feat: IconGridSelect, CrossLink, SearchPalette components + entity crosslinks

New components:
- IconGridSelect: Visual grid selector replacing <select> dropdowns,
  with icon + label cells, fixed-position popup, smart placement
- CrossLink: Inline clickable badge for cross-entity navigation,
  hover highlights primary, used on entity cards
- SearchPalette: Ctrl+K global command palette, searches all entity
  types via cached data, grouped results, keyboard navigation

Integration:
- Targets: type selector uses IconGridSelect (4-column grid with icons)
- Targets: bot crosslink on telegram/email/matrix target cards
- Command Trackers: provider and config badges → CrossLinks
- Command Trackers: listener bot name → CrossLink
- Command Configs: template config shown as CrossLink on card
- Notification Trackers: provider CrossLink added to card
- Layout: SearchPalette mounted globally

Infrastructure:
- Added CommandConfig, CommandTemplateConfig, CommandTracker types
- Added notificationTrackersCache, commandTrackersCache to caches
- Added allCaches map and fetchAllCaches() for search palette
- Added searchPalette i18n keys (EN/RU)

frontend/src/lib/stores/caches.svelte.ts

@@ -9,11 +9,15 @@ import { createEntityCache } from './entity-cache.svelte';
 import type {
 	ServiceProvider,
 	NotificationTarget,
+	Tracker,
 	TrackingConfig,
 	TemplateConfig,
 	TelegramBot,
 	EmailBot,
 	MatrixBot,
+	CommandConfig,
+	CommandTemplateConfig,
+	CommandTracker,
 } from '$lib/types';
 
 /** Service providers — used by Dashboard, Trackers, Command Trackers, Providers page. */
@@ -22,6 +26,9 @@ export const providersCache = createEntityCache<ServiceProvider>('/providers');
 /** Notification targets — used by Trackers, Targets page. */
 export const targetsCache = createEntityCache<NotificationTarget>('/targets');
 
+/** Notification trackers — used by Dashboard, Trackers page. */
+export const notificationTrackersCache = createEntityCache<Tracker>('/notification-trackers');
+
 /** Tracking configs — used by Trackers, Tracking Configs page. */
 export const trackingConfigsCache = createEntityCache<TrackingConfig>('/tracking-configs');
 
@@ -37,23 +44,42 @@ export const emailBotsCache = createEntityCache<EmailBot>('/email-bots');
 /** Matrix bots — used by Targets, Bots page. */
 export const matrixBotsCache = createEntityCache<MatrixBot>('/matrix-bots');
 
-// Command-specific caches (less shared but still benefit from caching)
+/** Command configs — used by Command Trackers, Command Configs page. */
+export const commandConfigsCache = createEntityCache<CommandConfig>('/command-configs');
 
-export const commandConfigsCache = createEntityCache<any>('/command-configs');
+/** Command template configs — used by Command Configs, Command Template Configs page. */
+export const commandTemplateConfigsCache = createEntityCache<CommandTemplateConfig>('/command-template-configs');
 
-export const commandTemplateConfigsCache = createEntityCache<any>('/command-template-configs');
+/** Command trackers — used by Command Trackers page. */
+export const commandTrackersCache = createEntityCache<CommandTracker>('/command-trackers');
+
+/**
+ * All caches keyed by entity type — for search palette and crosslink resolution.
+ */
+export const allCaches = {
+	providers: providersCache,
+	targets: targetsCache,
+	notification_trackers: notificationTrackersCache,
+	tracking_configs: trackingConfigsCache,
+	template_configs: templateConfigsCache,
+	telegram_bots: telegramBotsCache,
+	email_bots: emailBotsCache,
+	matrix_bots: matrixBotsCache,
+	command_configs: commandConfigsCache,
+	command_template_configs: commandTemplateConfigsCache,
+	command_trackers: commandTrackersCache,
+} as const;
+
+/**
+ * Fetch all caches in parallel. Used by search palette.
+ */
+export async function fetchAllCaches(): Promise<void> {
+	await Promise.all(Object.values(allCaches).map(c => c.fetch()));
+}
 
 /**
  * Invalidate all entity caches. Useful on logout.
  */
 export function clearAllCaches(): void {
-	providersCache.clear();
-	targetsCache.clear();
-	trackingConfigsCache.clear();
-	templateConfigsCache.clear();
-	telegramBotsCache.clear();
-	emailBotsCache.clear();
-	matrixBotsCache.clear();
-	commandConfigsCache.clear();
-	commandTemplateConfigsCache.clear();
+	Object.values(allCaches).forEach(c => c.clear());
 }