test(frontend): update tests for type changes

Update all test files to use correct enum values:
- AgentPanel, AgentStatusIndicator tests
- ProjectHeader, StatusBadge tests
- IssueSummary, IssueTable tests
- StatusBadge, StatusWorkflow tests (issues)

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

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

frontend/tests/components/projects/AgentPanel.test.tsx

@@ -10,7 +10,7 @@ const mockAgents: AgentInstance[] = [
     project_id: 'proj-001',
     name: 'Product Owner',
     role: 'product_owner',
-    status: 'active',
+    status: 'working',
     current_task: 'Reviewing user stories',
     last_activity_at: new Date().toISOString(),
     spawned_at: '2025-01-15T00:00:00Z',