test(frontend): comprehensive test coverage improvements and bug fixes

- Raise coverage thresholds to 90% statements/lines/functions, 85% branches
- Add comprehensive tests for ProjectDashboard, ProjectWizard, and all wizard steps
- Add tests for issue management: IssueDetailPanel, BulkActions, IssueFilters
- Expand IssueTable tests with keyboard navigation, dropdown menu, edge cases
- Add useIssues hook tests covering all mutations and optimistic updates
- Expand eventStore tests with selector hooks and additional scenarios
- Expand useProjectEvents tests with error recovery, ping events, edge cases
- Add PriorityBadge, StatusBadge, SyncStatusIndicator fallback branch tests
- Add constants.test.ts for comprehensive constant validation

Bug fixes:
- Fix false positive rollback test to properly verify onMutate context setup
- Replace deprecated substr() with substring() in mock helpers
- Fix type errors: ProjectComplexity, ClientMode enum values
- Fix unused imports and variables across test files
- Fix @ts-expect-error directives and method override signatures

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

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

frontend/tests/features/issues/components/StatusBadge.test.tsx

@@ -45,4 +45,27 @@ describe('StatusBadge', () => {
     // Should have sr-only text for screen readers
     expect(screen.getByText('Open')).toBeInTheDocument();
   });
+
+  it('falls back to open config for unknown status', () => {
+    // @ts-expect-error - Testing unknown status value
+    render(<StatusBadge status="unknown-status" />);
+
+    // Should fall back to open config (includes CircleDot icon as default)
+    const elements = screen.getAllByText('Open');
+    expect(elements.length).toBeGreaterThanOrEqual(1);
+  });
+
+  it('renders done status correctly', () => {
+    // Test the 'done' status which has a valid icon mapping
+    // but STATUS_CONFIG doesn't have 'done', so it falls back to 'open'
+    // @ts-expect-error - Testing done status (valid icon, fallback config)
+    const { container } = render(<StatusBadge status="done" />);
+
+    // Should have an SVG icon rendered (CheckCircle2 for done)
+    const svg = container.querySelector('svg');
+    expect(svg).toBeInTheDocument();
+
+    // Config falls back to open, so label shows "Open"
+    expect(screen.getAllByText('Open').length).toBeGreaterThan(0);
+  });
 });