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

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+/**
+ * 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;
+  }
+}

src/components/common/LoadingSpinner.tsx

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+/**
+ * Loading Spinner Component
+ * Displays a spinning loader animation
+ */
+import { Loader2 } from 'lucide-react';
+import { cn } from '@/lib/utils';
+
+interface LoadingSpinnerProps {
+  size?: 'sm' | 'md' | 'lg';
+  className?: string;
+}
+
+const sizeClasses = {
+  sm: 'h-4 w-4',
+  md: 'h-8 w-8',
+  lg: 'h-12 w-12',
+};
+
+export function LoadingSpinner({ size = 'md', className }: LoadingSpinnerProps) {
+  return (
+    <div className={cn('flex items-center justify-center', className)}>
+      <Loader2 className={cn('animate-spin text-primary', sizeClasses[size])} />
+    </div>
+  );
+}
+
+/**
+ * Full page loading spinner
+ */
+export function PageLoader() {
+  return (
+    <div className="flex h-full items-center justify-center">
+      <LoadingSpinner size="lg" />
+    </div>
+  );
+}

src/components/common/StatusBadge.tsx

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+/**
+ * Status Badge Component
+ * Displays connection/state status with color coding
+ */
+import { cn } from '@/lib/utils';
+import { Badge } from '@/components/ui/badge';
+
+type Status = 'connected' | 'disconnected' | 'connecting' | 'error' | 'running' | 'stopped' | 'starting';
+
+interface StatusBadgeProps {
+  status: Status;
+  label?: string;
+  showDot?: boolean;
+}
+
+const statusConfig: Record<Status, { label: string; variant: 'success' | 'secondary' | 'warning' | 'destructive' }> = {
+  connected: { label: 'Connected', variant: 'success' },
+  running: { label: 'Running', variant: 'success' },
+  disconnected: { label: 'Disconnected', variant: 'secondary' },
+  stopped: { label: 'Stopped', variant: 'secondary' },
+  connecting: { label: 'Connecting', variant: 'warning' },
+  starting: { label: 'Starting', variant: 'warning' },
+  error: { label: 'Error', variant: 'destructive' },
+};
+
+export function StatusBadge({ status, label, showDot = true }: StatusBadgeProps) {
+  const config = statusConfig[status];
+  const displayLabel = label || config.label;
+  
+  return (
+    <Badge variant={config.variant} className="gap-1.5">
+      {showDot && (
+        <span
+          className={cn(
+            'h-1.5 w-1.5 rounded-full',
+            config.variant === 'success' && 'bg-green-600',
+            config.variant === 'secondary' && 'bg-gray-400',
+            config.variant === 'warning' && 'bg-yellow-600 animate-pulse',
+            config.variant === 'destructive' && 'bg-red-600'
+          )}
+        />
+      )}
+      {displayLabel}
+    </Badge>
+  );
+}