⚙️ refactor: Enhance Logging, Navigation And Error Handling

[danny-avila]

Summary

• Replaced console logs with logger.warn and logger.error in the useNavigateToConvo hook
• Ensured missing or removed endpoints are properly handled in the useNavigateToConvo hook
  • Closes [Bug]: Unable to use endpoint switching when original endpoint is deleted #5750 / Unable to use endpoint switching when original endpoint is deleted #5909
• Updated the buildDefaultConvo utility to accept an optional endpoint parameter and reorganized parameter usage for clearer default conversation initialization.
• Enhanced the logger utility by introducing a type parameter to standardize log formatting across different log levels.
• Fixed the HeaderOptions component to prevent ModelSelect from rendering when using agent endpoints
• Improved the logAxiosError function in the API utils by streamlining error handling with try-catch logic and reducing verbosity when no response is received.

Checklist:

• My code adheres to this project's style guidelines
• I have performed a self-review of my code
• I have commented in complex areas for clarity
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have written tests demonstrating that my changes are effective
• Local unit tests pass with my changes
• Any changes dependent on mine have been merged and published in downstream modules