feat: add reports section to admin dashboard

- Introduced a new "Signalements" card with navigation to `/admin/reports`.
- Added `Flag` icon for the reports section.

frontend/src/app/(dashboard)/admin/page.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { AlertCircle, FileText, LayoutGrid, Users } from "lucide-react";
+import { AlertCircle, FileText, Flag, LayoutGrid, Users } from "lucide-react";
 import Link from "next/link";
 import { useEffect, useState } from "react";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
@@ -54,6 +54,13 @@ export default function AdminDashboardPage() {
 			href: "/admin/categories",
 			color: "text-purple-500",
 		},
+		{
+			title: "Signalements",
+			value: "Voir",
+			icon: Flag,
+			href: "/admin/reports",
+			color: "text-red-500",
+		},
 	];
 
 	return (