perf: make splash non-blocking and session-aware

app/providers.tsx

@@ -5,23 +5,44 @@ import { ThemeProvider } from '@/components/ThemeToggle'
 import { ToastProvider } from '@/hooks/use-toast'
 import { SplashScreen } from '@/components/SplashScreen'
 
+const SPLASH_SESSION_KEY = 'offlineacademy:splash-seen'
+
 export function Providers({ children }: { children: React.ReactNode }) {
   const [showSplash, setShowSplash] = React.useState(true)
 
-  // Safety fallback: force hide after 5 seconds max
+  React.useLayoutEffect(() => {
+    try {
+      if (sessionStorage.getItem(SPLASH_SESSION_KEY) === 'true') {
+        setShowSplash(false)
+      }
+    } catch {
+      setShowSplash(false)
+    }
+  }, [])
+
   React.useEffect(() => {
-    const timer = setTimeout(() => setShowSplash(false), 5000)
+    if (!showSplash) return
-    return () => clearTimeout(timer)
+    const timer = window.setTimeout(() => setShowSplash(false), 2500)
+    return () => window.clearTimeout(timer)
+  }, [showSplash])
+
+  const completeSplash = React.useCallback(() => {
+    try {
+      sessionStorage.setItem(SPLASH_SESSION_KEY, 'true')
+    } catch {
+      // Storage can be unavailable in hardened/private browser modes.
+    }
+    setShowSplash(false)
   }, [])
 
   return (
     <ThemeProvider>
       <ToastProvider>
+        {children}
         {showSplash && (
-          <SplashScreen onComplete={() => setShowSplash(false)} minDuration={1500} />
+          <SplashScreen onComplete={completeSplash} minDuration={550} />
         )}
-        {!showSplash && children}
       </ToastProvider>
     </ThemeProvider>
   )
-}
+}