Fix desktop catalog dialog freezing (list not displayed, selection not switching)

[Copilot]

DesktopCatalogViewModel.Setup() ran its post-await continuation on a thread-pool (MTA) thread due to ConfigureAwait(false). All subsequent operations — GetWallpaperPath, GetCurrent (COM calls requiring STA), and SelectedDesktop assignment (triggers Switch → PopupOverlay, UI ops) — were executing on the wrong thread, causing COM marshaling deadlocks against the busy UI thread.

Change

Remove .ConfigureAwait(false) from configStore.Load() in Setup() so the continuation resumes on the captured STA/UI thread. Config I/O stays async inside ConfigStore.Load().

// Before
var config = await this.configStore.Load().ConfigureAwait(false);

// After
var config = await this.configStore.Load();

Original prompt

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This section details on the original issue you should resolve

<issue_title>デスクトップ一覧ダイアログが固まる</issue_title>
<issue_description>- 一覧が表示されない

• 一覧の選択が切り替わらない</issue_description>

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

@Freeesia 一覧の取得を非同期化する

• Fixes デスクトップ一覧ダイアログが固まる #142

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