import { get } from 'svelte/store';
+	import { updateSettings } from '$lib/api';
+	import type { Settings } from '$lib/types';
+	import { settingsCache } from '$lib/stores/caches';
 	import FormField from '$lib/components/FormField.svelte';
 	import Skeleton from '$lib/components/Skeleton.svelte';
 	import { toasts } from '$lib/stores/toast';
@@ -14,17 +18,28 @@
 	let traefikNetwork = $state('');
 	let traefikApiUrl = $state('');
 
+	// Seed form fields once from the shared settings cache (warm → no skeleton
+	// on revisit); never re-applied during background refresh, so unsaved edits
+	// are safe. See caches.ts / settings landing page for the pattern.
+	function seed(s: Settings) {
+		traefikEntrypoint = s.traefik_entrypoint ?? 'websecure';
+		traefikCertResolver = s.traefik_cert_resolver ?? 'letsencrypt';
+		traefikNetwork = s.traefik_network ?? '';
+		traefikApiUrl = s.traefik_api_url ?? '';
+	}
+
 	async function loadData() {
-		loading = true;
-		try {
-			const settings = await getSettings();
-			traefikEntrypoint = settings.traefik_entrypoint ?? 'websecure';
-			traefikCertResolver = settings.traefik_cert_resolver ?? 'letsencrypt';
-			traefikNetwork = settings.traefik_network ?? '';
-			traefikApiUrl = settings.traefik_api_url ?? '';
-		} catch (err) {
-			toasts.error(err instanceof Error ? err.message : $t('settingsGeneral.loadFailed'));
-		} finally { loading = false; }
+		const cached = get(settingsCache).value;
+		if (cached) {
+			seed(cached);
+			loading = false;
+		}
+		await settingsCache.refresh();
+		const fresh = get(settingsCache).value;
+		if (fresh && loading) seed(fresh);
+		loading = false;
+		const { error } = get(settingsCache);
+		if (error && !cached) toasts.error(error || $t('settingsGeneral.loadFailed'));
 	}
 
 	async function handleSave() {
@@ -36,13 +51,15 @@
 				traefik_network: traefikNetwork.trim(),
 				traefik_api_url: traefikApiUrl.trim()
 			});
+			// PUT returns {status:"updated"}, not Settings — refetch the cache.
+			await settingsCache.refresh();
 			toasts.success($t('settingsGeneral.saved'));
 		} catch (err) {
 			toasts.error(err instanceof Error ? err.message : $t('settingsGeneral.saveFailed'));
 		} finally { saving = false; }
 	}
 
-	$effect(() => { loadData(); });
+	onMount(loadData);
 </script>
 
 <svelte:head>

web/src/routes/shared-secrets/+page.svelte

@@ -1,16 +1,18 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
-	import * as api from '$lib/api';
 	import type { SharedSecret } from '$lib/api';
-	import type { App } from '$lib/types';
+	import { sharedSecretsCache } from '$lib/stores/caches';
 	import { IconPlus, IconRefresh } from '$lib/components/icons';
 	import ForgeHero from '$lib/components/ForgeHero.svelte';
 	import { t } from '$lib/i18n';
 
-	let secrets = $state<SharedSecret[]>([]);
-	let apps = $state<App[]>([]);
-	let loading = $state(true);
-	let error = $state('');
+	// Cache-backed (stale-while-revalidate) so revisiting this tab renders the
+	// list immediately instead of flashing the cold skeleton. Apps are loaded
+	// alongside secrets (non-fatal) to resolve app-scoped row names. See caches.ts.
+	const secrets = $derived<SharedSecret[]>($sharedSecretsCache.value.secrets);
+	const apps = $derived($sharedSecretsCache.value.apps);
+	const loading = $derived($sharedSecretsCache.loading);
+	const error = $derived($sharedSecretsCache.error);
 	let filter = $state<'all' | 'global' | 'app'>('all');
 
 	const globals = $derived(secrets.filter((s) => s.scope === 'global'));
@@ -37,25 +39,7 @@
 		}
 	});
 
-	async function load(): Promise<void> {
-		loading = true;
-		error = '';
-		try {
-			// Load apps alongside secrets so app-scoped rows resolve their
-			// name. App load failure is non-fatal — the row falls back to
-			// the truncated id.
-			const [s, a] = await Promise.all([
-				api.listSharedSecrets(),
-				api.listApps().catch(() => [] as App[])
-			]);
-			secrets = s;
-			apps = a;
-		} catch (e) {
-			error = e instanceof Error ? e.message : 'Failed to load shared secrets';
-		} finally {
-			loading = false;
-		}
-	}
+	const load = () => sharedSecretsCache.refresh();
 
 	function scopeLabel(s: SharedSecret): string {
 		if (s.scope === 'app') {

web/src/routes/shared-secrets/[id]/+page.svelte

@@ -5,6 +5,7 @@
 	import * as api from '$lib/api';
 	import type { SharedSecret, SharedSecretInput } from '$lib/api';
 	import type { EntityPickerItem, App } from '$lib/types';
+	import { sharedSecretDetailCache } from '$lib/stores/caches';
 	import ForgeHero from '$lib/components/ForgeHero.svelte';
 	import ToggleSwitch from '$lib/components/ToggleSwitch.svelte';
 	import EntityPicker from '$lib/components/EntityPicker.svelte';
@@ -79,37 +80,58 @@
 		appID = '';
 	}
 
