moved 分支拖拽取消时也传播 dragCancelled

cancelActiveDrag 不检查 hasMoved，已移动过的返回球被截图/blur/12s 超时中断时会走
finishDrag 的 moved 分支，而该分支原本只发普通 return-ball-drag-end、不带 dragCancelled，
导致 app-auto-goodbye.js 把这次「丢失释放」当真实拖拽结束、照常降级猫档/回猫，架空了
no-move 分支已加的取消处理。moved 分支两处 dispatch 补上 dragCancelled: suppressClick，
与 no-move 分支对偶。补一条静态断言守回归。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: Hongzhi Wen

static/app-ui.js

@@ -2887,7 +2887,8 @@
                         detail: {
                             reason: 'return-ball-drag-end',
                             container: container,
-                            movedDistancePx: movedDistancePx
+                            movedDistancePx: movedDistancePx,
+                            dragCancelled: suppressClick
                         }
                     }));
                     revealReturnBallDragWindow();
@@ -2905,7 +2906,8 @@
                     detail: {
                         reason: 'return-ball-drag-end',
                         container: container,
-                        movedDistancePx: movedDistancePx
+                        movedDistancePx: movedDistancePx,
+                        dragCancelled: suppressClick
                     }
                 }));
                 revealReturnBallDragWindow();

tests/unit/test_avatar_return_button_idle_tiers_static.py

@@ -318,6 +318,9 @@ def test_desktop_return_ball_drag_recovers_when_mouse_release_is_lost():
     assert "movedDistancePx: 0" in source
     assert "dispatchReturnBallClick();" in source
     assert "window.nekoPetDrag.stop(stopScreenX, stopScreenY)" in source
+    # 已经移动过的拖拽被中断（截图/blur/超时）时也要传播取消标记，
+    # 否则 moved 分支照常派发 drag-end，app-auto-goodbye 会当成真实释放降级猫档
+    assert "dragCancelled: suppressClick" in source
 
 
 def test_return_button_drag_has_single_owner_per_runtime_path():