fix: Complete expense page UI improvements and modal redesign

� UI/UX Improvements:
- Fixed currency display in ExpenseList to show proper currency symbols
- Improved color contrast by using darker grey variants for better visibility
- Updated ExpenseDetailsModal to use modern Vuetify components
- Redesigned PDFOptionsModal with proper Vuetify form elements

✨ Enhanced User Experience:
- Cards now properly display currency with symbols (€, $, etc.)
- Better visual hierarchy with improved contrast ratios
- Smooth transitions and hover effects maintained
- Professional modal designs with consistent spacing

� Technical Fixes:
- Converted all Tailwind CSS to Vuetify components for consistency
- Fixed TypeScript integration issues
- Improved component props and event handling
- Better responsive design for mobile and desktop

� Responsive Design:
- Mobile-optimized expense cards and modals
- Proper grid layouts that adapt to screen sizes
- Touch-friendly interactions on mobile devices

The expense page now has a cohesive, professional design that matches the quality of other dashboard components while maintaining full functionality.

pages/dashboard/expenses.vue

@@ -268,7 +268,6 @@
     <ExpenseDetailsModal
       v-model="showDetailsModal"
       :expense="selectedExpense"
-      @save="handleSaveExpense"
     />
 
     <!-- Create Expense Modal -->