Todo Panel — Status cycle + done section + archive

[harrryyd]

Parent

#44

What to build

Click-to-cycle status icon on each item (todo → in-progress → done → todo). A "Done" section at the bottom of the sidebar shows the last 10 completed items. Archive spill to a separate file.

State machine: todoStore gains cycleStatus(itemId):

• todo → in-progress: sets status, stays in category
• in-progress → done: sets status, moves to done collection, sets completedAt
• done → todo: sets status, returns to original category

Archive cutoff: when the done list exceeds 10 items, the oldest (by position) moves to ~/.t3code/todos-archive.json. The todoPersistence module handles this on each write.

UI: Status icon displays the current state (circle=empty for todo, circle=half for in-progress, checkmark for done). Clicking cycles. Done items appear in a collapsed "Done" section at the bottom of the sidebar showing the last 10. Each done item shows its original category as a small badge/tag.

Tests: Status cycling edge cases, archive spill when 11th item completes, return-to-category on un-complete.

Acceptance criteria

• Clicking status icon cycles: todo → in-progress → done → todo
• todo and in-progress items remain in their category
• done items move immediately to bottom "Done" section
• Done section shows last 10 completed items
• Done items display original category as a badge/tag
• Cycling done → todo returns item to its original category at the bottom
• Cycling done → in-progress returns item to its original category at the bottom
• When 11th item hits done, oldest spills to ~/.t3code/todos-archive.json
• Unit tests: cycleStatus transitions, archive cutoff at 11, return-to-category
• bun fmt, bun lint, bun typecheck all pass

Blocked by

• Todo Panel — Create items per category + WebSocket sync #47

[harrryyd]

Implemented and merged to main.