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

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

components/media/FileConverter.tsx

@@ -2,6 +2,7 @@
 
 import * as React from 'react';
 import { SliderRow } from '@/components/ui/slider-row';
+import { MobileTabs } from '@/components/ui/mobile-tabs';
 import { FileUpload } from './FileUpload';
 import { ConversionPreview } from './ConversionPreview';
 import { toast } from 'sonner';
@@ -182,23 +183,11 @@ export function FileConverter() {
   return (
     <div className="flex flex-col gap-4">
 
-      {/* ── Mobile tab switcher ─────────────────────────────── */}
-      <div className="flex lg:hidden glass rounded-xl p-1 gap-1">
-        {(['upload', 'convert'] 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 === 'upload' ? 'Upload' : 'Convert'}
-          </button>
-        ))}
-      </div>
+      <MobileTabs
+        tabs={[{ value: 'upload', label: 'Upload' }, { value: 'convert', label: 'Convert' }]}
+        active={mobileTab}
+        onChange={(v) => setMobileTab(v as MobileTab)}
+      />
 
       {/* ── Main layout ─────────────────────────────────────── */}
       <div