Emil b52798c634 perf: UiLayer HashMap → flat Vec array — 62 FPS → 95 FPS ...

Replaced HashMap<(i32,i32), UiCell> with Vec<Option<UiCell>> indexed
by y*width+x. dirty_keys Vec tracks non-None cells for iteration.
- set/set_alpha: O(1) array write (was O(1) amortized HashMap insert
  with hashing overhead)
- get: O(1) array index (was HashMap lookup)
- keys(): iterate dirty_keys Vec (was HashMap keys iterator)
- clear(): memset None over flat array (was HashMap::clear)
- resize() called in build_ui to size array to viewport
- All 185 tests + 14 scenarios pass
- Benchmark: 95.1 FPS (was 61.9 — 53% improvement)

2026-06-22 13:32:47 +03:00

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