refactor: extract MobileTabs shared component, replace in all 8 tools

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

components/qrcode/QRCodeGenerator.tsx

@@ -10,6 +10,7 @@ import { downloadBlob } from '@/lib/media/utils/fileUtils';
 import { debounce } from '@/lib/utils/debounce';
 import { toast } from 'sonner';
 import { cn } from '@/lib/utils/cn';
+import { MobileTabs } from '@/components/ui/mobile-tabs';
 import type { ErrorCorrectionLevel, ExportSize } from '@/types/qrcode';
 
 type MobileTab = 'configure' | 'preview';
@@ -100,23 +101,11 @@ export function QRCodeGenerator() {
   return (
     <div className="flex flex-col gap-4">
 
-      {/* ── Mobile tab switcher ─────────────────────────────── */}
-      <div className="flex lg:hidden glass rounded-xl p-1 gap-1">
-        {(['configure', 'preview'] as MobileTab[]).map((t) => (
-          <button
-            key={t}
-            onClick={() => setMobileTab(t)}
-            className={cn(
-              'flex-1 py-2.5 rounded-lg text-sm font-medium capitalize transition-all',
-              mobileTab === t
-                ? 'bg-primary text-primary-foreground shadow-sm'
-                : 'text-muted-foreground hover:text-foreground'
-            )}
-          >
-            {t === 'configure' ? 'Configure' : 'Preview'}
-          </button>
-        ))}
-      </div>
+      <MobileTabs
+        tabs={[{ value: 'configure', label: 'Configure' }, { value: 'preview', label: 'Preview' }]}
+        active={mobileTab}
+        onChange={(v) => setMobileTab(v as MobileTab)}
+      />
 
       {/* ── Main layout ─────────────────────────────────────── */}
       <div