feat: Reduce memory footprint for PGlite, Implement user-specific Electric SQL database management

- Added cleanup logic for other users' databases on login to ensure data isolation.
- Introduced best-effort cleanup on logout to remove stale databases.
- Updated Electric client initialization to support user-specific databases.
- Refactored hooks to utilize the Electric context for better state management and prevent race conditions.
- Enhanced error handling and logging for Electric SQL operations.

surfsense_web/components/layout/providers/LayoutDataProvider.tsx

@@ -21,6 +21,7 @@ import {
 } from "@/components/ui/dialog";
 import { searchSpacesApiService } from "@/lib/apis/search-spaces-api.service";
 import { deleteThread, fetchThreads } from "@/lib/chat/thread-persistence";
+import { cleanupElectric } from "@/lib/electric/client";
 import { resetUser, trackLogout } from "@/lib/posthog/events";
 import { cacheKeys } from "@/lib/query-client/cache-keys";
 import type { ChatItem, NavItem, SearchSpace } from "../types/layout.types";
@@ -278,10 +279,19 @@ export function LayoutDataProvider({
 		router.push(`/dashboard/${searchSpaceId}/team`);
 	}, [router, searchSpaceId]);
 
-	const handleLogout = useCallback(() => {
+	const handleLogout = useCallback(async () => {
 		try {
 			trackLogout();
 			resetUser();
+
+			// Best-effort cleanup of Electric SQL / PGlite
+			// Even if this fails, login-time cleanup will handle it
+			try {
+				await cleanupElectric();
+			} catch (err) {
+				console.warn("[Logout] Electric cleanup failed (will be handled on next login):", err);
+			}
+
 			if (typeof window !== "undefined") {
 				localStorage.removeItem("surfsense_bearer_token");
 				router.push("/");