Fix member management issues and add refined view

- Sort dues management cards alphabetically by last name
- Change 'Invalid Date' display to 'N/A' in formatDate functions
- Add new refined member management view with modern UI design
  - Glassmorphism effects and gradient accents
  - Enhanced stat cards with progress indicators
  - Improved search and filter interface
  - Better card and table layouts
  - Smooth animations and transitions

🤖 Generated with Claude Code

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

components/BoardDuesManagement.vue

@@ -150,8 +150,21 @@ const loadDuesData = async () => {
     }>('/api/members/dues-status');
 
     if (response.success) {
-      overdueMembers.value = response.data.overdue || [];
-      upcomingMembers.value = response.data.upcoming || [];
+      // Sort members alphabetically by last name, then first name
+      const sortByName = (a: Member, b: Member) => {
+        const aLastName = (a.last_name || '').toLowerCase();
+        const bLastName = (b.last_name || '').toLowerCase();
+        const aFirstName = (a.first_name || '').toLowerCase();
+        const bFirstName = (b.first_name || '').toLowerCase();
+        
+        const lastNameCompare = aLastName.localeCompare(bLastName);
+        if (lastNameCompare !== 0) return lastNameCompare;
+        
+        return aFirstName.localeCompare(bFirstName);
+      };
+      
+      overdueMembers.value = (response.data.overdue || []).sort(sortByName);
+      upcomingMembers.value = (response.data.upcoming || []).sort(sortByName);
     }
   } catch (error) {
     console.error('Error loading dues data:', error);

components/ViewMemberDialog.vue

@@ -570,8 +570,10 @@ const getMembershipColor = (type: string) => {
 };
 
 const formatDate = (date: string) => {
-  if (!date) return null;
-  return new Date(date).toLocaleDateString('en-US', {
+  if (!date) return 'N/A';
+  const parsedDate = new Date(date);
+  if (isNaN(parsedDate.getTime())) return 'N/A';
+  return parsedDate.toLocaleDateString('en-US', {
     month: 'long',
     day: 'numeric',
     year: 'numeric'