refactor: restructure navigation and module layout

Reorganize navigation and module structure based on new requirements.

Co-authored-by: null <4804959+fnvtk@users.noreply.github.com>

app/ai-insight/loading.tsx

@@ -0,0 +1,21 @@
+import { Skeleton } from "@/components/ui/skeleton"
+
+export default function Loading() {
+  return (
+    <div className="min-h-screen bg-gradient-to-br from-slate-50 via-white to-blue-50/30 p-6">
+      <div className="max-w-7xl mx-auto space-y-6">
+        <Skeleton className="h-10 w-64" />
+        <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
+          {[...Array(4)].map((_, i) => (
+            <Skeleton key={i} className="h-28 rounded-xl" />
+          ))}
+        </div>
+        <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
+          {[...Array(4)].map((_, i) => (
+            <Skeleton key={i} className="h-40 rounded-xl" />
+          ))}
+        </div>
+      </div>
+    </div>
+  )
+}