refactor: rename figlet app to ascii and update all references

components/layout/AppSidebar.tsx

@@ -17,7 +17,7 @@ import { cn } from '@/lib/utils/cn';
 import Logo from '@/components/Logo';
 import { useSidebar } from './SidebarProvider';
 import { Button } from '@/components/ui/button';
-import { ColorIcon, UnitsIcon, FigletIcon, MediaIcon } from '@/components/AppIcons';
+import { ColorIcon, UnitsIcon, ASCIIIcon, MediaIcon } from '@/components/AppIcons';
 
 interface NavItem {
   title: string;
@@ -41,9 +41,9 @@ const navigation: NavGroup[] = [
         icon: <UnitsIcon className="h-4 w-4" /> 
       },
       { 
-        title: 'Figlet ASCII', 
-        href: '/figlet', 
-        icon: <FigletIcon className="h-4 w-4" /> 
+        title: 'ASCII Art', 
+        href: '/ascii', 
+        icon: <ASCIIIcon className="h-4 w-4" /> 
       },
       { 
         title: 'Color Manipulation',