feat: add notifications page and update navigation to redirect notifications to a dedicated route

src/app/investor/dashboard/page.tsx

@@ -14,7 +14,7 @@ export default function InvestorDashboardPage() {
   return (
     <div className="min-h-screen lg:pt-6 pt-0">
       <InvestorNotification isMobile />
-      <div className="pt-18 lg:pt-0 p-4 lg:p-6 max-w-8xl mx-auto mb-20 lg:mb-0">
+      <div className="pt-18 lg:pt-0 p-4 lg:p-6 max-w-8xl mx-auto mb-12 lg:mb-0">
         <div className="flex flex-col lg:flex-row lg:items-center justify-between gap-4 mb-6">
           <div>
             <h1 className="text-xl lg:text-2xl font-extrabold text-slate-800">Welcome back, {investor.name.split(' ')[0]} 👋</h1>