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/lib/electric/context.ts

@@ -0,0 +1,37 @@
+"use client";
+
+import { createContext, useContext } from "react";
+import type { ElectricClient } from "./client";
+
+/**
+ * Context for sharing the Electric SQL client across the app
+ * 
+ * This ensures:
+ * 1. Single initialization point (ElectricProvider only)
+ * 2. No race conditions (hooks wait for context)
+ * 3. Clean cleanup (ElectricProvider manages lifecycle)
+ */
+export const ElectricContext = createContext<ElectricClient | null>(null);
+
+/**
+ * Hook to get the Electric client from context
+ * Returns null if Electric is not initialized yet
+ */
+export function useElectricClient(): ElectricClient | null {
+	return useContext(ElectricContext);
+}
+
+/**
+ * Hook to get the Electric client, throwing if not available
+ * Use this when you're sure Electric should be initialized
+ */
+export function useElectricClientOrThrow(): ElectricClient {
+	const client = useContext(ElectricContext);
+	if (!client) {
+		throw new Error(
+			"Electric client not available. Make sure you're inside ElectricProvider and user is authenticated."
+		);
+	}
+	return client;
+}
+