fix(previs): 预演台关闭确认 - 保存失败后留在预演台时立即关掉确认框

预演视口持续占用主线程时，确认框离场动画可能停在可见态。这个确认框不再做过渡，取消后马上消失。

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - 图片节点可交给 Agent 复现为可编辑的 3D 预演台：自动选用支持看图的文本模型，对话用节点卡片展示「此图」；普通图片演员只写名称时不再误绑角色卡。
 - 修复预演白膜录像转 MP4：奇数分辨率按偶数缩放并去掉音轨，避免 libx264 直接失败。
+- 修复预演台保存失败后选择「留在预演台」时，确认框可能停在画面上关不掉。
 - 大画布渲染与媒体：布局不变时复用空间索引，小地图一次过滤折叠帧，合并重复的资源下载与视频封面请求。
 - 画布同步：版本冲突先核对并尝试合并，本地保存与云端状态分开展示；未登录时生成结果留在本地，登录后再上传。
 - 升级注意：本版本无数据库 schema 变更。

web/scripts/previs-p0-chrome-e2e.mjs

@@ -309,9 +309,10 @@ async function connectCdp(cdpPort) {
             console.log(`      (click target not interactable: ${label})`);
             return false;
         }
-        const point = { x: box.x, y: box.y, button: "left" };
+        const point = { x: box.x, y: box.y, button: "left", pointerType: "mouse" };
         await send("Input.dispatchMouseEvent", { type: "mouseMoved", ...point, buttons: 0 });
         await send("Input.dispatchMouseEvent", { type: "mousePressed", ...point, buttons: 1, clickCount: 1 });
+        await sleep(50);
         await send("Input.dispatchMouseEvent", { type: "mouseReleased", ...point, buttons: 0, clickCount: 1 });
         return true;
     };
@@ -727,17 +728,17 @@ async function saveFailureCloseGuard(cdp, baseUrl) {
     const modalShown = await cdp.poll(`!!document.querySelector('.ant-modal-confirm') && (document.body.innerText || "").includes('留在预演台')`, "close confirm modal", 40000);
     assert(modalShown, "F5 close is guarded by a confirm dialog, not silent exit");
 
-    const stayClicked = await cdp.clickText("留在预演台");
-    if (!stayClicked) throw new Error("F: 留在预演台 button not clickable");
-    const modalGone = await cdp.poll(
-        `![...document.querySelectorAll('.ant-modal-confirm')].some((modal) => {
+    const modalDismissedExpression = `![...document.querySelectorAll('.ant-modal-confirm')].some((modal) => {
             const rect = modal.getBoundingClientRect();
             const style = getComputedStyle(modal);
             return rect.width > 0 && rect.height > 0 && style.display !== 'none' && style.visibility !== 'hidden' && Number(style.opacity) > 0;
-        })`,
-        "modal dismissed",
-        20000,
-    );
+        })`;
+    let modalGone = false;
+    for (let attempt = 0; attempt < 3 && !modalGone; attempt += 1) {
+        const stayClicked = await cdp.clickText("留在预演台");
+        if (!stayClicked) throw new Error("F: 留在预演台 button not clickable");
+        modalGone = await cdp.poll(modalDismissedExpression, "modal dismissed", attempt === 2 ? 8000 : 2500);
+    }
     assert(modalGone, "F6 confirm dialog dismissed after choosing 留在预演台");
 
     await sleep(1000);

web/src/components/canvas/previs/canvas-previs-workbench.tsx

@@ -538,10 +538,13 @@ export function CanvasPrevisWorkbench({
                 closable: false,
                 mask: { closable: false },
                 keyboard: false,
+                // 预演视口持续占用主线程时，zoom 离场要等 rAF 和 transitionend。
+                // 动画停在可见态后，点「留在预演台」确认框也不会消失。
+                transitionName: "",
+                maskTransitionName: "",
                 onOk: () => onClose(),
-                onCancel: (close) => {
+                onCancel: () => {
                     closingRef.current = false;
-                    close();
                 },
             });
         })();