feat: comprehensive update with Signal, Copilot, themes, and PDF features

## Signal Messaging Integration
- Added SignalService for sending messages to drivers via Signal
- SignalMessage model for tracking message history
- Driver chat modal for real-time messaging
- Send schedule via Signal (ICS + PDF attachments)

## AI Copilot
- Natural language interface for VIP Coordinator
- Capabilities: create VIPs, schedule events, assign drivers
- Help and guidance for users
- Floating copilot button in UI

## Theme System
- Dark/light/system theme support
- Color scheme selection (blue, green, purple, orange, red)
- ThemeContext for global state
- AppearanceMenu in header

## PDF Schedule Export
- VIPSchedulePDF component for schedule generation
- PDF settings (header, footer, branding)
- Preview PDF in browser
- Settings stored in database

## Database Migrations
- add_signal_messages: SignalMessage model
- add_pdf_settings: Settings model for PDF config
- add_reminder_tracking: lastReminderSent for events
- make_driver_phone_optional: phone field nullable

## Event Management
- Event status service for automated updates
- IN_PROGRESS/COMPLETED status tracking
- Reminder tracking for notifications

## UI/UX Improvements
- Driver schedule modal
- Improved My Schedule page
- Better error handling and loading states
- Responsive design improvements

## Other Changes
- AGENT_TEAM.md documentation
- Seed data improvements
- Ability factory updates
- Driver profile page

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

frontend/src/components/ErrorBoundary.tsx

@@ -48,19 +48,19 @@ export class ErrorBoundary extends Component<Props, State> {
   render() {
     if (this.state.hasError) {
       return (
-        <div className="min-h-screen bg-gray-50 flex items-center justify-center p-4">
-          <div className="max-w-md w-full bg-white rounded-lg shadow-xl p-8">
+        <div className="min-h-screen bg-muted flex items-center justify-center p-4">
+          <div className="max-w-md w-full bg-card rounded-lg shadow-xl p-8">
             <div className="flex justify-center mb-6">
               <div className="rounded-full bg-red-100 p-4">
                 <AlertTriangle className="h-12 w-12 text-red-600" />
               </div>
             </div>
 
-            <h1 className="text-2xl font-bold text-gray-900 text-center mb-4">
+            <h1 className="text-2xl font-bold text-foreground text-center mb-4">
               Something went wrong
             </h1>
 
-            <p className="text-gray-600 text-center mb-6">
+            <p className="text-muted-foreground text-center mb-6">
               The application encountered an unexpected error. Please try refreshing the page or returning to the home page.
             </p>
 
@@ -87,7 +87,7 @@ export class ErrorBoundary extends Component<Props, State> {
               </button>
               <button
                 onClick={this.handleGoHome}
-                className="flex-1 inline-flex items-center justify-center px-4 py-2 border border-gray-300 text-sm font-medium rounded-md text-gray-700 bg-white hover:bg-gray-50"
+                className="flex-1 inline-flex items-center justify-center px-4 py-2 border border-input text-sm font-medium rounded-md text-foreground bg-card hover:bg-accent"
               >
                 <Home className="h-4 w-4 mr-2" />
                 Go Home