fix(reader): save reading progress with 0.5s debounce on page change

[add-uos]

Page changes only updated m_operation.currentPage in memory; progress was persisted only on bookmark/annotation ops, every 30s auto-save or clean close, so killall lost the last page position while bookmarks survived. Start a single-shot debounce timer (500ms, restarted on each page change so bursts coalesce) that calls saveProgressToDb(); the database runs in WAL with synchronous=FULL, so the save survives abnormal termination.

页面切换仅在内存更新当前页，阅读进度此前只在书签/注释操作、30秒自动
保存、正常关闭时落盘，killall 杀进程会丢失最新进度而书签已保存。
新增 0.5 秒防抖定时器（每次页面切换重启计时，连续变化自动合并），
超时后经 saveProgressToDb() 落盘；数据库为 WAL+synchronous=FULL， 异常退出后进度不丢。

Log: 页面切换后防抖保存阅读进度，异常退出进度不丢
PMS: BUG-375997
Influence: 翻页后 0.5 秒自动落盘阅读进度，killall 等异常退出进度可恢复；正常关闭流程行为不变。

Summary by Sourcery

Persist reading progress after page changes to prevent the latest position from being lost on abnormal exit.

Bug Fixes:

• Persist reading progress shortly after page changes so the latest position survives abnormal process termination.

Enhancements:

• Coalesce rapid page changes with a single-shot debounce while preserving immediate saves during normal shutdown.

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[sourcery-ai]

Reviewer's Guide

Reading progress is now persisted 500 ms after the latest page change via a single-shot debounce timer, reducing the window in which abnormal termination can lose the current page while preserving existing auto-save and clean-close behavior.

Sequence diagram for debounced reading progress persistence

sequenceDiagram
    participant Reader as Reader UI
    participant DocSheet
    participant Timer as m_progressSaveTimer
    participant DB as Progress database

    Reader->>DocSheet: onBrowserPageChanged(page)
    DocSheet->>DocSheet: update m_operation.currentPage
    DocSheet->>Timer: start()
    Note over Timer: Single-shot 500 ms timer
    opt another page change before timeout
        Reader->>DocSheet: onBrowserPageChanged(page)
        DocSheet->>Timer: start()
    end
    Timer->>DocSheet: saveProgressToDb()
    DocSheet->>DB: persist current reading progress

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File-Level Changes

Change	Details	Files
Add a single-shot, restartable debounce timer to persist the current reading page after navigation changes.	Create a 500 ms parented QTimer connected to saveProgressToDb(). Restart the timer whenever the browser page changes, coalescing rapid navigation events. Stop the debounce timer during shutdown after the existing immediate save path runs. Document the timer and debounce interval alongside the progress persistence API and state.	reader/uiframe/DocSheet.cpp reader/uiframe/DocSheet.h

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[add-uos]

/merge