fix(frontend): Fix lint and type errors in test files

- Remove unused imports (fireEvent, IssueStatus) in issue component tests
- Add E2E global type declarations for __TEST_AUTH_STORE__
- Fix toHaveAccessibleName assertion with regex pattern

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/e2e/issues.spec.ts

@@ -238,7 +238,7 @@ test.describe('Issue Management', () => {
       expect(count).toBeGreaterThan(0);
 
       // First checkbox should have accessible label
-      await expect(checkboxes.first()).toHaveAccessibleName();
+      await expect(checkboxes.first()).toHaveAccessibleName(/.+/);
     });
 
     test('issue detail has proper radiogroup for status', async ({ page }) => {