feat: add QR code generator tool

Add a sixth tool with live SVG preview, customizable foreground/background
colors, error correction level, margin control, and export as PNG (256–2048px)
or SVG. URL params enable shareable state. All processing runs client-side
via the qrcode package.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/ascii/ASCIIConverter.tsx

@@ -11,7 +11,7 @@ import { addRecentFont } from '@/lib/storage/favorites';
 import { decodeFromUrl, updateUrl, getShareableUrl } from '@/lib/utils/urlSharing';
 import { toast } from 'sonner';
 import type { ASCIIFont } from '@/types/ascii';
-import { Card, CardContent } from '../ui/card';
+import { Card, CardContent, CardHeader, CardTitle } from '../ui/card';
 
 export function ASCIIConverter() {
   const [text, setText] = React.useState('ASCII');
@@ -121,7 +121,11 @@ export function ASCIIConverter() {
       {/* Left Column - Input and Preview */}
       <div className="lg:col-span-2 space-y-6 overflow-y-auto custom-scrollbar">
         <Card>
+          <CardHeader>
+            <CardTitle>Text</CardTitle>
+          </CardHeader>
           <CardContent>
+                
             <TextInput
               value={text}
               onChange={setText}