Introduces a new task status system allowing users to create, rename,
recolor, reorder, and delete custom statuses.

Key changes:
- Added `TaskStatus` domain model and `ITaskStatusRepository`.
- Implemented CRUD commands for task statuses (`SaveTaskStatusCommand`,
  `DeleteTaskStatusCommand`).
- Integrated status management into task lifecycle:
  - `SaveTaskCommand` now synchronizes `statusId` with `completedAt`.
  - `TaskTable` schema updated to include `status_id`.
- Added UI components for status management:
  - `TaskStatusesSetting` in task settings.
  - `StatusSelectionDialog` for task editing.
  - `StatusAwareCompleteButton` for status-colored checkboxes.
- Enhanced Kanban board view to support grouping and columns by status.
- Added database migration (v33 to v34) to seed built-in 'To Do' and
  'Done' statuses and backfill existing tasks.
- Added comprehensive localization support for status-related strings.

Update the database migration to use the quoted "order" column name
to avoid conflicts with SQL reserved keywords. Update task-related
unit and performance tests to handle the new GetListTaskStatusesQuery
within their respective mock mediators.

…uses

- Extract StatusLoaderMixin to eliminate duplicated _loadStatuses() pattern
- Refactor StatusChip and StatusAwareCompleteButton to use StatusLoaderMixin
- Decouple StatusChip from task details rebuild cycle via mixin-based status resolution
- Fix GetTaskStatusQueryResponse to use standalone DTO instead of extending TaskStatus entity
- Add input validation (name length, hex color format) to SaveTaskStatusCommand
- Add get_tasks error translations to all 22 locales
- Remove unused imports across affected files
- Add DB index on task_table.status_id for query performance

Add comprehensive unit tests for new task status CQRS handlers:
- SaveTaskStatusCommand (name validation, color format, max count)
- DeleteTaskStatusCommand (built-in status protection, reassignment)
- GetListTaskStatusesQuery (pagination, includeDeleted)
- GetTaskStatusQuery (DTO mapping)

Also fix:
- Error handling in TaskStatusesSetting widget
- Status resolution logging in TaskGroupCreationHandler
- Decouple status fetch from task list query
- Update existing tests for API changes (removed isDoneStatus param)

Addresses architecture review findings M3, M6, M7, M8, H5, H6, M13.

- Move built-in status backfill from presentation to query handler layer
- Add TaskStatusDisplay.resolveKey() for single source of truth on empty-name convention
- Apply StatusLoaderMixin to StatusSelectionDialog to reduce code duplication
- Update TaskGroupCreationHandler to use centralized status resolution logic
- Remove duplicate status construction logic from tasks_list presentation layer
- Add logging when status resolution fails in TaskGroupCreationHandler

Fixes M10, M11, M12, M13, H3, H5, H6 from architecture review.

When switching to board view mode without a grouping selection, the
Kanban board displays empty because columns require grouping to be
enabled. This fix automatically applies board defaults (grouping by
status) when entering board mode if grouping is not already enabled.

**Files Changed:**
- lib/presentation/ui/features/tasks/pages/tasks_page.dart

**Fix Details:**
- Updated `_onViewModeChange` to check if grouping is disabled
- Applies board sorting defaults (status grouping) when entering board mode
- Respects existing grouping configuration if already enabled
- Prevents empty Kanban board when switching from list view

**Testing:**
- ✅ All 299+ tests passing
- ✅ No code analysis issues
- ✅ Properly formatted

**Issue Resolved:**
Switching to Kanban board without grouping selection now automatically
selects status grouping, ensuring proper column display.

Refactor the task status management system to treat built-in statuses
(To Do, Done) as first-class citizens within the domain and persistence
layers.

Key changes:
- Update `DriftTaskStatusRepository` to provide virtual built-in
  statuses if they are missing from the database, ensuring system
  stability during migrations.
- Implement `existsInDb` in the repository to distinguish between
  persisted custom statuses and virtual built-in ones.
- Modify `SaveTaskStatusCommand` to allow empty names for built-in
  statuses and ensure they are correctly persisted/updated.
- Update `GetListTaskStatusesQuery` to merge database results with
  guaranteed built-in status items.
- Restrict reordering and deletion of built-in statuses in the
  `TaskStatusesSetting` UI.
- Add localized tooltips and UI indicators to clarify the
  non-deletable nature of built-in statuses.

Reorder and adjust the available sort options in the task list options
menu to improve usability.

Key changes:
- Reorder sort fields to prioritize status, priority, and title.
- Add planned date and deadline date sorting options back to the list.
- Adjust the sequence of existing sortable fields.

- Add `ReorderTaskStatusesCommand` to allow batch updating of status order.
- Implement `updateMultiple` in `IRepository` and `DriftBaseRepository` for efficient batch operations.
- Enhance `SaveTaskStatusCommandHandler` to persist built-in statuses when modified.
- Update `TaskGroupCreationHandler` to resolve status IDs from translation keys or names.
- Add validation for status names (empty/length) and color formats.
- Update localization files with new task status error messages.
- Improve `TaskStatus` JSON parsing with robust error handling.