test(DashboardPage): verify all three StatsCards render with correct titles

[Tiya22gif]

▶ Description

Fixes #742

This PR improves test coverage for the DashboardPage by verifying that all three "StatsCard" components render correctly with the expected titles and values.

▶ Changes Made
Verified the following StatsCard text content:
● "Current Streak: 5"
● "Peak Streak: 15"
● "Contributions: 500"

Added a new assertion to ensure exactly three StatsCard components are rendered:
"ts id="kgduut"
expect(screen.getAllByTestId('stats-card')).toHaveLength(3);"

▶ Pillar
Testing / Quality Assurance

▶ Validation
Successfully ran the complete Vitest test suite locally.
"txt id='uw3jzu'
Test Files 27 passed (27)
Tests 353 passed (353)"
All existing tests continue to pass successfully.

▶ Why This Matters
This improves dashboard reliability by ensuring:
● all expected statistics render consistently
● the exact number of StatsCard components is validated
● future UI regressions can be caught automatically

▶ Checklist
[x] Added StatsCard count assertion
[x] Verified all required stat titles
[x] Followed existing testing conventions
[x] All tests passing
[x] No unrelated files modified

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