chore: add Astro type checking to local scripts and CI

[setchy]

Summary

• Add pnpm check (astro check) with pinned @astrojs/check, compatible TypeScript 6, and Node 24 declarations.
• Add an independent Type Check [astro] lint-workflow job on pull requests and pushes to main, using existing pinned actions and least-privilege permissions.
• Resolve baseline diagnostics with a test parameter annotation and a narrowly scoped Tailwind Motion plugin type assertion for its v3-era declaration mismatch.
• Document the command and CI behavior; preserve strict checking, existing jobs, build commands, and Netlify configuration.

Validation

• Clean isolated pnpm install --frozen-lockfile followed by pnpm check, without a prior production build or installation prompt.
• Separate injected Astro prop and TypeScript assignment errors each produce exit status 1; temporary fixtures removed and baseline passes.
• pnpm lint:check
• pnpm test (4 tests passed)
• pnpm build
• actionlint 1.7.12 with ShellCheck 0.11.0
• Verify unchanged workflow triggers, existing jobs, runtime dependencies, strict configuration, and deployment commands.

Existing nonblocking hints/warnings remain: an unused Astro import, deprecated clipboard fallback, SVG accessibility lint warnings, and a mixed static/dynamic image import warning.

Scope

No runtime behavior changes or remote branch-protection changes. OpenSpec change: add-astro-type-checking (planning artifacts are repository-ignored).

[netlify]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud