Code Review Bench PR #30156 - fix: remove hardcoded 48-character limit from text inputs

[tomerqodo]

Code Review Bench PR langgenius#30156

Original PR Title: fix: remove hardcoded 48-character limit from text inputs
Original PR Description: ## Summary

• Removes the hardcoded DEFAULT_VALUE_MAX_LEN (48 characters) fallback from text input components
• When max_length is not configured, inputs now have no character limit as expected
• Only applies maxLength when explicitly configured by the user

Test plan

• All existing tests pass (5458 tests)
• Added new tests to verify maxLength behavior:
  • Input should not have maxLength attribute when max_length is not set
  • Input should have maxLength attribute when max_length is set

fixes langgenius#26940
Original PR URL: langgenius#30156