chore: refactor tests to improve clarity and reliability

- Removed unnecessary test.skip() calls in various test files, replacing them with comments for clarity.
- Enhanced retry logic in TestDataManager for API requests to handle rate limiting more gracefully.
- Updated security helper functions to include retry mechanisms for fetching security status and setting module states.
- Improved loading completion checks to handle page closure scenarios.
- Adjusted WebKit-specific tests to run in all browsers, removing the previous skip logic.
- General cleanup and refactoring across multiple test files to enhance readability and maintainability.

frontend/src/api/__tests__/client.test.ts

@@ -130,9 +130,10 @@ describe('api client', () => {
     expect(handler).toBeDefined()
 
     // Call handler with auth endpoint error to verify it skips the auth error handler
-    if (handler) {
-      await handler(error)
-    }
+    const resultPromise = handler ? handler(error) : Promise.reject(new Error('handler missing'))
+
+    await expect(resultPromise).rejects.toBe(error)
+    expect(onAuthError).not.toHaveBeenCalled()
 
     warnSpy.mockRestore()
   })