Optimize ui for intialization stage

lightrag_webui/src/App.tsx

@@ -3,12 +3,13 @@ import ThemeProvider from '@/components/ThemeProvider'
 import TabVisibilityProvider from '@/contexts/TabVisibilityProvider'
 import ApiKeyAlert from '@/components/ApiKeyAlert'
 import StatusIndicator from '@/components/status/StatusIndicator'
-import { healthCheckInterval } from '@/lib/constants'
+import { healthCheckInterval, SiteInfo, webuiPrefix } from '@/lib/constants'
 import { useBackendState, useAuthStore } from '@/stores/state'
 import { useSettingsStore } from '@/stores/settings'
 import { getAuthStatus } from '@/api/lightrag'
 import SiteHeader from '@/features/SiteHeader'
 import { InvalidApiKeyError, RequireApiKeError } from '@/api/lightrag'
+import { ZapIcon } from 'lucide-react'
 
 import GraphViewer from '@/features/GraphViewer'
 import DocumentManager from '@/features/DocumentManager'
@@ -122,11 +123,32 @@ function App() {
     <ThemeProvider>
       <TabVisibilityProvider>
         {initializing ? (
-          // Loading state while initializing
-          <div className="flex h-screen w-screen items-center justify-center">
-            <div className="text-center">
-              <div className="mb-2 h-8 w-8 animate-spin rounded-full border-4 border-primary border-t-transparent"></div>
-              <p>Initializing...</p>
+          // Loading state while initializing with simplified header
+          <div className="flex h-screen w-screen flex-col">
+            {/* Simplified header during initialization - matches SiteHeader structure */}
+            <header className="border-border/40 bg-background/95 supports-[backdrop-filter]:bg-background/60 sticky top-0 z-50 flex h-10 w-full border-b px-4 backdrop-blur">
+              <div className="min-w-[200px] w-auto flex items-center">
+                <a href={webuiPrefix} className="flex items-center gap-2">
+                  <ZapIcon className="size-4 text-emerald-400" aria-hidden="true" />
+                  <span className="font-bold md:inline-block">{SiteInfo.name}</span>
+                </a>
+              </div>
+
+              {/* Empty middle section to maintain layout */}
+              <div className="flex h-10 flex-1 items-center justify-center">
+              </div>
+
+              {/* Empty right section to maintain layout */}
+              <nav className="w-[200px] flex items-center justify-end">
+              </nav>
+            </header>
+
+            {/* Loading indicator in content area */}
+            <div className="flex flex-1 items-center justify-center">
+              <div className="text-center">
+                <div className="mb-2 h-8 w-8 animate-spin rounded-full border-4 border-primary border-t-transparent"></div>
+                <p>Initializing...</p>
+              </div>
             </div>
           </div>
         ) : (