feat: add GitHub profile skill sync and improve skill-based project recommendations

[chaurasianandani389-sketch]

Related Issue

Closes #<364>

Summary

This PR introduces GitHub profile integration to automatically fetch user skills from public repositories and enhances the project recommendation workflow by using the synced skills for personalized project suggestions.

Changes Made👍👍

GitHub Skill Sync

Added GitHub username input modal.
Integrated GitHub API to fetch public repositories.
Extracted programming languages from repositories.
Automatically populated detected skills into the skill selection section.
Added validation and error handling for invalid usernames and failed API requests.

Skill Management Improvements👍👍👍

Prevented duplicate skill entries.
Synced fetched skills with existing skill chip functionality.
Updated hidden skills input automatically for form submission.

Recommendation Workflow👍👍

 Ensured fetched GitHub skills are included in recommendation requests.
 Improved skill-based project matching experience.
 Maintained compatibility with manually added skills.

UI/UX Enhancements👍👍👍

  Added modal open/close functionality.
  Added loading state during GitHub synchronization.
  Improved feedback messages for users.
  Preserved existing recommendation flow.

Testing Performed 👍👍👍👍

✅ Valid GitHub username fetches skills successfully.
✅ Skills appear as selectable chips.
✅ Duplicate skills are not added.
✅ Invalid username displays an error message.
✅ Recommendations are generated using fetched skills.
✅ Existing manual skill entry continues to work.
✅ Modal opens and closes correctly.

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[chaurasianandani389-sketch]

Please Have a look at this and tell me if further changes are required. As I have tried to fix all issue related to the skill section and project recommendation section.