fix(office-ui): resolve blank/frozen office canvas and add sidebar collapse

Office canvas fixes:
- Lazy-create the Phaser game via ResizeObserver on the first non-zero
  layout instead of creating it inside the display:none office page with
  inline px fallback sizes. Phaser's RESIZE-mode 500ms parent poll has no
  zero guard, so the old path shrank the canvas to 0x0 (blue-black screen)
  and later restored it to a stale wrong size (clipped office).
- On unhide, re-measure with scale.getParentBounds() before scale.refresh();
  plain scale.resize() is clobbered by the stale cached parentSize in
  RESIZE mode.
- Fix whole-game freeze when clicking an office card: camera effects
  resolve ease names via EaseMap, which has no 'Cubic.Out' key, leaving
  effect.ease undefined and killing the RAF loop with a per-frame
  TypeError. Use 'Cubic.easeOut' for cam.pan in panToOffice/resetCameraView.
- Bound GameBridge queues (latest snapshot supersedes, event queue capped)
  since game creation is now deferred until the Office page is first opened.

Sidebar:
- Add a collapse/expand handle on the canvas/sidebar boundary with a 220ms
  grid transition; state persists in localStorage. The canvas follows the
  column change automatically through the ResizeObserver path. Stacked
  (<=1024px) layout collapses the bottom panel and moves the handle to the
  bottom edge.

README:
- Add Simplified Chinese translation (README.zh-CN.md) with a language
  switcher in both files; fix stale TOC entries in the English README.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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