FE-174 Add Vitest coverage thresholds to the CI workflow

[BigBen-7]

Track
Frontend

Difficulty
Trivial

Description
The CI workflow runs tests but does not enforce a minimum coverage threshold. Add --coverage to the test script and configure minimum thresholds (line, branch, function) in vitest.config.

Acceptance Criteria

• Vitest runs with coverage enabled in CI.
• CI fails if coverage falls below the configured thresholds.
• Thresholds are set at ≥60% line, branch, and function coverage to start.

[MaryammAli]

@MaryammAli has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

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Congratulations, @MaryammAli! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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This issue has been completed by @MaryammAli as part of the Stellar Wave Program's 5th Wave 🥳

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