fix:push notification UI, settings and API

Introduce NotificationManager, NotificationPrompt, NotificationSettings,
NotificationSettingsSheet and integrate into the profile panel. Add
server GET/POST endpoints for notification preferences. Add
lucide-svelte dependency and update CSP connect-src to allow
fcm.googleapis.com and android.googleapis.com

src/routes/api/notifications/preferences/+server.ts

@@ -0,0 +1,93 @@
+import { json, error } from '@sveltejs/kit';
+import type { RequestHandler } from './$types';
+import { db } from '$lib/server/db';
+import { notificationPreferences } from '$lib/server/db/schema';
+import { eq } from 'drizzle-orm';
+
+// GET - Fetch user's notification preferences
+export const GET: RequestHandler = async ({ locals }) => {
+	if (!locals.user) {
+		throw error(401, 'Unauthorized');
+	}
+
+	try {
+		// Get user's preferences
+		const [preferences] = await db
+			.select()
+			.from(notificationPreferences)
+			.where(eq(notificationPreferences.userId, locals.user.id))
+			.limit(1);
+
+		// If no preferences exist, return defaults
+		if (!preferences) {
+			return json({
+				friendRequests: true,
+				friendAccepted: true,
+				findLiked: true,
+				findCommented: true,
+				pushEnabled: true
+			});
+		}
+
+		return json({
+			friendRequests: preferences.friendRequests,
+			friendAccepted: preferences.friendAccepted,
+			findLiked: preferences.findLiked,
+			findCommented: preferences.findCommented,
+			pushEnabled: preferences.pushEnabled
+		});
+	} catch (err) {
+		console.error('Error fetching notification preferences:', err);
+		throw error(500, 'Failed to fetch notification preferences');
+	}
+};
+
+// POST - Update user's notification preferences
+export const POST: RequestHandler = async ({ locals, request }) => {
+	if (!locals.user) {
+		throw error(401, 'Unauthorized');
+	}
+
+	try {
+		const body = await request.json();
+		const { friendRequests, friendAccepted, findLiked, findCommented, pushEnabled } = body;
+
+		// Validate boolean values
+		const preferences = {
+			friendRequests: typeof friendRequests === 'boolean' ? friendRequests : true,
+			friendAccepted: typeof friendAccepted === 'boolean' ? friendAccepted : true,
+			findLiked: typeof findLiked === 'boolean' ? findLiked : true,
+			findCommented: typeof findCommented === 'boolean' ? findCommented : true,
+			pushEnabled: typeof pushEnabled === 'boolean' ? pushEnabled : true
+		};
+
+		// Check if preferences exist
+		const [existing] = await db
+			.select()
+			.from(notificationPreferences)
+			.where(eq(notificationPreferences.userId, locals.user.id))
+			.limit(1);
+
+		if (existing) {
+			// Update existing preferences
+			await db
+				.update(notificationPreferences)
+				.set({
+					...preferences,
+					updatedAt: new Date()
+				})
+				.where(eq(notificationPreferences.userId, locals.user.id));
+		} else {
+			// Create new preferences
+			await db.insert(notificationPreferences).values({
+				userId: locals.user.id,
+				...preferences
+			});
+		}
+
+		return json({ success: true, preferences });
+	} catch (err) {
+		console.error('Error updating notification preferences:', err);
+		throw error(500, 'Failed to update notification preferences');
+	}
+};