- New TRADITIONAL_CHINESE catalog: the same (command, English label) keys as JAPANESE and
SIMPLIFIED_CHINESE, one entry per fixed menu row (618 rows). The wording follows the
Traditional Chinese catalogs PhotoCraft, PdfCraft, VectorCraft and LightCraft already ship
(`檔案`, `開啟`, `儲存`, `圖層`, `遮色片`, `影格`, `預設集`, `快速鍵`, …).
- Match System maps a Traditional Chinese locale (`zh-TW`, `zh-HK`, `zh-Hant`, `zh_MO`) to
`zh-hant` instead of English, now that there is a catalog for it.
- `simplified()` and `traditional()` replace the Simplified-only `chinese()`; the macOS Services
item is 服务 in Simplified and 服務 in Traditional.
- `general.language` gains 繁體中文; `docs/preferences.md` documents the locale mapping.
- Tests: all three catalogs must cover the same fixed TREE entries; the shape check covers both
Chinese catalogs; label/undo/panel-title/submenu/native-menu behaviour in zh-hant with file and
layer names kept verbatim; the Traditional locale mapping; the preference round-trips.
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