fix: eliminate loading screen flash after prestige (#163)

Add reloadSilent which rehydrates state without toggling isLoading,
preventing the game from unmounting and showing the loading screen
after auto- or manual prestige.

apps/web/src/components/game/prestigePanel.tsx

@@ -84,7 +84,7 @@ const categoryOrder: Array<PrestigeUpgradeCategory> = [
 const PrestigePanel = (): JSX.Element => {
   const {
     state,
-    reload,
+    reloadSilent,
     formatNumber,
     buyPrestigeUpgrade,
     enableNotifications,
@@ -141,7 +141,7 @@ const PrestigePanel = (): JSX.Element => {
           `You've reached prestige level ${data.newPrestigeCount.toString()}!`,
         );
       }
-      await reload();
+      await reloadSilent();
     } catch (error_: unknown) {
       setPrestigeError(
         error_ instanceof Error

apps/web/src/context/gameContext.tsx

@@ -310,6 +310,12 @@ interface GameContextValue {
    */
   reload: ()=> Promise<void>;
 
+  /**
+   * Reload state from the server without showing the loading screen (used
+   * after prestige to avoid the visible flash/hang).
+   */
+  reloadSilent: ()=> Promise<void>;
+
   /**
    * Unix timestamp of the last successful cloud save (null until first save response).
    */
@@ -718,6 +724,10 @@ export const GameProvider = ({
 
     /* No-op placeholder */
   });
+  const reloadSilentReference = useRef<()=> Promise<void>>(async() => {
+
+    /* No-op placeholder */
+  });
   const [ schemaOutdated, setSchemaOutdated ] = useState(false);
   const [ saveSchemaVersion, setSaveSchemaVersion ] = useState(0);
   const [ currentSchemaVersion, setCurrentSchemaVersion ] = useState(0);
@@ -805,6 +815,32 @@ export const GameProvider = ({
 
   reloadReference.current = reload;
 
+  const reloadSilent = useCallback(async() => {
+    setError(null);
+    try {
+      const data = await loadGame();
+      setState(data.state);
+      setLastSavedAt(data.state.player.lastSavedAt);
+      if (data.signature !== undefined) {
+        signatureReference.current = data.signature;
+        localStorage.setItem("elysium_save_signature", data.signature);
+      }
+      setLoginStreak(data.loginStreak);
+      setSchemaOutdated(data.schemaOutdated);
+      setSaveSchemaVersion(data.state.schemaVersion ?? 0);
+      setCurrentSchemaVersion(data.currentSchemaVersion);
+      setInGuild(data.inGuild);
+    } catch (error_: unknown) {
+      setError(
+        error_ instanceof Error
+          ? error_.message
+          : "Failed to load game",
+      );
+    }
+  }, []);
+
+  reloadSilentReference.current = reloadSilent;
+
   useEffect(() => {
     enableSoundsReference.current = enableSounds;
   }, [ enableSounds ]);
@@ -1315,7 +1351,7 @@ export const GameProvider = ({
             if (enableNotificationsReference.current) {
               sendNotification("⭐ Prestige!", "You have ascended!");
             }
-            await reloadReference.current();
+            await reloadSilentReference.current();
           }).
           catch(() => {
 
@@ -2373,6 +2409,7 @@ export const GameProvider = ({
       offlineEssence,
       offlineGold,
       reload,
+      reloadSilent,
       resetProgress,
       saveSchemaVersion,
       schemaOutdated,