ci: fail if Paraglide generated files are out of sync with messages JSON

.gitea/workflows/ci.yaml

@@ -63,6 +63,9 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Check Paraglide codegen is up to date
+        run: npm run paraglide && git diff --exit-code src/lib/paraglide/
+
       - name: Type check
         run: npm run check