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>

backend/prisma/migrations/20260201095359_add_signal_messages/migration.sql

@@ -0,0 +1,27 @@
+-- CreateEnum
+CREATE TYPE "MessageDirection" AS ENUM ('INBOUND', 'OUTBOUND');
+
+-- CreateTable
+CREATE TABLE "signal_messages" (
+    "id" TEXT NOT NULL,
+    "driverId" TEXT NOT NULL,
+    "direction" "MessageDirection" NOT NULL,
+    "content" TEXT NOT NULL,
+    "timestamp" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "isRead" BOOLEAN NOT NULL DEFAULT false,
+    "signalTimestamp" TEXT,
+
+    CONSTRAINT "signal_messages_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "signal_messages_driverId_idx" ON "signal_messages"("driverId");
+
+-- CreateIndex
+CREATE INDEX "signal_messages_driverId_isRead_idx" ON "signal_messages"("driverId", "isRead");
+
+-- CreateIndex
+CREATE INDEX "signal_messages_timestamp_idx" ON "signal_messages"("timestamp");
+
+-- AddForeignKey
+ALTER TABLE "signal_messages" ADD CONSTRAINT "signal_messages_driverId_fkey" FOREIGN KEY ("driverId") REFERENCES "drivers"("id") ON DELETE CASCADE ON UPDATE CASCADE;

backend/prisma/migrations/20260201132408_add_pdf_settings/migration.sql

@@ -0,0 +1,32 @@
+-- CreateEnum
+CREATE TYPE "PageSize" AS ENUM ('LETTER', 'A4');
+
+-- CreateTable
+CREATE TABLE "pdf_settings" (
+    "id" TEXT NOT NULL,
+    "organizationName" TEXT NOT NULL DEFAULT 'VIP Coordinator',
+    "logoUrl" TEXT,
+    "accentColor" TEXT NOT NULL DEFAULT '#2c3e50',
+    "tagline" TEXT,
+    "contactEmail" TEXT NOT NULL DEFAULT 'contact@example.com',
+    "contactPhone" TEXT NOT NULL DEFAULT '555-0100',
+    "secondaryContactName" TEXT,
+    "secondaryContactPhone" TEXT,
+    "contactLabel" TEXT NOT NULL DEFAULT 'Questions or Changes?',
+    "showDraftWatermark" BOOLEAN NOT NULL DEFAULT false,
+    "showConfidentialWatermark" BOOLEAN NOT NULL DEFAULT false,
+    "showTimestamp" BOOLEAN NOT NULL DEFAULT true,
+    "showAppUrl" BOOLEAN NOT NULL DEFAULT false,
+    "pageSize" "PageSize" NOT NULL DEFAULT 'LETTER',
+    "showFlightInfo" BOOLEAN NOT NULL DEFAULT true,
+    "showDriverNames" BOOLEAN NOT NULL DEFAULT true,
+    "showVehicleNames" BOOLEAN NOT NULL DEFAULT true,
+    "showVipNotes" BOOLEAN NOT NULL DEFAULT true,
+    "showEventDescriptions" BOOLEAN NOT NULL DEFAULT true,
+    "headerMessage" TEXT,
+    "footerMessage" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "pdf_settings_pkey" PRIMARY KEY ("id")
+);

backend/prisma/migrations/20260201151046_add_reminder_tracking/migration.sql

@@ -0,0 +1,3 @@
+-- AlterTable
+ALTER TABLE "schedule_events" ADD COLUMN     "reminder20MinSent" BOOLEAN NOT NULL DEFAULT false,
+ADD COLUMN     "reminder5MinSent" BOOLEAN NOT NULL DEFAULT false;

backend/prisma/migrations/20260201152207_make_driver_phone_optional/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "drivers" ALTER COLUMN "phone" DROP NOT NULL;