feat(core): initialize project skeleton with Electron + React + TypeScript

Set up the complete project foundation for ClawX, a graphical AI assistant:

- Electron main process with IPC handlers, menu, tray, and gateway management
- React renderer with routing, layout components, and page scaffolding
- Zustand state management for gateway, settings, channels, skills, chat, and cron
- shadcn/ui components with Tailwind CSS and CSS variable theming
- Build tooling with Vite, electron-builder, and TypeScript configuration
- Testing setup with Vitest and Playwright
- Development configurations (ESLint, Prettier, gitignore, env example)

src/components/common/ErrorBoundary.tsx

@@ -0,0 +1,74 @@
+/**
+ * Error Boundary Component
+ * Catches and displays errors in the component tree
+ */
+import { Component, ReactNode } from 'react';
+import { AlertTriangle, RefreshCw } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
+
+interface Props {
+  children: ReactNode;
+  fallback?: ReactNode;
+}
+
+interface State {
+  hasError: boolean;
+  error: Error | null;
+}
+
+export class ErrorBoundary extends Component<Props, State> {
+  constructor(props: Props) {
+    super(props);
+    this.state = { hasError: false, error: null };
+  }
+  
+  static getDerivedStateFromError(error: Error): State {
+    return { hasError: true, error };
+  }
+  
+  componentDidCatch(error: Error, errorInfo: React.ErrorInfo) {
+    console.error('Error caught by boundary:', error, errorInfo);
+  }
+  
+  handleReset = () => {
+    this.setState({ hasError: false, error: null });
+  };
+  
+  render() {
+    if (this.state.hasError) {
+      if (this.props.fallback) {
+        return this.props.fallback;
+      }
+      
+      return (
+        <div className="flex h-full items-center justify-center p-6">
+          <Card className="max-w-md">
+            <CardHeader>
+              <div className="flex items-center gap-2">
+                <AlertTriangle className="h-6 w-6 text-destructive" />
+                <CardTitle>Something went wrong</CardTitle>
+              </div>
+              <CardDescription>
+                An unexpected error occurred. Please try again.
+              </CardDescription>
+            </CardHeader>
+            <CardContent className="space-y-4">
+              {this.state.error && (
+                <pre className="rounded-lg bg-muted p-4 text-sm overflow-auto max-h-40">
+                  {this.state.error.message}
+                </pre>
+              )}
+              <Button onClick={this.handleReset} className="w-full">
+                <RefreshCw className="mr-2 h-4 w-4" />
+                Try Again
+              </Button>
+            </CardContent>
+          </Card>
+        </div>
+      );
+    }
+    
+    return this.props.children;
+  }
+}