Add email notification preference for task completion

- Add EmailTaskCompleted field to NotificationPreference model
- Update notification repository to include email preference in queries
- Check email preference before sending task completion emails
- Add email preference toggle to admin panel notification-prefs page
- Update API types for email preference support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

admin/src/app/(dashboard)/notification-prefs/page.tsx

@@ -156,6 +156,16 @@ export default function NotificationPrefsPage() {
         />
       ),
     },
+    {
+      accessorKey: 'email_task_completed',
+      header: 'Email: Completed',
+      cell: ({ row }) => (
+        <Switch
+          checked={row.original.email_task_completed}
+          onCheckedChange={() => handleToggle(row.original.id, 'email_task_completed', row.original.email_task_completed)}
+        />
+      ),
+    },
     {
       id: 'actions',
       cell: ({ row }) => {
@@ -194,7 +204,7 @@ export default function NotificationPrefsPage() {
         <div>
           <h1 className="text-2xl font-bold">Notification Preferences</h1>
           <p className="text-muted-foreground">
-            Manage user notification preferences for push notifications
+            Manage user notification preferences for push notifications and emails
           </p>
         </div>
       </div>

admin/src/lib/api.ts

@@ -597,6 +597,8 @@ export interface NotificationPreference {
   task_assigned: boolean;
   residence_shared: boolean;
   warranty_expiring: boolean;
+  // Email preferences
+  email_task_completed: boolean;
   created_at: string;
   updated_at: string;
 }
@@ -616,6 +618,8 @@ export interface UpdateNotificationPrefRequest {
   task_assigned?: boolean;
   residence_shared?: boolean;
   warranty_expiring?: boolean;
+  // Email preferences
+  email_task_completed?: boolean;
 }
 
 // Notification Preferences API