feat: add notification center with bell dropdown, full page, and workspace scoping (Story 3.3)

Enhance NotificationDropdown with type-specific icons, French description builder,
click-to-navigate with mark-as-read, and "Voir toutes les notifications" link.
Add full notifications page at /notifications with pagination (25/page), individual
mark-as-read, and empty state. Includes code review fixes: workspace-scoped unread
count and dropdown items, race condition fix (mark-as-read before navigate),
efficient markAllAsRead via direct update, deleted declaration URL handling,
and per-workspace cache keys. 7 new feature tests.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

resources/js/types/index.ts

@@ -1,5 +1,6 @@
 export * from './auth';
 export * from './dashboard';
 export * from './navigation';
+export * from './notification';
 export * from './team';
 export * from './ui';

resources/js/types/notification.ts

@@ -0,0 +1,26 @@
+export type NotificationType =
+    | 'nudge'
+    | 'declaration_overdue'
+    | 'document_uploaded'
+    | 'bulk_notification'
+    | 'status_changed';
+
+export type NotificationData = {
+    workspace_id: number;
+    notification_type: NotificationType;
+    declaration_id?: number;
+    sender_id?: number;
+    client_id?: number;
+    declaration_title?: string;
+    sender_name?: string;
+    url?: string;
+};
+
+export type AppNotification = {
+    id: string;
+    type: string;
+    data: NotificationData;
+    read_at: string | null;
+    created_at: string;
+    updated_at: string;
+};