+	function seedForm(s: SharedSecret): void {
+		name = s.name;
+		// value intentionally NOT populated — write-only.
+		value = '';
+		encrypted = s.encrypted;
+		loadedEncrypted = s.encrypted;
+		scope = s.scope;
+		appID = s.app_id;
+		description = s.description;
+		enabled = s.enabled;
+	}
+
+	// Keyed warm-seed: render the cached secret metadata instantly on revisit
+	// and seed the editable form ONCE per id (a background revalidation never
+	// re-seeds, so unsaved edits survive). The cached object carries no
+	// plaintext value (the API returns only `has_value`). Plain (non-reactive)
+	// guard. Apps (for the picker) are best-effort and loaded each visit.
+	let seededKey: string | null = null;
+
 	async function load(): Promise<void> {
 		if (id === '') {
 			error = 'Invalid secret id';
 			loading = false;
 			return;
 		}
-		loading = true;
-		error = '';
-		try {
-			// Load apps alongside the secret so the scope chip + picker
-			// resolve names. App load failure is non-fatal.
-			const [s, a] = await Promise.all([
-				api.getSharedSecret(id),
-				api.listApps().catch(() => [] as App[])
-			]);
-			secret = s;
-			name = s.name;
-			// value intentionally NOT populated — write-only.
-			value = '';
-			encrypted = s.encrypted;
-			loadedEncrypted = s.encrypted;
-			scope = s.scope;
-			appID = s.app_id;
-			description = s.description;
-			enabled = s.enabled;
-			apps = a;
-		} catch (e) {
-			error = e instanceof Error ? e.message : 'Failed to load secret';
-		} finally {
+		const k = id;
+		const cached = sharedSecretDetailCache.peek(k);
+		if (cached.value) {
+			secret = cached.value;
+			if (seededKey !== k) { seedForm(cached.value); seededKey = k; }
 			loading = false;
+		} else {
+			loading = true;
 		}
+		error = '';
+		const appsPromise = api.listApps().catch(() => [] as App[]);
+		await sharedSecretDetailCache.refresh(k);
+		apps = await appsPromise;
+		// Bail if the route id changed while we were fetching — a newer load()
+		// now owns the page state; applying this stale result would clobber it.
+		if (id !== k) return;
+		const entry = sharedSecretDetailCache.peek(k);
+		if (entry.error && !cached.value) {
+			error = entry.error || 'Failed to load secret';
+			loading = false;
+			return;
+		}
+		if (entry.value) {
+			secret = entry.value;
+			if (seededKey !== k) { seedForm(entry.value); seededKey = k; }
+		}
+		loading = false;
 	}
 
 	async function save(e?: Event): Promise<void> {
@@ -130,6 +152,7 @@
 			// include it only when the operator typed a new one (rotate).
 			if (value !== '') body.value = value;
 			secret = await api.updateSharedSecret(id, body);
+			sharedSecretDetailCache.set(id, secret);
 			// Re-baseline after a successful save: the new encrypted flag
 			// is now the loaded state, and the value field clears so a
 			// stale rotation can't be re-submitted.

web/src/routes/triggers/+page.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
-	import * as api from '$lib/api';
 	import type { RedeployTrigger } from '$lib/api';
+	import { triggersCache } from '$lib/stores/caches';
 	import { IconPlus, IconRefresh } from '$lib/components/icons';
 	import ForgeHero from '$lib/components/ForgeHero.svelte';
 	import { t } from '$lib/i18n';
@@ -13,9 +13,11 @@
 	const KNOWN_KINDS = ['registry', 'git', 'manual', 'schedule', 'webhook', 'logscan'] as const;
 	type KnownKind = (typeof KNOWN_KINDS)[number];
 
-	let triggers = $state<RedeployTrigger[]>([]);
-	let loading = $state(true);
-	let error = $state('');
+	// Cache-backed (stale-while-revalidate) so revisiting this tab renders the
+	// list immediately instead of flashing the cold skeleton. See caches.ts.
+	const triggers = $derived<RedeployTrigger[]>($triggersCache.value);
+	const loading = $derived($triggersCache.loading);
+	const error = $derived($triggersCache.error);
 	let kindFilter = $state<'all' | KnownKind | string>('all');
 
 	const filtered = $derived(
@@ -69,17 +71,7 @@
 		}
 	}
 
-	async function load(): Promise<void> {
-		loading = true;
-		error = '';
-		try {
-			triggers = await api.listTriggers();
-		} catch (e) {
-			error = e instanceof Error ? e.message : 'Failed to load triggers';
-		} finally {
-			loading = false;
-		}
-	}
+	const load = () => triggersCache.refresh();
 
 	onMount(load);
 </script>