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iAstro 93853ebc65 refactor(i18n): drive locale normalisation from shipped resource keys
Per review feedback on #174: the hardcoded if/else in
normalizeLanguageCode required touching the function for every new
language, so a bare `ko` would miss the `ko-KR` resource #161 is about
to add and Korean users would land on English despite the fix.

Replace it with createLanguageNormalizer(resourceKeys), a factory that
derives its mapping from the resource keys i18next is configured with:

  1. exact resource key              -> unchanged
  2. one resource for the language   -> that key (ko -> ko-KR)
  3. several (zh-CN / zh-TW)         -> script subtag, then region
  4. nothing shipped                 -> unchanged, fallbackLng applies

getLanguageDetectionOptions now takes the resource keys and i18n.ts
passes Object.keys(resources). Chinese disambiguation stays as the only
special case - one language, two scripts; every other mapping derives
from the index automatically.

Test expectations for the zh-TW family change from "zh-TW" to "zh-CN":
only zh-CN ships today and the factory maps to shipped keys only, so
Traditional resolves directly to Simplified instead of leaking into the
fallback chain. The rendered UI is identical either way, and the new
extensibility cases lock in the automatic disambiguation once a zh-TW
bundle registers - plus the auto-resolution of a newly registered
language like ko-KR.

28 -> 31 tests; extension suite 832/832; tsc, biome and ext:build clean.
2026-09-04 15:42:40 +08:00
..