refactor: externalize AppPage component and streamline all tool pages

app/(app)/figlet/page.tsx

@@ -1,17 +1,13 @@
 import { FigletConverter } from '@/components/figlet/FigletConverter';
+import { AppPage } from '@/components/layout/AppPage';
 
 export default function FigletPage() {
   return (
-    <div className="min-h-screen py-12">
-      <div className="max-w-7xl mx-auto px-8 space-y-8">
-        <div>
-          <h1 className="text-4xl font-bold mb-2">Figlet ASCII</h1>
-          <p className="text-muted-foreground">
-            ASCII Art Text Generator with 373 Fonts
-          </p>
-        </div>
-        <FigletConverter />
-      </div>
-    </div>
+    <AppPage
+      title="Figlet ASCII"
+      description="ASCII Art Text Generator with 373 Fonts"
+    >
+      <FigletConverter />
+    </AppPage>
   );
 }