feat: complete tag management and UI integration

- Marked multiple tasks as completed in TODO.md related to tag management features.
- Replaced manual tag input with `TagInput` component in `CreateTaskForm`, `EditTaskForm`, and `QuickAddTask` for better UX.
- Updated `TaskCard` to display tags using `TagDisplay` with color support.
- Enhanced `TasksService` to manage task-tag relationships with CRUD operations.
- Integrated tag management into the global context for better accessibility across components.

hooks/useTasks.ts

@@ -162,9 +162,6 @@ export function useTasks(
 
     // 3. Appel API en arrière-plan
     try {
-      // Délai artificiel pour voir l'indicateur de sync (à supprimer en prod)
-      await new Promise(resolve => setTimeout(resolve, 1000));
-      
       const response = await tasksClient.updateTask(data);
       
       // Si l'API retourne des données différentes, on met à jour