ci: add TypeScript check to PR workflow

[rutefig]

Runs yarn tsc --noEmit on all PRs targeting main to catch type errors before merge. This prevents build failures during Render deployment.

Summary by CodeRabbit

• Chores
  • Added automated TypeScript type checking for pull requests to ensure code quality during development.

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[linear]

REG-635

[coderabbitai]

Walkthrough

Introduces a new GitHub Actions CI workflow configured to automatically run TypeScript type checking on pull requests targeting the main branch. The workflow sets up Node.js 20, installs dependencies via yarn, and executes the TypeScript compiler in no-emit mode.

Changes

Cohort / File(s)	Summary
GitHub Actions CI Workflow .github/workflows/ci.yml	New workflow file for TypeScript type checking; triggers on pull requests to main branch; runs tsc --noEmit after environment setup and dependency installation

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• Single configuration file addition with standard GitHub Actions syntax
• No logic changes or business logic to evaluate
• Straightforward workflow structure following common CI patterns

Poem

🐰 A workflow we weave with types held tight,
TypeScript checks dance in the GitHub light,
No errors shall slip through our fuzzy sight,
Pull requests polished—oh, what a delight! ✨

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📥 Commits

Reviewing files that changed from the base of the PR and between 459c3eb and 7447aaa.

📒 Files selected for processing (1)

• .github/workflows/ci.yml (1 hunks)

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