fix: subtitle auto-loading regression from PR #676

[Copilot]

PR #676 removed NeighboringFilesQuery from the Playlist model, breaking subtitle auto-detection for videos. CompositeTrackPickerViewModel could no longer access the file query needed to search for subtitle files matching the video filename in the same directory.

Changes

Pass NeighboringFilesQuery through message pipeline:

• Add NeighboringFilesQuery property to PlaylistCurrentItemChangedMessage
• Update MediaListViewModel to include _neighboringFilesQuery when sending the message
• Modify CompositeTrackPickerViewModel.GetSubtitlesForFile() to accept and use the query from the message

Restore original subtitle detection logic:

// When query is available, filter neighboring files for matching subtitles
if (neighboringFilesQuery != null)
{
    IReadOnlyList<StorageFile> files = await neighboringFilesQuery.GetFilesAsync(0, 50);
    subtitles = files.Where(f =>
            f.IsSupportedSubtitle() && f.Name.StartsWith(
                Path.GetFileNameWithoutExtension(sourceFile.Name),
                StringComparison.OrdinalIgnoreCase))
        .ToArray();
}

This reuses the existing query from the playlist rather than creating a new one, matching pre-#676 behavior while maintaining the architectural improvements.

Warning

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>cannot load subtitles automatically</issue_title>
<issue_description>Describe the bug
I name the subtitle files the same as video files. But when I open the video files, subtitles cannot load automatically, even if I set the option --sub-autodetect-fuzzy = (I tried 0 to 2)

Screenshots

This is how I name the file.

This is how it shows.

Environment

• OS: Windows 11 26200.7171
• App Version: 0.17.0.0
  </issue_description>

<agent_instructions>This is a regression introduced in #676 that removed the logic that allow CompositeTrackPickerViewModel to get the current active NeighboringFilesQuery. The Playlist instance returned by PlaylistRequestMessage no longer has a reference to a NeighboringFilesQuery anymore. It's probably better to include the current NeighboringFilesQuery in the PlaylistCurrentItemChangedMessage.

StorageFileQueryResult? query = Messenger.Send<PlaylistRequestMessage>().Response.NeighboringFilesQuery;
            if (query != null)
            {
                try
                {
                    IReadOnlyList<StorageFile> files = await query.GetFilesAsync(0, 50);
                    subtitles = files.Where(f =>
                            f.IsSupportedSubtitle() && f.Name.StartsWith(
                                Path.GetFileNameWithoutExtension(sourceFile.Name),
                                StringComparison.OrdinalIgnoreCase))
                        .ToList();
                }
                catch (Exception e)
                {
                    LogService.Log(e);
                }
            }
```</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
<comment_new><author>@huynhsontung</author><body>
Sorry for the late response, but this was certainly a regression in v0.17.0, created from huynhsontung/Screenbox#676. The `CompositeTrackPickerViewModel` no longer had access to the neighbouring file query that was used to check for available subtitle files in the same folder. App version 0.16.x should not have this issue.</body></comment_new>
</comments>

• Fixes cannot load subtitles automatically #736

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