🚀 Fix: Remove remaining unused imports to resolve production build failures

frontend/src/pages/invoices/InvoicesPage.tsx

@@ -14,11 +14,9 @@ import {
     CheckCircle2, 
     Clock, 
     AlertCircle, 
-    MoreVertical,
-    ChevronLeft,
-    ChevronRight,
     Building2,
     FileText,
+    ChevronLeft,
     Send,
     Download,
     Trash2,

frontend/src/pages/settings/SettingsPage.tsx

@@ -10,11 +10,9 @@ import {
     User, 
     Lock, 
     Bell, 
-    Globe, 
     Shield, 
     CreditCard, 
     Save, 
-    ChevronLeft, 
     Palette,
     Moon
 } from 'lucide-react';

frontend/src/pages/staff/StaffPage.tsx

@@ -5,7 +5,7 @@
  */
 
 import { useState, useEffect } from 'react';
-import { Users, UserPlus, Search, Shield, Mail, Phone, MoreVertical, Trash2, Loader2, X } from 'lucide-react';
+import { Users, UserPlus, Search, Shield, Mail, MoreVertical, Trash2, Loader2, X } from 'lucide-react';
 import { motion, AnimatePresence } from 'framer-motion';
 import apiClient from '../../api/client';