fix: 修复联想YOGA pro14（Ultra7）使用电源键无法关闭显示器的问题

[applyforprof]

BUG: 349047
Influence: Power

Summary by Sourcery

Bug Fixes:

• Fix power key behavior on certain devices by enabling the screen saver and briefly delaying before forcing the display power state off on X11.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR adjusts the X11 code path for turning off the screen so that it first enables the X screen saver and waits briefly before forcing DPMS off, improving compatibility on Lenovo YOGA Pro 14 (Ultra7) when using the power button to turn off the display.

Sequence diagram for updated X11 screen power-off behavior

sequenceDiagram
    actor User
    participant PowerButton
    participant Manager
    participant XServer
    participant xset
    participant dpms

    User ->> PowerButton: Press power button
    PowerButton ->> Manager: systemTurnOffScreen()

    alt Wayland_session
        Manager ->> XServer: dde_wldpms -s Off
        XServer -->> Manager: Screen off (Wayland)
    else X11_session
        Manager ->> xset: xset s on
        xset -->> Manager: Result or error
        Manager ->> Manager: Sleep 100ms
        Manager ->> dpms: ForceLevelChecked(DPMSModeOff)
        dpms -->> Manager: Screen off (DPMS)
    end

    Manager -->> PowerButton: Return
    PowerButton -->> User: Display turned off

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File-Level Changes

Change	Details	Files
Improve X11-based screen-off sequence by enabling screen saver and adding a short delay before forcing DPMS off to increase reliability.	Before invoking DPMSModeOff, run xset s on to ensure the X screen saver is enabled. Log a warning instead of failing hard if enabling the screen saver via xset returns an error. Insert a 100ms sleep between the xset call and the DPMS off command to give X time to process the screen saver state change.	keybinding1/utils.go

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[sourcery-ai]

Hey - I've left some high level feedback:

• The hard-coded 100ms time.Sleep before calling dpms.ForceLevelChecked is a bit of a magic value; consider either documenting why this delay is needed or extracting it into a named constant so future maintainers understand and can tune it more easily.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The hard-coded 100ms `time.Sleep` before calling `dpms.ForceLevelChecked` is a bit of a magic value; consider either documenting why this delay is needed or extracting it into a named constant so future maintainers understand and can tune it more easily.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: applyforprof

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