feat: Implement NotificationsView component for Lendair iOS

- Create NotificationsView.swift with SwiftUI List and pull-to-refresh
- Create NotificationRowView.swift for individual notification items
- Create NotificationsViewModel.swift with MVVM pattern
- Implement empty state view for no notifications
- Add mark-as-read and mark-all-as-read functionality
- Support notification types: loan approved/rejected, payment received/due, new lender, system updates
- Add toolbar action for marking all notifications as read
- Include README.md with architecture documentation and integration guide

Next: Connect tRPC notifications router for data fetching

Lendair/README.md

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+# Lendair iOS Notifications
+
+## Overview
+SwiftUI implementation of the notifications feature for the Lendair iOS app.
+
+## Architecture
+
+### MVVM Pattern
+- **View**: `NotificationsView` - Main container view
+- **ViewModel**: `NotificationsViewModel` - Manages notification state and business logic
+- **Service**: `NotificationsService` - Data layer for API communication
+
+### Components
+
+#### NotificationsView (`Views/NotificationsView.swift`)
+- Main navigation container for the notifications screen
+- Implements pull-to-refresh functionality
+- Handles empty state display
+- Provides "Mark All Read" action in toolbar
+- Integrates with navigation stack
+
+#### NotificationRowView (`Views/NotificationRowView.swift`)
+- Individual notification list item
+- Displays notification icon, title, message, and timestamp
+- Shows read/unread indicator
+- Supports tap-to-mark-as-read interaction
+
+#### NotificationsViewModel (`ViewModels/NotificationsViewModel.swift`)
+- Observable object managing notification state
+- Fetches notifications from service layer
+- Handles mark-as-read and mark-all-as-read operations
+- Calculates unread count for badge display
+- Implements refresh logic
+
+## Notification Types
+
+The app supports the following notification types:
+- `LOAN_APPROVED` - Green checkmark icon
+- `LOAN_REJECTED` - Red X icon
+- `PAYMENT_RECEIVED` - Green down arrow icon
+- `PAYMENT_DUE` - Orange exclamation icon
+- `NEW_LENDER` - Blue person icon
+- `SYSTEM_UPDATE` - Gray info icon
+
+## Integration Points
+
+### tRPC Router (TODO)
+The service layer is designed to connect to the tRPC notifications router:
+```typescript
+// web/src/server/api/routers/notifications.ts
+notifications: router({
+  list: protectedQuery(...),
+  markAsRead: protectedMutation(...),
+  markAllAsRead: protectedMutation(...),
+})
+```
+
+### API Endpoints (TODO)
+- `GET /api/notifications` - List notifications
+- `PATCH /api/notifications/:id/read` - Mark single as read
+- `PATCH /api/notifications/read-all` - Mark all as read
+
+## Usage
+
+```swift
+// In your MainTabView or navigation stack
+NavigationStack {
+    NotificationsView()
+}
+```
+
+## Testing
+
+Run the preview in Xcode to see the notification row designs:
+```swift
+#Preview {
+    NotificationRowView(notification: sampleNotification)
+}
+```
+
+## Future Enhancements
+
+1. **Push Notifications**: Integrate with UNUserNotificationCenter
+2. **Notification Preferences**: Allow users to customize notification types
+3. **Deep Linking**: Navigate to relevant screens when tapping notifications
+4. **Offline Support**: Cache notifications locally with Core Data
+5. **Analytics**: Track notification engagement metrics