调整创作主页顶部与左侧栏

更新 /creation 顶部栏和左侧功能栏的参考图规格

接入创作主页 image2 陶土风背景、图标和按钮素材

保留创作主页现有文案、搜索、登录、钱包、导航与项目创建逻辑

补充创作主页改版文档和移动端直达验证

src/components/platform-entry/PlatformEntryFlowShellImpl.tsx

@@ -15268,6 +15268,7 @@ export function PlatformEntryFlowShellImpl({
           ? 'create'
           : platformBootstrap.platformTab
       }
+      allowHiddenActiveTab={selectionStage === 'creation-home'}
       onTabChange={handlePlatformHomeTabChange}
       hasSavedGame={hasSavedGame}
       savedSnapshot={savedSnapshot}
@@ -15428,7 +15429,7 @@ export function PlatformEntryFlowShellImpl({
             initial={{ opacity: 0, y: 12 }}
             animate={{ opacity: 1, y: 0 }}
             exit={{ opacity: 0, y: -12 }}
-            className="flex h-full min-h-0 min-w-0 flex-col overflow-hidden"
+            className="creation-home-stage flex h-full min-h-0 min-w-0 flex-col overflow-hidden"
           >
             {platformHomeView}
           </motion.div>