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

package.json

@@ -59,6 +59,7 @@
 		"@node-rs/argon2": "^2.0.2",
 		"@sveltejs/adapter-vercel": "^5.10.2",
 		"arctic": "^3.7.0",
+		"lucide-svelte": "^0.553.0",
 		"nanoid": "^5.1.6",
 		"postgres": "^3.4.5",
 		"sharp": "^0.34.4",