Interop gen additional literal types (#503)
* interop_gen: support additional literal type expressions via TypeChecker
* fixed analyzer warning
* simplify literal parsing and improve readability
* Refactor literal handling and expand literal tests
Use a shared helper to reduce duplication, remove unused TSTypeFlags, and
add integration tests for false, null, and negative numeric literals.
* Use typed literal helpers in _transformType and add tests
Refactor literal handling to use scoped, typed helpers instead of a
generic value-based helper. Clean up unused TSTypeFlags and add
integration tests for false, null, and resolved-type literals.
* fix CI issue
* enable fallback literal coverage and update expectations
5 files changed
