Enhance duplicate detection with sales/admin access and field updates

- Extend duplicate detection access from admin-only to sales/admin users
- Update field names for better clarity (Email → Email Address, etc.)
- Add duplicate notification banner to expenses page
- Improve authorization checks with role-based access control

components/DuplicateNotificationBanner.vue

@@ -35,16 +35,20 @@
 </template>
 
 <script setup>
-const { isAdmin } = useAuthorization();
+const { hasRole } = useAuthorization();
 
 const showBanner = ref(true);
 const duplicateCount = ref(0);
 const loading = ref(false);
 
-// Check for duplicates on mount (any authenticated user)
+// Check for duplicates on mount (sales/admin users)
 const checkForDuplicates = async () => {
   if (loading.value) return;
   
+  // Only check for users with sales or admin role
+  const canViewDuplicates = await hasRole(['sales', 'admin']);
+  if (!canViewDuplicates) return;
+  
   try {
     loading.value = true;
     const response = await $fetch('/api/admin/duplicates/find', {

components/ExpenseDuplicateNotificationBanner.vue

@@ -0,0 +1,101 @@
+<template>
+  <v-alert
+    v-if="showBanner && (duplicateCount > 0 || payerVariations > 0)"
+    type="warning"
+    variant="tonal"
+    closable
+    @click:close="dismissBanner"
+    class="ma-4"
+  >
+    <template #prepend>
+      <v-icon>mdi-content-duplicate</v-icon>
+    </template>
+    
+    <div class="d-flex align-center justify-space-between">
+      <div>
+        <div class="text-subtitle-1 font-weight-medium">
+          <span v-if="duplicateCount > 0">
+            {{ duplicateCount }} duplicate expense{{ duplicateCount > 1 ? 's' : '' }} detected
+          </span>
+          <span v-if="duplicateCount > 0 && payerVariations > 0"> and </span>
+          <span v-if="payerVariations > 0">
+            {{ payerVariations }} payer name variation{{ payerVariations > 1 ? 's' : '' }} found
+          </span>
+        </div>
+        <div class="text-body-2">
+          Duplicate expenses and inconsistent payer names can affect reporting accuracy.
+        </div>
+      </div>
+      
+      <v-btn
+        color="warning"
+        variant="elevated"
+        size="small"
+        :to="'/dashboard/expenses/duplicates'"
+        prepend-icon="mdi-wrench"
+      >
+        Clean Up Duplicates
+      </v-btn>
+    </div>
+  </v-alert>
+</template>
+
+<script setup>
+const { hasRole } = useAuthorization();
+
+const showBanner = ref(true);
+const duplicateCount = ref(0);
+const payerVariations = ref(0);
+const loading = ref(false);
+
+// Check for duplicates on mount (only for sales/admin users)
+const checkForDuplicates = async () => {
+  if (loading.value) return;
+  
+  // Only check for users with sales or admin role
+  const canViewExpenses = await hasRole(['sales', 'admin']);
+  if (!canViewExpenses) return;
+  
+  try {
+    loading.value = true;
+    const response = await $fetch('/api/expenses/duplicates/find', {
+      method: 'GET',
+      query: { dateRange: '30' } // Last 30 days
+    });
+    
+    if (response.success && response.data) {
+      duplicateCount.value = response.data.duplicateGroups?.length || 0;
+      payerVariations.value = response.data.payerVariations?.length || 0;
+    }
+  } catch (error) {
+    console.error('[ExpenseDuplicateNotification] Failed to check for duplicates:', error);
+    // Silently fail - this is just a notification banner
+  } finally {
+    loading.value = false;
+  }
+};
+
+// Dismiss the banner for this session
+const dismissBanner = () => {
+  showBanner.value = false;
+  // Store dismissal in session storage
+  if (process.client) {
+    sessionStorage.setItem('expense-duplicates-banner-dismissed', 'true');
+  }
+};
+
+// Check if banner was already dismissed this session
+onMounted(() => {
+  if (process.client) {
+    const dismissed = sessionStorage.getItem('expense-duplicates-banner-dismissed');
+    if (dismissed === 'true') {
+      showBanner.value = false;
+      return;
+    }
+  }
+  
+  // Check for duplicates for sales/admin users
+  // Small delay to let other components load first
+  setTimeout(checkForDuplicates, 2000);
+});
+</script>