feat: redesign notifications settings with per-category in-app/push table

- Add notify_new_chapters_push field to AppUser, PATCH /api/profile, and profile loader
- Fix bell panel to reload notifications on every open (not just once on mount)
- Replace flat in-app + push toggles with structured category table (Category | In-app | Push)
- Add browser push master subscribe/unsubscribe row above the table
- Push column toggle disabled until browser is subscribed; shows — when unsupported/denied
- Update Notifications row hint to summarise active channels (In-app · Push / Off)

ui/src/lib/server/pocketbase.ts

@@ -96,6 +96,7 @@ export interface User {
 	polar_customer_id?: string;
 	polar_subscription_id?: string;
 	notify_new_chapters?: boolean;
+	notify_new_chapters_push?: boolean;
 }
 
 // ─── Auth token cache ─────────────────────────────────────────────────────────
@@ -1582,7 +1583,10 @@ export async function updateUserAvatarUrl(userId: string, avatarUrl: string): Pr
  */
 export async function updateUserNotificationPrefs(
 	userId: string,
-	prefs: { notify_new_chapters?: boolean }
+	prefs: {
+		notify_new_chapters?: boolean;
+		notify_new_chapters_push?: boolean;
+	}
 ): Promise<void> {
 	const token = await getToken();
 	const res = await fetch(`${PB_URL}/api/collections/app_users/records/${userId}`, {