Adds a new board/kanban view alongside the existing list view on the
Issues page. Users can toggle between views via a segmented control
in the toolbar. The preference persists in localStorage.
Board view features:
- Columns for all 7 status types (backlog through cancelled)
- Drag-and-drop cards between columns to update issue status
- Cards display identifier, title, priority, assignee, and live indicator
- Uses existing @dnd-kit library already in the project
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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