feat: add primary tag functionality to tasks

- Introduced `primaryTagId` to `Task` model and updated related components to support selecting a primary tag.
- Enhanced `TaskCard`, `EditTaskForm`, and `TagInput` to handle primary tag selection and display.
- Updated `TasksService` to manage primary tag data during task creation and updates.
- Added `emoji-regex` dependency for improved emoji handling in task titles.

package.json

@@ -29,6 +29,7 @@
     "bcryptjs": "^3.0.2",
     "clsx": "^2.1.1",
     "date-fns": "^4.1.0",
+    "emoji-regex": "^10.5.0",
     "next": "15.5.3",
     "next-auth": "^4.24.11",
     "prisma": "^6.16.1",