fix(vcen-edit): corrige estilo del campo clave en MetaFieldEditor

Usa field-input y ve-label consistentemente con el resto del editor.

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

src/vcen-edit/comps/metas/MetaFieldEditor.svelte

@@ -58,7 +58,7 @@
 
     <!-- ── Field key ──────────────────────────────────────────────── -->
     <div class="flex flex-col gap-1 w-full">
-        <label class="text-xs font-medium text-gray-500">
+        <label class="ve-label">
             {glob.t('vcen.editor.mtas.editor.keyLabel')}
         </label>
         <input
@@ -66,7 +66,7 @@
             oninput={handleKeyInput}
             onblur={handleKeyCommit}
             onkeydown={handleKeydown}
-            class={['rounded border bg-gray-800 px-2 py-1.5 text-sm text-gray-200 focus:outline-none focus:ring-2 w-full font-mono', keyError ? 'border-red-600 focus:ring-red-500' : 'border-gray-700 focus:ring-blue-500'].join(' ')}
+            class={['field-input font-mono', keyError ? 'invalid' : ''].join(' ')}
             placeholder={glob.t('vcen.editor.mtas.editor.keyPlaceholder')}
         />
         {#if keyError}