Feat : implement comprehensive notifications system

Features Added

• Complete notification interface with priority levels (urgent/important/informative)
• Menu actions for notification management (mark read, pin, delete)
• Advanced filtering and search functionality
• Detailed notification modal with context and actions
• Settings screen with push/email/SMS preferences and sound controls
• Real-time notification badges and counters

Components Created

• NotificationCard: Swipeable cards with priority indicators
• NotificationFilterBar: Horizontal filter navigation with counts
• NotificationDetailModal: Full-screen modal with action buttons
• NotificationSettingsScreen: Comprehensive preferences management

Technical Implementation

• Zustand store for state management with mock data
• TypeScript interfaces for type safety
• Route structure: /innerApplication/notifications/{index,settings}
• Theme-aware styling with dark/light mode support
• Button component extended with danger variant

Navigation Updates

• Added notification routes to innerApplication layout
• Connected HomeScreen bell icon with dynamic badge
• Integrated notification count display in header"

Closes VSN-1266