Senior Engineer 76d431e1ec Add E.164 input validation for phone numbers (FRE-4506) ...

- Extract phone validation to reusable utility (src/utils/phone-validation.ts)
- Use libphonenumber-js for strict E.164 format validation
- Normalize accepted numbers to canonical E.164 format
- Add 22 comprehensive validation tests covering valid/invalid formats
- Update existing tests to use valid E.164 test numbers
- All 56 tests passing

Co-Authored-By: Paperclip <noreply@paperclip.ing>

2026-04-29 21:22:23 -04:00

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