ci(coverage): add frontend and contract coverage thresholds

[unixfundz]

Closes #314

Changes

.github/workflows/ci.yml

• Renamed coverage job to Contract Coverage; added --fail-under 60 to cargo tarpaulin — CI fails if contract line coverage drops below 60%
• Added frontend-coverage job:
  • Runs after the frontend job
  • Runs npm run coverage (Vitest) — Vitest exits non-zero if any threshold is not met, blocking the CI run

frontend/package.json

• Added test and coverage scripts (Vitest)
• Added vitest@1.6.0 and @vitest/coverage-v8@1.6.0 as pinned dev dependencies

frontend/vite.config.ts

• Added test block configuring Vitest with jsdom environment and v8 coverage provider
• Set 60% threshold on lines, functions, branches, and statements — Vitest fails CI if any metric falls below

Thresholds

Target	Tool	Threshold
Rust contracts	cargo-tarpaulin	60% lines
Frontend	Vitest + v8	60% lines / functions / branches / statements

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