fix: prevent delayed accessibility events from overwriting foreground cache

[DeanTMaxim]

Summary / 变更概述

Prevent delayed accessibility window-state events from overwriting the cached foreground package/activity when their original window no longer exists.

避免原窗口已经消失的延迟无障碍窗口状态事件覆盖当前前台包名/Activity 缓存。

Closes #570. Related symptom report: #529.

Root cause / 根因

Both ActivityInfoProvider implementations used:

if (window?.isFocused != false)

If getWindow(event.windowId) returns null, Kotlin evaluates null != false as true. A delayed event from a disappeared SystemUI/launcher/app window could therefore be accepted as if it were focused and replace mLatestPackage/mLatestActivity.

两个 ActivityInfoProvider 实现都使用了上述判断。当 getWindow(event.windowId) 返回 null 时，Kotlin 中 null != false 的结果为 true，所以来自已消失窗口的延迟事件可能被当作聚焦事件接纳，并覆盖 mLatestPackage/mLatestActivity。

Fix / 修复方式

Apply the following policy consistently to both maintained namespaces:

• Existing focused event window: accept.
• Existing unfocused event window: reject.
• Missing event window: accept only if both the event window ID and package match rootInActiveWindow.
• Otherwise, preserve the previous cache.

在两个维护中的命名空间内统一应用以下策略：

• 事件窗口存在且聚焦：接纳。
• 事件窗口存在但未聚焦：拒绝。
• 事件窗口不存在：仅当事件窗口 ID 和包名都与 rootInActiveWindow 一致时接纳。
• 其他情况保留原缓存。

Changed namespaces / 修改的命名空间：

• org.autojs.autojs.core.activity
• com.stardust.autojs.core.activity

Tests / 测试

Added six policy cases for each namespace (12 tests total):

• focused event window;
• unfocused event window;
• missing window with mismatched active-root window ID;
• missing window with mismatched active-root package;
• missing window confirmed by the active root;
• missing package evidence.

两个命名空间各增加 6 个策略用例，共 12 个测试，覆盖聚焦、未聚焦、活动根窗口 ID 不匹配、活动根包名不匹配、活动根确认以及缺少包名证据。

TDD evidence / TDD 证据：

• With the old eventWindowFocused != false policy, all six missing-window regression cases failed across the two namespaces.
• With this fix, both test classes report tests="6", failures="0", errors="0" (12/12 passed).

Full verification command / 完整验证命令：

gradle :app:testAppDebugUnitTest --rerun-tasks --no-daemon --stacktrace

Result / 结果：

BUILD SUCCESSFUL in 1m 24s
217 actionable tasks: 217 executed

Verification note / 验证说明

Current master has unrelated compilation errors introduced with the bottom log sheet (console_debug/console_verbose resource references and obsolete AutoJs.getInstance() calls). They are already covered by #556. To run the full unit-test task, equivalent corrections were applied locally only, the full task was rerun, and those corrections were then reverted. This PR does not contain the unrelated bottom-sheet changes.

当前 master 的底部日志面板存在与本修复无关的编译错误（console_debug/console_verbose 资源引用以及过时的 AutoJs.getInstance() 调用），#556 已处理这些问题。为执行完整单元测试，本地仅临时应用了等效修正；测试完成后已恢复。本 PR 不包含这些无关的底部日志面板改动。

The original symptom and event/window mismatch were also reproduced on an OPPO Android test device using ADB and accessibility-window inspection. Device identifiers, accounts, and application data are omitted.

原始现象及事件/窗口不匹配也已在一台 OPPO Android 测试机上通过 ADB 和无障碍窗口检查复现；设备标识、账号和应用数据均已省略。