refactor: remove investor portfolio and withdrawal pages and clean up related sidebar and admin navigation links.

src/components/Sidebar.tsx

@@ -65,8 +65,6 @@ const bikerNavItems = [
 
 const investorNavItems = [
   { label: 'Dashboard', href: '/investor', icon: Wallet },
-  { label: 'Portfolio', href: '/investor/portfolio', icon: BarChart3 },
-  { label: 'Withdraw', href: '/investor/withdraw', icon: CreditCard },
 ];
 
 const shopNavItems = [
@@ -132,7 +130,7 @@ export default function Sidebar() {
               <div className="px-2 py-1 bg-accent-light rounded text-xs font-semibold text-accent">
                 {roleLabel}
               </div>
-              <button 
+              <button
                 onClick={() => setMobileOpen(false)}
                 className="lg:hidden p-1 text-slate-400 hover:text-slate-600 rounded-lg hover:bg-slate-100"
               >
@@ -175,7 +173,7 @@ export default function Sidebar() {
               <p className="text-sm font-medium text-slate-700 truncate">{userName}</p>
               <p className="text-xs text-slate-400">{roleLabel}</p>
             </div>
-            <button 
+            <button
               onClick={() => {
                 logout();
                 window.location.href = '/login';