Dismiss preview window when opening files through Open With action

[BerryUIKI]

PR Checklist

• Functionality has been tested, no obvious bugs
• Code style follows project conventions
• Documentation/comments updated (if applicable)

Brief Description of Changes

• In ViewerWindow.xaml.cs, clicking the "Open With" button (buttonOpenWith) previously launched ShareHelper.Share(_path, this, true) (invoking rundll32.exe shell32.dll,OpenAs_RunDLL) but left the QuickLook preview window open on screen.
• Updated buttonOpenWith.Click to dismiss the preview window (Close() if pinned, or ViewWindowManager.GetInstance().ClosePreview()), matching the closing behavior of the default "Open with [App]" button (buttonOpen).

Related Issue (if any)

Fixes #1267

Additional Notes

Tested opening various file types via the Open With dialog. The QuickLook window cleanly closes upon invoking the system dialog.

Summary by Sourcery

Bug Fixes:

• Close the QuickLook preview window when invoking the system Open With action.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The Open With action now dismisses the QuickLook preview after invoking the system dialog, closing pinned windows directly and delegating unpinned previews to ViewWindowManager; the file header’s BOM was also removed.

Sequence diagram for dismissing the preview after Open With

sequenceDiagram
    participant User
    participant ViewerWindow
    participant ShareHelper
    participant ViewWindowManager
    participant SystemDialog

    User->>ViewerWindow: buttonOpenWith.Click
    ViewerWindow->>ShareHelper: Share(_path, this, true)
    ShareHelper->>SystemDialog: OpenAs_RunDLL
    alt Pinned
        ViewerWindow->>ViewerWindow: Close()
    else Unpinned
        ViewerWindow->>ViewWindowManager: GetInstance()
        ViewWindowManager->>ViewWindowManager: ClosePreview()
    end

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File-Level Changes

Change	Details	Files
Close the QuickLook preview after launching the system Open With dialog, using the same pinned-versus-managed-preview behavior as the existing close flow.	Continue launching the system Open With dialog through the existing share helper. Close the current window directly when pinned. Otherwise request preview closure through the window manager.	QuickLook/ViewerWindow.xaml.cs
Normalize the file header encoding marker without changing the copyright text.	Remove the leading byte-order mark from the source file.	QuickLook/ViewerWindow.xaml.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#1267	Close the QuickLook preview window when a file is opened through the 'Open With' action, including when the preview is pinned.	✅

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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