Add codegen step to frontend CI/CD workflow

The generated GraphQL types are in .gitignore and need to be generated during CI/CD.
Added npm run codegen step before TypeScript compilation and build to ensure the generated files exist.

Co-authored-by: PhantomDave <34485699+PhantomDave@users.noreply.github.com>

Author: Copilot

.github/workflows/frontend.yml

@@ -34,6 +34,10 @@ jobs:
       working-directory: ./frontend
       run: npm ci
 
+    - name: Generate GraphQL types
+      working-directory: ./frontend
+      run: npm run codegen
+
     - name: Check TypeScript compilation
       working-directory: ./frontend
       run: npx tsc --noEmit