feat: Modularize event management system - 98.7% reduction in main file size

BREAKING CHANGES:
- Refactored monolithic manage.astro (7,623 lines) into modular architecture
- Original file backed up as manage-old.astro

NEW ARCHITECTURE:
✅ 5 Utility Libraries:
  - event-management.ts: Event data operations & formatting
  - ticket-management.ts: Ticket CRUD operations & sales data
  - seating-management.ts: Seating map management & layout generation
  - sales-analytics.ts: Sales metrics, reporting & data export
  - marketing-kit.ts: Marketing asset generation & social media

✅ 5 Shared Components:
  - TicketTypeModal.tsx: Reusable ticket type creation/editing
  - SeatingMapModal.tsx: Advanced seating map editor with drag-and-drop
  - EmbedCodeModal.tsx: Widget embedding with customization
  - OrdersTable.tsx: Comprehensive orders table with sorting/pagination
  - AttendeesTable.tsx: Attendee management with export capabilities

✅ 11 Tab Components:
  - TicketsTab.tsx: Ticket management with card/list views
  - VenueTab.tsx: Seating map management & venue configuration
  - OrdersTab.tsx: Sales data & order management
  - AttendeesTab.tsx: Attendee check-in & management
  - PresaleTab.tsx: Presale code generation & tracking
  - DiscountTab.tsx: Discount code management
  - AddonsTab.tsx: Add-on product management
  - PrintedTab.tsx: Printed ticket barcode management
  - SettingsTab.tsx: Event configuration & custom fields
  - MarketingTab.tsx: Marketing kit with social media templates
  - PromotionsTab.tsx: Campaign & promotion management

✅ 4 Infrastructure Components:
  - TabNavigation.tsx: Responsive tab navigation system
  - EventManagement.tsx: Main orchestration component
  - EventHeader.astro: Event information header
  - QuickStats.astro: Statistics dashboard

BENEFITS:
- 98.7% reduction in main file size (7,623 → ~100 lines)
- Dramatic improvement in maintainability and team collaboration
- Component-level testing now possible
- Reusable components across multiple features
- Lazy loading support for better performance
- Full TypeScript support with proper interfaces
- Separation of concerns: business logic separated from UI

🤖 Generated with [Claude Code](https://claude.ai/code)

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

MANAGE_MODULARIZATION_PLAN.md

@@ -0,0 +1,54 @@
+# Event Management Page Modularization Plan
+
+## Current State Analysis
+The `/src/pages/events/[id]/manage.astro` file is **7,623 lines** and **333KB** - too large for maintainability.
+
+## Proposed Modular Structure
+
+### 1. Core Page Structure
+- **`manage.astro`** (200-300 lines) - Main layout, navigation, tab structure
+- **`components/EventHeader.astro`** - Event title, actions, preview buttons
+- **`components/TabNavigation.astro`** - Tab switching UI
+
+### 2. Tab Components (React Islands)
+- **`components/manage/TicketsTab.tsx`** - Ticket types management
+- **`components/manage/VenueTab.tsx`** - Seating maps and venue setup
+- **`components/manage/OrdersTab.tsx`** - Sales data and order management
+- **`components/manage/AttendeesTab.tsx`** - Attendee list and check-in
+- **`components/manage/PresaleTab.tsx`** - Presale codes management
+- **`components/manage/DiscountTab.tsx`** - Discount codes
+- **`components/manage/AddonsTab.tsx`** - Add-on items
+- **`components/manage/PrintedTab.tsx`** - Printed tickets
+- **`components/manage/SettingsTab.tsx`** - Event settings
+- **`components/manage/MarketingTab.tsx`** - Marketing kit generation
+- **`components/manage/PromotionsTab.tsx`** - Promotions and campaigns
+
+### 3. Utility Libraries
+- **`lib/event-management.ts`** - Event data loading/updating
+- **`lib/ticket-management.ts`** - Ticket type operations
+- **`lib/seating-management.ts`** - Seating map operations
+- **`lib/sales-analytics.ts`** - Sales data processing
+- **`lib/marketing-kit.ts`** - Marketing content generation
+
+### 4. Shared Components
+- **`components/modals/TicketTypeModal.tsx`** - Ticket type creation/editing
+- **`components/modals/SeatingMapModal.tsx`** - Seating map management
+- **`components/modals/EmbedCodeModal.tsx`** - Embed code display
+- **`components/tables/OrdersTable.tsx`** - Reusable orders table
+- **`components/tables/AttendeesTable.tsx`** - Reusable attendees table
+
+### 5. Benefits
+- **Maintainability**: Each component ~200-500 lines
+- **Reusability**: Shared components across features
+- **Performance**: Lazy loading of tab content
+- **Testing**: Isolated component testing
+- **Collaboration**: Multiple developers can work simultaneously
+
+### 6. Migration Strategy
+1. Extract utility functions to lib files
+2. Create shared modal components
+3. Convert each tab to React component
+4. Update main page to use new components
+5. Test each tab independently
+
+Would you like me to proceed with this modularization plan?