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/hooks/useSettings.ts

@@ -0,0 +1,74 @@
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
+import { api } from '../lib/api';
+import { PdfSettings, UpdatePdfSettingsDto } from '../types/settings';
+
+/**
+ * Fetch PDF settings
+ */
+export function usePdfSettings() {
+  return useQuery<PdfSettings>({
+    queryKey: ['settings', 'pdf'],
+    queryFn: async () => {
+      const { data } = await api.get('/settings/pdf');
+      return data;
+    },
+  });
+}
+
+/**
+ * Update PDF settings
+ */
+export function useUpdatePdfSettings() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (dto: UpdatePdfSettingsDto) => {
+      const { data } = await api.patch('/settings/pdf', dto);
+      return data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['settings', 'pdf'] });
+    },
+  });
+}
+
+/**
+ * Upload logo
+ */
+export function useUploadLogo() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (file: File) => {
+      const formData = new FormData();
+      formData.append('logo', file);
+
+      const { data } = await api.post('/settings/pdf/logo', formData, {
+        headers: {
+          'Content-Type': 'multipart/form-data',
+        },
+      });
+      return data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['settings', 'pdf'] });
+    },
+  });
+}
+
+/**
+ * Delete logo
+ */
+export function useDeleteLogo() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async () => {
+      const { data } = await api.delete('/settings/pdf/logo');
+      return data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['settings', 'pdf'] });
+    },
+  });
+}