[Enhancement] Improve Error Messages and User Feedback

[DFanso]

Current error messages could be more helpful for users.

Improvements needed:

• Add colored output using a library like fatih/color
• Provide actionable error messages (e.g., "API key not found. Run: export GEMINI_API_KEY=your-key")
• Add progress indicators for API calls
• Show helpful tips when no changes are detected

[adeeshperera]

Hey @DFanso
Can you please assign this issue to me?

[DFanso]

sure @adeeshperera