fix(viewer): enable navigation in the image information dialog

[Resurgamz]

Summary

Opening the image information dialog moves the active shortcut context away
from the viewer window, preventing the existing Left and Right window
shortcuts from switching images.

Add Left and Right shortcuts to the information dialog and forward them to
the existing image navigation handlers. Remove the incorrect
setFocus(Qt::NoFocusReason) call, which sets focus instead of clearing it.

打开图片信息窗口后，主看图窗口的左右方向键快捷键失去活动窗口上下文，
导致无法切换图片。本修改在图片信息窗口中增加左右方向键处理，并将请求
转发至现有切图逻辑，同时移除错误的焦点设置。

Log: 修复打开图片信息后无法使用左右方向键切换图片的问题
Bug: https://pms.uniontech.com/bug-view-375299.html
Influence: 图片信息窗口打开时可使用左右方向键切图并同步刷新图片信息。

Verification

• libimageviewer builds successfully.
• git diff --check passes.
• The full test target is blocked by the existing unrelated
  OnFinishPinchAnimal compilation error in
  tests/test_LibImageGraphicsView.cpp.

Summary by Sourcery

Enable image navigation from the information dialog by forwarding its arrow-key actions to the viewer’s existing previous and next image handlers.

New Features:

• Enable Left and Right arrow-key navigation while the image information dialog is open.

Bug Fixes:

• Restore image switching from the information dialog and keep its displayed metadata synchronized with the selected image.

Enhancements:

• Remove the incorrect focus-setting call when opening the information dialog.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The information dialog now owns window-scoped Left and Right shortcuts, forwards their signals to the existing image navigation handlers, and removes the incorrect focus call used during dialog display. Review the shortcut context, signal wiring, and behavior when navigation refreshes the displayed image information.

Sequence diagram for image navigation from the information dialog

sequenceDiagram
    participant User
    participant ExtensionPanel
    participant LibViewPanel
    participant ImageViewer
    participant LibImageInfoWidget

    User->>ExtensionPanel: Left or Right key
    ExtensionPanel->>ExtensionPanel: previousRequested or nextRequested
    ExtensionPanel->>LibViewPanel: showPrevious or showNext
    LibViewPanel->>ImageViewer: navigate to adjacent image
    LibViewPanel->>LibImageInfoWidget: setImagePath
    LibImageInfoWidget-->>User: Refresh image information

Loading

File-Level Changes

Change	Details	Files
Add dialog-local left/right navigation and route it through the existing viewer navigation flow.	Create window-scoped shortcuts for Left and Right in the information dialog. Emit navigation request signals and connect them to the panel’s existing previous/next image handlers. Allow the viewer’s image and information dialog state to refresh through the established navigation logic.	libimageviewer/widgets/extensionpanel.cpp libimageviewer/widgets/extensionpanel.h libimageviewer/viewpanel/viewpanel.cpp
Remove the incorrect focus API call when opening the information dialog.	Delete the setFocus(Qt::NoFocusReason) invocation so opening the dialog no longer applies an invalid focus-setting operation.	libimageviewer/viewpanel/viewpanel.cpp

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[sourcery-ai]

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: max-lvs, Resurgamz

The full list of commands accepted by this bot can be found here.

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• debian/deepin/OWNERS

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[Resurgamz]

/merge