fix(javascript): reject malformed date strings - #3509
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JavaScript, TypeScript, Flow, and JavaScript PropTypes accepted malformed date-time values such as
"1". Validate timestamp shape before conversion; PropTypes retains date-only support because it maps JSON Schemadateto the same validator.Introduces unchanged shared malformed case 8 after Zod, Effect, and Python support. Depends on #3518.
Production diff: 7 lines changed.
Validation: build; API unit test; combined date-time fixtures across Zod, Effect, Python, JavaScript, and PropTypes pass. Full affected JavaScript/TypeScript/Flow groups passed 506 tests; PropTypes passed 145.