test: add unit tests for DashboardHeader component

[srinidhi-2006-bit]

Summary

Added unit tests for the DashboardHeader component using Jest and React Testing Library.

Closes #1042

Type of Change

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

Changes Made

• Added DashboardHeader.test.tsx
• Mocked next-auth/react session handling
• Mocked child UI components
• Added rendering tests for dashboard heading and subtitle
• Added tests for settings fetch behavior
• Added tests for authenticated and unauthenticated states
• Configured Jest setup for component testing

How to Test

Steps for the reviewer to verify this works:

1. Run:

   npx jest src/components/__tests__/DashboardHeader.test.tsx

2. Verify all tests pass successfully

3. Run:

   npm run lint
   npm run type-check

4. Verify there are no lint or TypeScript errors

Screenshots (if UI change)

N/A

Checklist

• Linked issue in summary
• npm run lint passes locally
• No TypeScript errors (npm run type-check)
• Self-reviewed the diff
• Added/updated tests if applicable

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[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[srinidhi-2006-bit]

Hi @Priyanshu-byte-coder,

Implemented the requested unit tests for DashboardHeader and verified locally that:

• npx jest src/components/__tests__/DashboardHeader.test.tsx passes
• npm run lint passes
• npm run type-check passes

The PR includes mocked session handling, fetch behavior tests, and conditional rendering coverage for the Share Profile functionality.

Could you please review the PR and add the gssoc:approved label if everything looks good?

Thank you!