Notifications: deep-link on tap + swipe-to-dismiss

Each notification now navigates to its related screen when tapped (toast or
list): friend_request/invite -> Friends, achievement/reward -> Achievements,
daily -> opens the daily-reward modal, coin-purchase success -> Shop. An
explicit per-notification 'route' overrides the kind default.

List rows are swipeable (drag aside) and have an X to dismiss individually,
plus a Clear-all button; the toast can be flicked up to dismiss or tapped to
open. New store actions: markRead/remove/clearAll + openNotification navigator.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/lib/online/types.ts

@@ -593,6 +593,7 @@ export type NotificationKind =
   | "friend_request"
   | "invite"
   | "achievement"
+  | "reward"
   | "daily"
   | "system";
 
@@ -606,6 +607,10 @@ export interface AppNotification {
   icon: string; // emoji
   ts: number;
   read: boolean;
+  /** explicit deep-link target screen name (overrides the kind default) */
+  route?: string;
+  /** optional payload, e.g. a user id (friend_request) the target screen can use */
+  payload?: string;
 }
 
 /* ------------------------------ Avatars ------------------------------ */