feat: locale-aware notification templates + UX improvements

- Add locale support to notification templates (matching command template
  pattern): TemplateSlot now has locale field with (config_id, slot_name,
  locale) uniqueness, nested API format {slot: {locale: template}}
- Migration merges separate EN/RU system configs into unified per-provider
  configs; seeds create one config per provider with multi-locale slots
- Locale-aware dispatch with EN fallback in NotificationDispatcher
- Frontend locale tabs (EN/RU) on template config editor
- Fix tracking config cards not showing default provider icons
- Global provider filter, search palette, and various UX polish

frontend/src/lib/components/EntitySelect.svelte

@@ -180,7 +180,7 @@
 		align-items: center;
 		gap: 0.5rem;
 		width: 100%;
-		padding: 0.5rem 0.75rem;
+		padding: 0.375rem 0.75rem;
 		border: 1px solid var(--color-border);
 		border-radius: 0.375rem;
 		font-size: 0.875rem;

frontend/src/lib/components/SearchPalette.svelte

@@ -3,6 +3,8 @@
 	import { t } from '$lib/i18n';
 	import MdiIcon from './MdiIcon.svelte';
 	import { requestHighlight } from '$lib/highlight';
+	import { providerDefaultIcon } from '$lib/grid-items';
+	import { globalProviderFilter } from '$lib/stores/provider-filter.svelte';
 	import {
 		fetchAllCaches,
 		providersCache,
@@ -44,7 +46,7 @@
 
 	const GROUPS: readonly { key: string; label: string; icon: string; href: string; mapFn: (e: CacheEntity) => { detail: string; icon: string } }[] = [
 		{ key: 'providers', label: 'nav.providers', icon: 'mdiServer', href: '/providers',
-			mapFn: (e) => ({ detail: String(e.type || ''), icon: String(e.icon || 'mdiServer') }) },
+			mapFn: (e) => ({ detail: String(e.type || ''), icon: providerDefaultIcon(e as any) }) },
 		{ key: 'notification_trackers', label: 'nav.notification', icon: 'mdiRadar', href: '/notification-trackers',
 			mapFn: (e) => ({ detail: e.enabled ? 'enabled' : 'disabled', icon: String(e.icon || 'mdiRadar') }) },
 		{ key: 'tracking_configs', label: 'nav.trackingConfigs', icon: 'mdiCog', href: '/tracking-configs',
@@ -87,10 +89,20 @@
 		const terms = query.toLowerCase().split(/\s+/).filter(Boolean);
 		const all: SearchResult[] = [];
 
+		const gpid = globalProviderFilter.id;
+		const gpt = globalProviderFilter.providerType;
+		const providerScoped = new Set(['notification_trackers', 'command_trackers', 'actions']);
+		const typeScoped = new Set(['tracking_configs', 'template_configs', 'command_configs', 'command_template_configs']);
+
 		for (const group of GROUPS) {
 			const cache = cacheMap[group.key];
 			if (!cache) continue;
 			for (const entity of cache.items) {
+				// Apply global provider filter
+				if (gpid && group.key === 'providers' && entity.id !== gpid) continue;
+				if (gpid && providerScoped.has(group.key) && (entity as any).provider_id !== gpid) continue;
+				if (gpt && typeScoped.has(group.key) && (entity as any).provider_type !== gpt) continue;
+
 				const mapped = group.mapFn(entity);
 				const name = entity.name || '';
 				const searchable = `${name} ${mapped.detail} ${t(group.label)}`.toLowerCase();

frontend/src/lib/grid-items.ts

@@ -6,6 +6,21 @@
 import { t } from '$lib/i18n';
 import type { GridItem } from '$lib/components/IconGridSelect.svelte';
 
+/** Default icon for each provider type. Use instead of hardcoded 'mdiServer'. */
+const PROVIDER_TYPE_ICONS: Record<string, string> = {
+	immich: 'mdiImageMultiple',
+	gitea: 'mdiGit',
+	planka: 'mdiViewDashboard',
+	scheduler: 'mdiClockOutline',
+};
+
+/** Get the default icon for a provider, falling back by type then generic. */
+export function providerDefaultIcon(provider: { icon?: string; type?: string }): string {
+	if (provider.icon) return provider.icon;
+	if (provider.type && PROVIDER_TYPE_ICONS[provider.type]) return PROVIDER_TYPE_ICONS[provider.type];
+	return 'mdiServer';
+}
+
 // --- Sort ---
 
 export const sortByItems = (): GridItem[] => [
@@ -108,8 +123,8 @@ export const providerTypeFilterItems = (): GridItem[] => [
 // --- Provider type ---
 
