Add kanban board view for tasks

[Ghvstcode]

Summary

• Adds a kanban board as a second view mode for the task list, where each column represents a task state (Pending, In Progress, Review, Done, Failed, Dismissed)
• Users can drag and drop task cards between columns to change their state
• New toolbar sits below the header with a view toggle (list/board), search input (filters by title + description, supports Cmd+F), and a filter popover for status, category, and source (Manual, AI Scan, Linear)
• Kanban columns scroll independently within a fixed board height so one long column doesn't push others off-screen
• Filters and search apply to both list and board views

New files

• KanbanBoard.tsx — DnD context with cross-column drag handling and drag overlay
• KanbanCard.tsx — draggable card component with state icon, badges, and metadata
• KanbanColumn.tsx — droppable column per task state with independent scrolling
• TaskToolbar.tsx — view toggle, search bar, filter popover

Test plan

• Toggle between list and board views — both should render correctly
• Drag a card from one column to another — task state should update
• Type in the search bar — both views should filter tasks by title/description
• Open filter popover and select status/category/source filters — tasks should filter in both views
• Clear all filters — all tasks should reappear
• With many tasks in one column, verify it scrolls independently without affecting other columns
• Verify Cmd+F focuses the search input

[vercel]

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Project	Deployment	Actions	Updated (UTC)
sustn	Ready	Preview, Comment	Mar 26, 2026 7:27am