refactor: remove unused UI components and icons across multiple pages

src/components/layout/Header.tsx

@@ -1,7 +1,6 @@
 import { useState, useRef, useEffect } from 'react';
 import { useNavigate } from 'react-router-dom';
-import { Search, ChevronDown, Menu, LogOut, User, ChevronRight } from 'lucide-react';
-import { Button } from '@/components/ui/button';
+import { ChevronDown, Menu, LogOut, User, ChevronRight } from 'lucide-react';
 import { useAppDispatch, useAppSelector } from '@/hooks/redux-hooks';
 import { logoutAsync } from '@/store/authSlice';
 import { cn } from '@/lib/utils';

src/pages/superadmin/Modules.tsx

@@ -10,7 +10,7 @@ import {
   type Column,
 } from '@/components/shared';
 import { ViewModuleModal, NewModuleModal } from '@/components/superadmin';
-import { Plus, Download, ArrowUpDown } from 'lucide-react';
+import { Plus, ArrowUpDown } from 'lucide-react';
 import { moduleService } from '@/services/module-service';
 import type { Module } from '@/types/module';
 

src/pages/superadmin/Tenants.tsx

@@ -12,7 +12,7 @@ import {
   type Column,
 } from '@/components/shared';
 // Note: NewTenantModal, ViewTenantModal, EditTenantModal are now in @/components/superadmin (commented out - using wizard/details/edit pages instead)
-import { Plus, Download, ArrowUpDown } from 'lucide-react';
+import { Plus, ArrowUpDown } from 'lucide-react';
 import { useNavigate } from 'react-router-dom';
 import { tenantService } from '@/services/tenant-service';
 import type { Tenant } from '@/types/tenant';

src/pages/tenant/Dashboard.tsx

@@ -4,7 +4,6 @@ import {
   FileCheck,
   Briefcase,
   FileText,
-  GraduationCap,
   Users,
   Bell,
 } from "lucide-react";

src/pages/tenant/FilesList.tsx

@@ -24,7 +24,6 @@ import {
   Eye,
   Pencil,
   Trash2,
-  SlidersHorizontal,
   ChevronDown,
 } from "lucide-react";
 import { Layout } from "@/components/layout/Layout";

src/pages/tenant/Roles.tsx

@@ -13,7 +13,7 @@ import {
   FilterDropdown,
   type Column,
 } from '@/components/shared';
-import { Plus, Download, ArrowUpDown } from 'lucide-react';
+import { Plus, ArrowUpDown } from 'lucide-react';
 import { roleService } from '@/services/role-service';
 import type { Role, CreateRoleRequest, UpdateRoleRequest } from '@/types/role';
 import { showToast } from '@/utils/toast';

src/pages/tenant/Users.tsx

@@ -14,7 +14,7 @@ import {
   FilterDropdown,
   type Column,
 } from "@/components/shared";
-import { Plus, Download, ArrowUpDown } from "lucide-react";
+import { Plus, ArrowUpDown } from "lucide-react";
 import { userService } from "@/services/user-service";
 import type { User } from "@/types/user";
 import { showToast } from "@/utils/toast";