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

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

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

frontend/e2e/global.d.ts

@@ -0,0 +1,18 @@
+/**
+ * Global type declarations for E2E tests
+ */
+
+declare global {
+  interface Window {
+    __TEST_AUTH_STORE__?: {
+      getState: () => {
+        isAuthenticated: boolean;
+        user: { id: string; email: string; is_superuser: boolean } | null;
+        accessToken: string | null;
+        refreshToken: string | null;
+      };
+    };
+  }
+}
+
+export {};