Refactor CPTimeZone to utilize native JavaScript timezone APIs

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Remove the legacy, locally-bundled tzdata payload and re-implement CPTimeZone to wrap the host JavaScript engine's native timezone capabilities.
This uses fundamental properties of the host Javascript environment and is supported by browsers and Node.

* Transition offset calculations, abbreviation lookups, and DST evaluations to rely on native temporal data via underlying bridging functions (e.g., `_offsetMinutesForZone`, `_abbreviationForNameAndDate`).
* Implement synthetic fallback logic for fixed-offset abbreviations when native engines fail to produce IANA short names.
* Route localized timezone name resolution (`_localizedNameForZone`) through native formatters.
* Establish deterministic temporal baseline required by CPDateFormatter test suites.

Eliminates the maintenance burden of updating a bundled tzdata package and guarantees timezone resolution remains synchronized with the host environment.

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David Richardson committed 2026-09-11 18:36:12 -06:00

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Foundation/CPTimeZone.j

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