feat: task templates (vibe-kanban) (#197)

* I've successfully implemented task templates for vibe-kanban with the following features:

- Created a new `task_templates` table with fields for:
  - `id` (UUID primary key)
  - `project_id` (nullable for global templates)
  - `title` (default task title)
  - `description` (default task description)
  - `template_name` (display name for the template)
  - Timestamps for tracking creation/updates

- Created `TaskTemplate` model with full CRUD operations
- Added REST API endpoints:
  - `GET /api/templates` - List all templates
  - `GET /api/templates/global` - List only global templates
  - `GET /api/projects/:project_id/templates` - List templates for a project (includes global)
  - `GET /api/templates/:id` - Get specific template
  - `POST /api/templates` - Create template
  - `PUT /api/templates/:id` - Update template
  - `DELETE /api/templates/:id` - Delete template

1. **Task Creation Dialog**:
   - Added template selector dropdown when creating new tasks
   - Templates are fetched based on project context
   - Selecting a template pre-fills title and description fields
   - User can edit pre-filled values before creating the task

2. **Global Settings**:
   - Added "Task Templates" section to manage global templates
   - Full CRUD interface with table view
   - Create/Edit dialog for template management

3. **Project Settings**:
   - Modified project form to use tabs when editing
   - Added "Task Templates" tab for project-specific templates
   - Same management interface as global settings

- **Scope Management**: Templates can be global (available to all projects) or project-specific
- **User Experience**: Template selection is optional and doesn't interfere with normal task creation
- **Data Validation**: Unique template names within same scope (global or per-project)
- **UI Polish**: Clean interface with loading states, error handling, and confirmation dialogs

The implementation allows users to create reusable task templates that streamline the task creation process by pre-filling common values while still allowing full editing before submission.

* improve styling

* address review comments

* fix unqiue contraint on tempaltes

* distinguish between local and global templates in UI

* keyboard shortcuts for task creation

* add dropdown on project page to select templates

* update types

* add default global task templates

* Add task templates from kanban (#219)

* Create project templates from kanban

* Fixes

* remove duplicate

---------

Co-authored-by: Louis Knight-Webb <louis@bloop.ai>

frontend/package.json

@@ -22,6 +22,7 @@
     "@radix-ui/react-select": "^2.2.5",
     "@radix-ui/react-separator": "^1.1.7",
     "@radix-ui/react-slot": "^1.2.3",
+    "@radix-ui/react-tabs": "^1.1.12",
     "@radix-ui/react-tooltip": "^1.2.7",
     "@sentry/react": "^9.34.0",
     "@sentry/vite-plugin": "^3.5.0",