 export const providerTypeItems = (): GridItem[] => [
-	{ value: 'immich', icon: 'mdiCamera', label: t('providers.typeImmich'), desc: t('gridDesc.providerImmich') },
-	{ value: 'gitea', icon: 'mdiGit', label: t('providers.typeGitea'), desc: t('gridDesc.providerGitea') },
-	{ value: 'planka', icon: 'mdiViewDashboard', label: t('providers.typePlanka'), desc: t('gridDesc.providerPlanka') },
-	{ value: 'scheduler', icon: 'mdiClockOutline', label: t('providers.typeScheduler'), desc: t('gridDesc.providerScheduler') },
+	{ value: 'immich', icon: PROVIDER_TYPE_ICONS.immich, label: t('providers.typeImmich'), desc: t('gridDesc.providerImmich') },
+	{ value: 'gitea', icon: PROVIDER_TYPE_ICONS.gitea, label: t('providers.typeGitea'), desc: t('gridDesc.providerGitea') },
+	{ value: 'planka', icon: PROVIDER_TYPE_ICONS.planka, label: t('providers.typePlanka'), desc: t('gridDesc.providerPlanka') },
+	{ value: 'scheduler', icon: PROVIDER_TYPE_ICONS.scheduler, label: t('providers.typeScheduler'), desc: t('gridDesc.providerScheduler') },
 ];

frontend/src/lib/i18n/en.json

@@ -335,6 +335,11 @@
 		"clickToCopy": "Click to copy chat ID",
 		"chatsDiscovered": "Chats discovered",
 		"chatDeleted": "Chat removed",
+		"chatName": "Name",
+		"chatType": "Type",
+		"chatLang": "Lang",
+		"chatId": "Chat ID",
+		"languageUpdated": "Chat language updated",
 		"cmdLocale": "Bot language",
 		"searchCooldown": "Search cooldown (s)",
 		"saveConfig": "Save config",

frontend/src/lib/i18n/ru.json

@@ -335,6 +335,11 @@
 		"clickToCopy": "Нажмите, чтобы скопировать ID чата",
 		"chatsDiscovered": "Чаты обнаружены",
 		"chatDeleted": "Чат удалён",
+		"chatName": "Имя",
+		"chatType": "Тип",
+		"chatLang": "Язык",
+		"chatId": "ID чата",
+		"languageUpdated": "Язык чата обновлён",
 		"cmdLocale": "Язык бота",
 		"searchCooldown": "Кулдаун поиска (с)",
 		"saveConfig": "Сохранить настройки",

frontend/src/lib/stores/provider-filter.svelte.ts

@@ -0,0 +1,57 @@
+/**
+ * Global provider filter — persisted to localStorage.
+ *
+ * When set, pages should filter entities to show only those
+ * belonging to the selected provider. null = show all.
+ */
+
+import { providersCache } from './caches.svelte';
+
+const STORAGE_KEY = 'global_provider_id';
+
+let _providerId = $state<number | null>(null);
+let _initialized = $state(false);
+
+function loadFromStorage(): void {
+	if (typeof localStorage === 'undefined') return;
+	const stored = localStorage.getItem(STORAGE_KEY);
+	if (stored) {
+		const parsed = parseInt(stored, 10);
+		_providerId = isNaN(parsed) ? null : parsed;
+	}
+	_initialized = true;
+}
+
+// Load on module init
+loadFromStorage();
+
+export const globalProviderFilter = {
+	get id() { return _providerId; },
+	get initialized() { return _initialized; },
+
+	set(id: number | null) {
+		_providerId = id;
+		if (typeof localStorage !== 'undefined') {
+			if (id != null) {
+				localStorage.setItem(STORAGE_KEY, String(id));
+			} else {
+				localStorage.removeItem(STORAGE_KEY);
+			}
+		}
+	},
+
+	clear() {
+		this.set(null);
+	},
+
+	/** The currently selected provider object (reactive). */
+	get provider() {
+		if (_providerId == null) return null;
+		return providersCache.items.find(p => p.id === _providerId) ?? null;
+	},
+
+	/** The provider type string, or null. */
+	get providerType() {
+		return this.provider?.type ?? null;
+	},
+};

frontend/src/lib/types.ts

@@ -156,7 +156,7 @@ export interface TemplateConfig {
 	name: string;
 	description: string;
 	icon: string;
-	slots: Record<string, string>;
+	slots: Record<string, Record<string, string>>;
 	date_format: string;
 	date_only_format: string;
 	created_at: string;