feat: implement complete invoicing application with CSV import and PDF export

- Add comprehensive CSV import system with drag-and-drop upload and validation
- Create UniversalTable component with advanced filtering, searching, and batch actions
- Implement invoice management (view, edit, delete) with professional PDF export
- Add client management with full CRUD operations
- Set up authentication with NextAuth.js and email/password login
- Configure database schema with users, clients, invoices, and invoice_items tables
- Build responsive UI with shadcn/ui components and emerald branding
- Add type-safe API layer with tRPC and Zod validation
- Include proper error handling and user feedback with toast notifications
- Set up development environment with Bun, TypeScript, and Tailwind CSS

src/app/dashboard/layout.tsx

@@ -0,0 +1,18 @@
+import { Navbar } from "~/components/Navbar";
+import { Sidebar } from "~/components/Sidebar";
+import { DashboardBreadcrumbs } from "~/components/dashboard-breadcrumbs";
+
+export default function DashboardLayout({ children }: { children: React.ReactNode }) {
+  return (
+    <>
+      <Navbar />
+      <Sidebar />
+      <main className="min-h-screen pt-24 ml-70">
+        <div className="px-8 pt-6 pb-6">
+          <DashboardBreadcrumbs />
+          {children}
+        </div>
+      </main>
+    </>
+  );
+}