ci: add astro check, GHA workflow, and pre-commit hook

[ruivieira]

What and why

Adds type-checking and build validation to the repo so errors are caught before merge. Closes no issue — quality infrastructure work.

Type

• ci

Changes

• .github/workflows/ci.yml — new CI job that runs astro check then astro build on all PRs and non-main pushes
• package.json — adds check script (astro check); adds @astrojs/check and typescript as dev deps
  • src/env.d.ts — declares virtual modules (virtual:starlight-blog/config, virtual:@pasqal-io/starlight-client-mermaid) and extends Window with __mermaidClassName
• src/components/ProviderCatalog.astro — removes dead selectedId variable; adds non-null assertions on providerId inside the closure where the outer guard already guarantees it is defined
• .pre-commit-config.yaml — local pre-commit hook running npm run check

Testing

• npm run check passes with 0 errors locally
• CI verified on this PR

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 059c7b54-bfa0-4679-a97a-3835994b0d6e

📥 Commits

Reviewing files that changed from the base of the PR and between 54f83db and 37a2823.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (6)

• .github/workflows/ci.yml
• .pre-commit-config.yaml
• package.json
• src/components/MarkdownContent.astro
• src/components/ProviderCatalog.astro
• src/env.d.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[julpayne]

LGTM (maybe there is a duplicate file with the other PR?)