add initial dashboard page

internal/ui/pages/app_dashboard.templ

@@ -0,0 +1,16 @@
+package pages
+
+import "git.juancwu.dev/juancwu/budgit/internal/ui/layouts"
+
+templ Dashboard() {
+	@layouts.App("Dashboard") {
+		<div class="container max-w-7xl px-6 py-8">
+			<div class="mb-8">
+				<h1 class="text-3xl font-bold">Dashboard</h1>
+				<p class="text-muted-foreground mt-2">
+					Welcome to your dashboard
+				</p>
+			</div>
+		</div>
+	}
+}