feat(viewer): sort the board sidebar by Name · Created · Updated

[ivanmkc]

Problem

When several agents push to several boards, there's no way to tell which board changed most recently — the sidebar lists boards in fixed alphabetical order.

What this adds

A 3-way sort toggle above the board list:

• Name — A→Z (the previous default)
• Created — newest first
• Updated — newest first

The choice is persisted in localStorage (default Name, so existing users see no change until they switch). Each board row shows a muted "Xm ago" for the active key, refreshed in place every 60s; in Created/Updated modes the single most-recent board wears a "latest" tag.

Data plumbing

• Payload gains a stable createdAt. Store.set resolves it once (incoming ?? existing ?? ts) and returns the canonical stored payload, so created-time is set at first push, preserved across every later update, and survives reloads via persistence. Pushers can't forge it — asPayload never reads it from the request body.
• The four update broadcasts now send the stored payload, so both timestamps reach the client on every event; createdAt is also added to GET /list.
• sortBoards is a pure, DOM-free helper in state.ts (name asc / created desc / updated desc, stable name tie-break), unit-tested directly.
• The demo seed staggers each board's created/updated time so the toggle is demonstrable on /w/demo/.

Verification

• Unit: npx vitest run → 432/432 pass (incl. new Store.createdAt + sortBoards cases).
• Build: npm run build exit 0.
• e2e: new board-sort.e2e.mjs (chained into the e2e CI script) → 12/12: order per mode, the "latest" tag, and persistence across reload. Existing rich.e2e.mjs → 57/57 (no regression from the Store.set return / broadcast change).
• Visual: screenshotted /w/demo/ (12 staggered boards) in all three modes at desktop — Name = alphabetical (no tag), Created/Updated = newest-first with the "latest" tag and per-row "Xm ago".

Viewer-only; no plugin/CLI bump (no recipe/skill change). The seed.ts change re-seeds on a fresh container at deploy.

Name mode	Updated mode
alphabetical, no tag	newest-first, "latest" tag + per-row "Xm ago"