test(RadarChart): verify at least 3 axes are always shown via padding (JhaSourav07#1159)

## Description

Fixes JhaSourav07#1073

## Pillar

- [ ] 🎨 Pillar 1 — New Theme Design
- [ ] 📐 Pillar 2 — Geometric SVG Improvement
- [ ] 🕐 Pillar 3 — Timezone Logic Optimization
- [x] 🛠️ Other (Bug fix, refactoring, docs, testing)

## Visual Preview
No visual changes (Pure UI chart component validation test coverage
improvement).

## Checklist before requesting a review:

- [x] I have read the `CONTRIBUTING.md` file.
- [x] I have tested these changes locally
(`localhost:3000/api/streak?user=YOUR_USERNAME`).
- [x] I have run the isolated file prettier formatter.
- [x] My commits follow the Conventional Commits format
(`test(RadarChart): ...`).
- [x] I have updated `README.md` if I added a new theme or URL
parameter.
- [x] I have starred the repo.
- [x] I have made sure that i have only one commit to merge in this PR.
- [x] The SVG output matches the CommitPulse "premium quality" aesthetic
standard (no raw elements, smooth animations, correct fonts).
- [x] (Recommended) I joined the CommitPulse Discord community for
contributor discussions, mentorship, and faster PR support.

Author: JhaSourav07

components/dashboard/RadarChart.test.tsx

@@ -66,4 +66,16 @@ describe('RadarChart', () => {
     expect(screen.getAllByText('JavaScript')).toBeDefined();
     expect(screen.getAllByText('Python')).toBeDefined();
   });
+
+  it('verify at least 3 axes are always shown via padding when fewer are provided', () => {
+    const singleLang = [{ name: 'TypeScript', percentage: 100, color: '#3178c6' }];
+
+    render(
+      <RadarChart languagesA={singleLang} languagesB={singleLang} labelA="User A" labelB="User B" />
+    );
+
+    expect(screen.getAllByText('TypeScript')).toBeDefined();
+    expect(screen.getAllByText('JavaScript')).toBeDefined();
+    expect(screen.getAllByText('Python')).toBeDefined();
+  });
 });