feat(tests): implement test runner functionality with API integration

- Added Test Runner Service to manage test execution processes for worktrees.
- Introduced endpoints for starting and stopping tests, and retrieving test logs.
- Created UI components for displaying test logs and managing test sessions.
- Integrated test runner events for real-time updates in the UI.
- Updated project settings to include configurable test commands.

This enhancement allows users to run tests directly from the UI, view logs in real-time, and manage test sessions effectively.

apps/ui/src/components/views/project-settings-view/config/navigation.ts

@@ -1,5 +1,5 @@
 import type { LucideIcon } from 'lucide-react';
-import { User, GitBranch, Palette, AlertTriangle, Workflow } from 'lucide-react';
+import { User, GitBranch, Palette, AlertTriangle, Workflow, FlaskConical } from 'lucide-react';
 import type { ProjectSettingsViewId } from '../hooks/use-project-settings-view';
 
 export interface ProjectNavigationItem {
@@ -11,6 +11,7 @@ export interface ProjectNavigationItem {
 export const PROJECT_SETTINGS_NAV_ITEMS: ProjectNavigationItem[] = [
   { id: 'identity', label: 'Identity', icon: User },
   { id: 'worktrees', label: 'Worktrees', icon: GitBranch },
+  { id: 'testing', label: 'Testing', icon: FlaskConical },
   { id: 'theme', label: 'Theme', icon: Palette },
   { id: 'claude', label: 'Models', icon: Workflow },
   { id: 'danger', label: 'Danger Zone', icon: AlertTriangle },