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

src/app/investor/investments/[id]/page.tsx

@@ -7,7 +7,7 @@ import {
   ArrowLeft, TrendingUp, Bike, DollarSign, Calendar,
   CreditCard, FileText, Download, Check,
   Printer, BarChart3, Wallet, Clock, Shield, Percent, Activity, AlertTriangle,
-  Receipt, CreditCardIcon, Zap, Smartphone, ChevronRight
+  Receipt, CreditCardIcon, Zap, Smartphone, ChevronRight, Target
 } from 'lucide-react';
 import { investors, bikes, transactions } from '@/data/mockData';
 import toast from 'react-hot-toast';
@@ -57,7 +57,8 @@ export default function InvestorInvestmentDetailPage({ params }: { params: Promi
           </button>
           <div>
             <div className="flex items-center gap-3">
-              <h1 className="text-xl lg:text-2xl font-extrabold text-slate-800">{investment.planName}</h1>
+              <h1 className="text-xl lg:text-2xl font-extrabold text-slate-800 flex items-center gap-2">
+                <Target className="w-5 h-5 lg:w-6 lg:h-6 text-investor" />{investment.planName}</h1>
               <span className={`px-2.5 py-1 rounded-full text-xs font-bold ${style.badge} capitalize`}>
                 {investment.planType} Plan
               </span>