fix: improve dashboard header keyboard navigation

[Namratha36]

Summary

Improved keyboard accessibility in the dashboard header by removing an unnecessary explicit tabIndex={0} from the GitHub profile avatar link.

Anchor elements with a valid href are already keyboard focusable by default, so the explicit tabindex was redundant. This change preserves the natural DOM focus order and relies on native browser behavior.

Closes #1074

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Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup

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Changes Made

• Removed unnecessary tabIndex={0} from UserAvatar.tsx
• Preserved native keyboard navigation behavior
• Improved accessibility by relying on the browser's default focus handling
• Verified no impact on avatar link functionality

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How to Test

1. Run the application locally
2. Navigate to the dashboard header
3. Use the Tab key to move through header controls
4. Verify the GitHub profile avatar remains keyboard accessible
5. Confirm navigation order remains unchanged

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Checklist

• Linked issue in summary
• npm run lint passes locally
• Self-reviewed the diff
• No unrelated files included in the commit

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Accessibility

• Keyboard navigation preserved
• Native focus behavior used
• No visual regressions introduced

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