### Two unrelated but small UI fixes surfaced while testing the Canvas
**1. Legend hidden under the open TemplatePalette.**
Legend is `fixed bottom-6 left-4 z-30`. TemplatePalette's drawer (when
open) is `fixed top-0 left-0 w-[280px] z-30` — same z-index, same
left-edge column. The Legend overlapped the palette's bottom 180 px.
Published the palette-open state to the canvas store so the Legend
can shift right (to `left-[296px]` — 280 px palette + 16 px gap) while
the palette is open, animated via a 200 ms `transition-[left]` to
match the palette's slide. Closes cleanly back to `left-4` when the
palette is dismissed.
Files:
- `store/canvas.ts` — added `templatePaletteOpen` + `setTemplatePaletteOpen`.
- `TemplatePalette.tsx` — calls `setTemplatePaletteOpen(open)` on
every open/close transition via a new useEffect.
- `Legend.tsx` — reads the flag and swaps `left-4` <-> `left-[296px]`.
**2. "WebSocket is closed before the connection is established" spam.**
Two components (`ChatTab`, `AgentCommsPanel`) open their own short-
lived WebSocket to tail the ACTIVITY_LOGGED stream. Their cleanup
path called `ws.close()` unconditionally, which trips a browser
console warning when React StrictMode re-runs the effect in dev and
the handshake hasn't completed yet. Confirmed via DevTools console
on the running canvas.
Added a `closeWebSocketGracefully(ws)` helper in `lib/ws-close.ts`:
- OPEN / CLOSING → close immediately (normal path).
- CONNECTING → defer close to the 'open' listener so the
browser sees a full handshake. Also wires an
'error' listener that cancels the queued close
if the handshake fails (no double-close).
- CLOSED → no-op.
Both consumers now call the helper in their useEffect cleanup.
Silences the warning without changing observable behaviour.
### Tests
`canvas/src/lib/__tests__/ws-close.test.ts` — 5 cases with a fake
WebSocket covering each readyState branch plus the error-before-open
cancellation path. Full vitest suite: 927/927 pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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