fix: guard AI probe worker at shutdown, keep message teardown order

[pengfeixx]

fix: guard AI probe worker at shutdown, keep message teardown order

Crash evidence (cores PID 12947 / 65684 / 334006 on V25 aarch64):
SIGSEGV inside Dtk::Core::Logger::write on a QtConcurrent worker
spawned by IflytekAiAssistant::checkAiExists(), while the main thread
is blocked in QCoreApplication::~QCoreApplication ->
QThreadPool::waitForDone waiting for that very worker. The worker's
blocking D-Bus probe (default timeout 25s) straddles app teardown;
its logging / queued callback then hits the half-torn-down log
pipeline and crashes.

1. checkAiExists() worker guard (new): bail out when
   QCoreApplication::instance() is null or closingDown() -- at task
   entry, after each blocking D-Bus call, and before logging /
   queued invoke. copilotInstalled() / isCopilotEnabled() also skip
   their logging once shutting down.
2. EditWrapper teardown ordering (kept from closed PR fix: fix crash on close after editing text in zip archive #640): delete
   m_pWaringNotices before m_pTextEdit so the DMessageManager content
   widget is cleaned up while its parent is still alive.

Log: Fixed crash log generated when closing a text document opened from a zip archive, and the same-signature exit crash

Influence:

1. Test opening a text document from a zip archive, edit, save, close
2. Test double-clicking a desktop text document with editor running
3. Test quick close of the editor right after startup
4. Run common2 / editwrapper / startmanager unit test suites

fix: 退出期 AI 探测线程防护,并保留消息浮层析构顺序修复

崩溃证据（V25 aarch64 上 PID 12947 / 65684 / 334006 三个 core）：
SIGSEGV 发生在 Dtk::Core::Logger::write，崩溃线程是
IflytekAiAssistant::checkAiExists() 派生的 QtConcurrent 工作线程；
此时主线程正阻塞在 QCoreApplication::~QCoreApplication ->
QThreadPool::waitForDone 等待该工作线程收尾。工作线程的阻塞式
D-Bus 探测（默认超时 25 秒）跨越了应用退出过程，随后的日志/
排队回调命中已半拆除的日志管线导致崩溃。

1. checkAiExists() 工作线程防护（新增）：当
   QCoreApplication::instance() 为空或 closingDown() 时直接退出——
   覆盖任务入口、每次阻塞 D-Bus 调用返回后、打日志/排队回调前；
   copilotInstalled() / isCopilotEnabled() 在退出期同样跳过日志。
2. EditWrapper 析构顺序（保留自已关闭的 PR fix: fix crash on close after editing text in zip archive #640）：将
   m_pWaringNotices 的删除提前到 m_pTextEdit 之前，使
   DMessageManager 的 content 控件在父控件存活期间完成清理。

Log: 修复压缩包打开文本文档关闭后产生崩溃日志的问题，及同签名的退出崩溃

Influence:

1. 测试压缩包中打开文本文档、修改保存后关闭
2. 测试编辑器已打开时双击桌面文本文档
3. 测试编辑器启动后立即关闭
4. 运行 common2 / editwrapper / startmanager 单元测试

PMS: BUG-378881

(cherry-pick of #646 onto release/snipe)

Summary by Sourcery

Prevent shutdown-time crashes in AI probing and editor teardown.

Bug Fixes:

• Prevent crashes during application shutdown by stopping AI probe workers from logging or dispatching callbacks once teardown begins.
• Fix editor shutdown crashes by destroying warning notifications before the text editor they reference.

[sourcery-ai]

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: pengfeixx

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[sourcery-ai]

Reviewer's Guide

Prevents exit-time crashes from QtConcurrent AI probes by stopping teardown-time logging and callbacks around blocking D-Bus calls, while preserving the message-overlay destruction order needed to avoid dangling text-editor references.

Sequence diagram for shutdown-safe AI probe worker

sequenceDiagram
    participant App as QCoreApplication
    participant Worker as QtConcurrent worker
    participant AI as IflytekAiAssistant
    participant DBus as D-Bus backend
    participant Logger as Logging and event pipeline

    Worker->>AI: checkAiExists()
    alt appShuttingDown() at task entry
        AI-->>Worker: return
    else application running
        Worker->>AI: copilotInstalled()
        AI->>DBus: call(version)
        DBus-->>AI: QDBusReply
        AI->>AI: appShuttingDown()
        Worker->>AI: isCopilotEnabled()
        AI->>DBus: call(isCopilotEnabled)
        DBus-->>AI: QDBusReply
        AI->>AI: appShuttingDown()
        alt shutdown detected after D-Bus calls
            AI-->>Worker: return before logging or callback
        else application still running
            Worker->>Logger: qInfo()
            Worker-->>App: queued callback
        end
    end
    App->>App: closingDown()
    App->>Worker: QThreadPool::waitForDone()

Loading

File-Level Changes

Change	Details	Files
Guard asynchronous AI capability probing against application teardown before and after blocking work, and suppress shutdown-time logging.	Added a centralized shutdown-state check using QCoreApplication::instance() and closingDown(). Checked shutdown state at worker entry and after D-Bus probes before logging or queued callbacks. Applied shutdown-aware logging in copilot installation and enablement checks.	src/common/iflytek_ai_assistant.cpp src/common/iflytek_ai_assistant.h
Restore safe widget destruction ordering during editor teardown.	Destroy warning notices and disconnect them before deleting the text editor. Clear the warning-notice pointer and remove the former later destruction block.	src/editor/editwrapper.cpp

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