fix(desktop): 指针移出模型列表时收起打开的行

.scratch/model-selector/PRD.md

@@ -22,7 +22,8 @@ Issue: [#99](https://github.com/BubblePtr/PiGUI/issues/99) · 前身规格见 `.
 - 顶点 = 指针 ~200ms 前的轨迹点(`POINTER_TRAIL_MS`),底边 = 飞出层实时 `getBoundingClientRect()` 左边缘 ± 8px(`TRIANGLE_PAD_PX`)。
 - 指针在三角形内 → 判定"正在赶往飞出层",每 100ms 重估;**离开三角形或原地停下(200ms 内位移 < 3px)→ 立即切换**,无固定延迟。
 - 指针已达飞出层 → 放弃待定切换;点击行 → 绕过三角形立即提交。
-- 离开整个面板保留 300ms 关闭宽限期兜底(Radix/Floating UI 同款混合策略)。
+- **高亮与飞出层只属于指针所在之处**:指针在面板内移到列表/飞出层集群之外(搜索框、`Add Models` 行、面板内边距)→ 立即收起(2026-10-07 修正;此前 `Add Models` 悬停时上一行仍保持高亮与飞出层)。
+- 离开整个面板保留 300ms 关闭宽限期兜底(Radix/Floating UI 同款混合策略),该宽限期仍服务于"行 → 飞出层"的 28px 缝隙跨越。
 - 曾用时间法(120ms 停留阈值)过渡,因主动换行有钝感被几何法替换。
 
 ### 事实依据(调研结论,勿再翻案)

apps/desktop/src/entities/model/model-selector/model-selector-control.test.tsx

@@ -1,4 +1,4 @@
-import { render, screen, within } from "@testing-library/react";
+import { render, screen, waitFor, within } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
 import { describe, expect, it, vi } from "vitest";
 import type { RuntimeModelControls } from "@pace/core";
@@ -131,6 +131,41 @@ describe("ModelSelectorControl visibility", () => {
   });
 });
 
+describe("ModelSelectorControl hover intent", () => {
+  it("drops the active row when the pointer leaves the list for Add Models", async () => {
+    render(
+      <ModelSelectorControl
+        controls={controls}
+        isDisabled={false}
+        onChange={() => {}}
+        onManageModels={() => {}}
+      />,
+    );
+
+    const { user, list } = await openSelector();
+    const rows = within(list).getAllByRole("listitem");
+    const lastRow = rows[rows.length - 1] as HTMLElement;
+
+    await user.hover(lastRow);
+
+    expect(
+      screen.getByRole("group", { name: "Kimi K3 options" }),
+    ).toBeInTheDocument();
+    expect(lastRow).toHaveAttribute("aria-current", "true");
+
+    await user.hover(screen.getByText("Add Models"));
+
+    // The row highlight and its flyout belong to the row under the pointer;
+    // the panel chrome below the list must not keep the last row lit.
+    await waitFor(() =>
+      expect(
+        screen.queryByRole("group", { name: "Kimi K3 options" }),
+      ).not.toBeInTheDocument(),
+    );
+    expect(lastRow).not.toHaveAttribute("aria-current");
+  });
+});
+
 describe("ModelSelectorControl provider mark", () => {
   it("shows the provider mark next to the model name for a known provider", () => {
     render(

apps/desktop/src/entities/model/model-selector/model-selector-control.tsx

@@ -3,8 +3,9 @@
 // (vertical Reasoning levels + Fast Mode switch). Fast siblings are separate
 // catalog entries merged into one family row here. Hover intent uses a
 // safe-triangle (menu-aim): while the pointer travels toward the open flyout
-// it is never stolen by rows on the way. Decision record:
-// .scratch/model-selector/PRD.md
+// it is never stolen by rows on the way, and the open row is dropped the
+// moment the pointer settles on the panel's chrome instead of a row.
+// Decision record: .scratch/model-selector/PRD.md
 
 import { useEffect, useRef, useState, type ComponentProps } from "react";
 import { Button } from "@astryxdesign/core/Button";
@@ -99,6 +100,21 @@ function useModelFlyout() {
     clearTimer(closeTimerRef);
   };
 
+  /** Ends the hover at once, without the panel-exit grace period. */
+  const closeFlyoutNow = () => {
+    clearTimer(closeTimerRef);
+    clearTimer(switchTimerRef);
+    activeKeyRef.current = null;
+    setActiveKey(null);
+  };
+
+  /**
+   * Every pointer move inside the panel: records the trail the safe triangle
+   * reads, and drops the open row as soon as the pointer has settled on the
+   * panel's chrome (search field, Add Models row) instead of a row. Leaving
+   * the panel keeps closeFlyout's 300ms grace instead, which a pointer
+   * crossing the gap toward the flyout depends on.
+   */
   const trackPointer = (event: React.PointerEvent) => {
     const trail = pointerTrailRef.current;
     const now = Date.now();
@@ -107,6 +123,13 @@ function useModelFlyout() {
     while (trail.length > 1 && now - (trail[0]?.time ?? now) > POINTER_TRAIL_MS) {
       trail.shift();
     }
+
+    if (
+      activeKeyRef.current !== null &&
+      !anchorRef.current?.contains(event.target as Node)
+    ) {
+      closeFlyoutNow();
+    }
   };
 
   const commitOpen = (key: string, row: HTMLElement | null) => {