Add automated Firebase deployment workflow

[google-labs-jules]

This PR adds a GitHub Actions workflow to automatically deploy the application to Firebase Hosting whenever changes are pushed to the main branch.

The workflow performs the following steps:

1. Checks out the code.
2. Sets up Node.js v22.
3. Installs dependencies using npm ci.
4. Runs linting (npm run lint), but does not block deployment on failure as requested.
5. Runs tests (npm test --if-present) if a test script is defined. If tests fail, the deployment is blocked.
6. Builds the project (npm run build).
7. Deploys to Firebase using firebase-tools and the FIREBASE_TOKEN secret.

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PR created automatically by Jules for task 1895119281177020683 started by @ahoydave

[google-labs-jules]

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