feat: 优化编辑器 UI 和文件名显示，支持全屏编辑模式

frontend/portal/src/layout/LayoutCreator.vue

@@ -1,8 +1,8 @@
 <template>
-   <div class="min-h-screen flex flex-col bg-slate-50">
-      <TopNavbar />
-      <main class="flex-grow pt-16">
-         <div class="mx-auto flex gap-8 h-full" :class="isFullWidth ? 'max-w-none px-0' : 'max-w-screen-xl py-8'">
+   <div class="flex flex-col bg-slate-50" :class="isFullWidth ? 'h-screen overflow-hidden' : 'min-h-screen'">
+      <TopNavbar v-if="!isFullWidth" />
+      <main class="flex-grow flex flex-col min-h-0" :class="!isFullWidth ? 'pt-16' : ''">
+         <div class="mx-auto flex gap-8 w-full min-h-0 flex-grow" :class="isFullWidth ? 'max-w-none px-0' : 'max-w-screen-xl py-8'">
             <!-- Creator Sidebar (Dark Theme) -->
             <aside class="w-[280px] flex-shrink-0 hidden lg:block" v-if="!isFullWidth">
                <div
@@ -66,12 +66,12 @@
             </aside>
 
             <!-- Main Content -->
-            <div class="flex-grow min-w-0">
+            <div class="flex-grow min-w-0 h-full">
                <router-view />
             </div>
          </div>
       </main>
-      <AppFooter />
+      <AppFooter v-if="!isFullWidth" />
    </div>
 </template>