Files
rplace/test
tiennm99 a823f8527d fix: address ultrareview findings across backend and frontend
Backend:
- rate-limiter: retryAfter now in seconds; ms-precision lu preserves
  fractional regen residue across calls (C1, C2)
- redis-client: throw on Upstash 200-with-error envelope; redisRaw
  returns body.result (NH1)
- constants: MAX_BATCH_SIZE = MAX_CREDITS = 256 (was 512 vs 256)
- worker: content-length cap, gzip + s-maxage=10 on /api/canvas,
  broadcast via executionCtx.waitUntil with r.ok check (NC2, H4, H5)
- canvas-storage: warn on truncated Upstash read instead of silent
  zero-pad (NH2)
- get-user-id: SHA-256 (16 hex chars) replaces 32-bit string hash;
  missing cf-connecting-ip routes to anon:dev with warn (H1, H2);
  function is now async
- canvas-room: log unclean WS closes and errors; defensive close on
  unexpected client message (NH4, N5)

Frontend:
- pixel buffer capped at MAX_BATCH_SIZE with toast (NC2)
- Submit error UX: toast for 429/413/400/5xx/network; honor
  retryAfter (NC1)
- committedColors allocated upfront so WS updates during initial
  fetch no longer null-deref (NC3)
- handleWheel always renders even when zoom is clamped (C1, C2)
- canvas-decoder throws on truncated input instead of reading past
  end with || 0 (C3)
- WS reconnect refetches canvas to recover missed pixels (C4)
- pixel-buffer Map cache for O(1) getColorAt/pixelCount (NH1)
- cancel in-progress stroke on mode switch (NH3)
- canvas load error overlay with Retry button (NH5)
- DPR-aware canvas sizing (H1)
- onMount cleanup is now sync (no leaked resize listener) (H2)

Tests:
- update for async getUserId, decoder bounds check, redis error
  format; add Upstash error-envelope coverage
2026-04-17 10:14:45 +07:00
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