Merge remote-tracking branch 'origin/master' into codex/pr57-p0-p2

# Conflicts:
#	docs/【玩法创作】平台入口与玩法链路-2026-05-15.md
#	docs/【项目基线】当前产品与工程约束-2026-05-15.md

src/components/rpg-entry/RpgEntryHomeView.tsx

@@ -38,6 +38,7 @@ import {
   type CSSProperties,
   type PointerEvent,
   type ReactNode,
+  Suspense,
   useCallback,
   useEffect,
   useMemo,
@@ -196,6 +197,7 @@ export interface RpgEntryHomeViewProps {
   recommendRuntimeContent?: ReactNode;
   activeRecommendEntryKey?: string | null;
   isStartingRecommendEntry?: boolean;
+  isRecommendRuntimeReady?: boolean;
   recommendRuntimeError?: string | null;
   onSelectNextRecommendEntry?: (activeEntryKey?: string | null) => void;
   onSelectPreviousRecommendEntry?: (activeEntryKey?: string | null) => void;
@@ -952,6 +954,115 @@ function RecommendRuntimePreviewCard({
   );
 }
 
+function RecommendRuntimeCover({
+  entry,
+  className = '',
+}: {
+  entry: PlatformPublicGalleryCard;
+  className?: string;
+}) {
+  const coverImage = resolvePlatformWorldCoverImage(entry);
+  const fallbackCoverImage = resolvePlatformWorldFallbackCoverImage(entry);
+
+  return (
+    <div
+      className={`platform-recommend-runtime-cover ${className}`}
+      aria-hidden="true"
+    >
+      {coverImage || fallbackCoverImage ? (
+        <PlatformWorkCoverArtwork
+          entry={entry}
+          imageSrc={coverImage}
+          fallbackSrc={fallbackCoverImage}
+          alt=""
+          className="absolute inset-0 h-full w-full object-cover"
+        />
+      ) : (
+        <div className="absolute inset-0 bg-[radial-gradient(circle_at_22%_18%,rgba(255,255,255,0.28),transparent_30%),linear-gradient(135deg,rgba(255,118,117,0.42),rgba(89,164,255,0.34))]" />
+      )}
+      <div className="absolute inset-0 bg-[linear-gradient(180deg,rgba(0,0,0,0.05),rgba(0,0,0,0.34))]" />
+    </div>
+  );
+}
+
+function RecommendRuntimeMountedProbe({
+  onMounted,
+}: {
+  onMounted: () => void;
+}) {
+  useEffect(() => {
+    const animationFrameId = window.requestAnimationFrame(onMounted);
+    return () => window.cancelAnimationFrame(animationFrameId);
+  }, [onMounted]);
+
+  return null;
+}
+
+function RecommendRuntimeVisual({
+  entry,
+  runtimeContent,
+  isStarting,
+  isRuntimeReady,
+}: {
+  entry: PlatformPublicGalleryCard;
+  runtimeContent?: ReactNode;
+  isStarting: boolean;
+  isRuntimeReady: boolean;
+}) {
+  const [isRuntimeMounted, setIsRuntimeMounted] = useState(false);
+  const activeEntryKey = buildPublicGalleryCardKey(entry);
+  const previousEntryKeyRef = useRef(activeEntryKey);
+
+  useEffect(() => {
+    if (previousEntryKeyRef.current === activeEntryKey) {
+      return;
+    }
+    previousEntryKeyRef.current = activeEntryKey;
+    setIsRuntimeMounted((currentValue) => {
+      // 中文注释：拼图推荐流“下一关”会在同一个 run 内切到相似作品；
+      // 此时只更新作品信息和分享基准，不应重显封面造成运行态闪跳。
+      if (currentValue && !isStarting && isRuntimeReady) {
+        return currentValue;
+      }
+      return false;
+    });
+  }, [activeEntryKey, isRuntimeReady, isStarting]);
+
+  const handleRuntimeMounted = useCallback(() => {
+    if (!isStarting && isRuntimeReady) {
+      setIsRuntimeMounted(true);
+    }
+  }, [isRuntimeReady, isStarting]);
+
+  const shouldShowCover =
+    !runtimeContent || isStarting || !isRuntimeReady || !isRuntimeMounted;
+
+  return (
+    <div className="platform-recommend-runtime-visual">
+      {runtimeContent ? (
+        <Suspense fallback={null}>
+          <div
+            className="platform-recommend-runtime-viewport"
+            aria-hidden={shouldShowCover}
+          >
+            {runtimeContent}
+          </div>
+          <RecommendRuntimeMountedProbe
+            key={activeEntryKey}
+            onMounted={handleRuntimeMounted}
+          />
+        </Suspense>
+      ) : null}
+      <RecommendRuntimeCover
+        entry={entry}
+        className={
+          shouldShowCover ? '' : 'platform-recommend-runtime-cover--hidden'
+        }
+      />
+    </div>
+  );
+}
+
 function RecommendSwipeCard({
   entry,
   authorAvatarUrl,
@@ -4014,6 +4125,7 @@ export function RpgEntryHomeView({
   recommendRuntimeContent,
   activeRecommendEntryKey = null,
   isStartingRecommendEntry = false,
+  isRecommendRuntimeReady = false,
   recommendRuntimeError = null,
   onSelectNextRecommendEntry,
   onSelectPreviousRecommendEntry,
@@ -5712,10 +5824,6 @@ export function RpgEntryHomeView({
             {recommendRuntimeError}
           </button>
         </section>
-      ) : isStartingRecommendEntry ? (
-        <section className="platform-recommend-runtime-panel">
-          <div className="platform-recommend-runtime-state">加载中...</div>
-        </section>
       ) : activeRecommendEntry ? (
         <div
           ref={recommendCardStageRef}
@@ -5757,9 +5865,12 @@ export function RpgEntryHomeView({
                 )}
                 isActive
                 visual={
-                  <div className="platform-recommend-runtime-viewport">
-                    {recommendRuntimeContent}
-                  </div>
+                  <RecommendRuntimeVisual
+                    entry={activeRecommendEntry}
+                    runtimeContent={recommendRuntimeContent}
+                    isStarting={isStartingRecommendEntry}
+                    isRuntimeReady={isRecommendRuntimeReady}
+                  />
                 }
                 onDragPointerDown={beginRecommendDrag}
                 onDragPointerMove={moveRecommendDrag}