Add a documented vitest coverage threshold gate for the frontend src directory

[1nonlypiece]

📌 Description

The repo runs Vitest with v8 coverage and a coverage CI workflow
(.github/workflows/coverage.yml, docs/coverage-ci.md), but vitest.config.ts
does not enforce explicit per-metric thresholds for the frontend src/ tree.
Without enforced thresholds, coverage can silently erode below the project's
stated 95% expectation.

This issue adds documented coverage thresholds to the Vitest config so CI fails
when coverage drops.

Goal: enforce statement/branch/function/line coverage thresholds in
vitest.config.ts and document them.

🎯 Requirements and Context

• Add coverage.thresholds to vitest.config.ts at a level consistent with the
  project's stated bar.
• Scope includes/excludes sensibly (exclude generated/config/test files).
• Document the policy and how to run coverage locally in docs/coverage-ci.md.
• Ensure the existing coverage workflow respects the thresholds.

🛠️ Suggested Execution

1. Fork the repo and create a branch

git checkout -b enhancement/coverage-thresholds

2. Implement changes

• Add thresholds to vitest.config.ts.
• Update docs/coverage-ci.md.

3. Test and commit

• Run pnpm test:coverage to confirm thresholds apply and pass.

Example commit message

ci: enforce vitest coverage thresholds for src

✅ Guidelines

• Minimum 95% test coverage on any new/changed logic.
• CI fails when coverage drops below threshold.
• Timeframe: 96 hours.

🏷️ Labels

type-enhancement · type-documentation · area-frontend · MAYBE REWARDED · GRANTFOX OSS · OFFICIAL CAMPAIGN

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[yunus-dev-codecrafter]

@yunus-dev-codecrafter has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi! I've carefully reviewed the entire task description and fully understand the requirements and expected outcome.
I have experience working on similar tasks and I'm confident I can complete this within about an hour. I'd be happy to take ownership of this issue and submit a clean, well-tested solution promptly.
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[grantfox-oss]

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Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #809)
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[drips-wave]

Congratulations, @yunus-dev-codecrafter! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @yunus-dev-codecrafter: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@yunus-dev-codecrafter's PR #888 was approved and merged by @1nonlypiece.

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