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.

scripts/seed-data.ts

@@ -52,7 +52,8 @@ async function seedTestData() {
       const priorityEmoji = {
         'low': '🔵',
         'medium': '🟡',
-        'high': '🔴'
+        'high': '🔴',
+        'urgent': '🚨'
       }[task.priority];
       
       console.log(`  ${statusEmoji} ${priorityEmoji} ${task.title}`);