style: standardize header icons and update sidebar navigation labels and icons

src/app/investor/withdraw/page.tsx

@@ -111,7 +111,9 @@ export default function InvestorWithdrawPage() {
       {/* Header */}
       <div className="mb-6 flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4">
         <div>
-          <h1 className="text-xl lg:text-2xl font-bold text-slate-800">Withdraw Funds</h1>
+          <h1 className="text-xl lg:text-2xl font-bold text-slate-800 flex items-center gap-2">
+            <CreditCard className="w-5 h-5 lg:w-6 lg:h-6 text-investor" /> Withdraw Funds
+          </h1>
           <p className="text-sm text-slate-500 mt-1">Request withdrawals to your bank or mobile banking accounts</p>
         </div>
         <button