fix(test): resolve TypeScript errors in test files

- Fix unused parameter warning in global-setup.ts
- Fix unknown error type in error handling
- Fix unused variable in test-runner.ts

All tests now compile without TypeScript errors.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

reactrebuild0825/tests/test-runner.ts

@@ -151,7 +151,7 @@ class TestRunner {
     
     try {
       const command = `npx playwright test tests/${suite.file} ${playwrightOptions}`;
-      const { stdout, stderr } = await execAsync(command);
+      const { stdout } = await execAsync(command);
       
       this.results[suite.name] = {
         success: true,