feat(ui): implement 1-click presets, real-time search & filter bar, batch queue actions, and file inspector

src/Everything2Everything.Tests/BatchQueueActionsTests.cs

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+using System.Collections.ObjectModel;
+using System.IO;
+using Everything2Everything.App.Views;
+using Xunit;
+
+namespace Everything2Everything.Tests;
+
+/// <summary>
+/// 큐 일괄 처리(Batch Actions) TDD 단위 테스트 스위트
+/// 전체 선택/해제, 선택 항목 삭제, 완료 항목 정리, 일괄 출력 형식 변경 검증
+/// </summary>
+public class BatchQueueActionsTests
+{
+    private static QueueItem CreateItem(string path, string outExt = ".jpg") =>
+        new()
+        {
+            SourcePath = path,
+            FileName = Path.GetFileName(path),
+            SelectedOutputExtension = outExt,
+            StateText = "queued",
+        };
+
+    [Fact]
+    public void BatchChangeOutput_UpdatesEligibleItems()
+    {
+        var items = new ObservableCollection<QueueItem>
+        {
+            CreateItem("a.png", ".jpg"),
+            CreateItem("b.png", ".jpg"),
+            CreateItem("c.mp4", ".mp4"),
+        };
+
+        // .webp 지원 여부에 따라 이미지(a.png, b.png)만 .webp로 일괄 변경
+        BatchQueueService.BatchChangeOutput(items, ".webp", new[] { ".png", ".jpg" });
+
+        Assert.Equal(".webp", items[0].SelectedOutputExtension);
+        Assert.Equal(".webp", items[1].SelectedOutputExtension);
+        Assert.Equal(".mp4", items[2].SelectedOutputExtension); // mp4는 제외
+    }
+
+    [Fact]
+    public void RemoveSelected_RemovesOnlySelectedItems()
+    {
+        var items = new ObservableCollection<QueueItem>
+        {
+            CreateItem("1.png"),
+            CreateItem("2.png"),
+            CreateItem("3.png"),
+        };
+        items[0].IsSelected = true;
+        items[2].IsSelected = true;
+
+        BatchQueueService.RemoveSelected(items);
+
+        Assert.Single(items);
+        Assert.Equal("2.png", items[0].FileName);
+    }
+
+    [Fact]
+    public void ClearCompleted_RemovesOnlyDoneItems()
+    {
+        var i1 = CreateItem("1.png"); i1.SetState("done");
+        var i2 = CreateItem("2.png"); i2.SetState("45%");
+        var i3 = CreateItem("3.png"); i3.SetState("queued");
+        var i4 = CreateItem("4.png"); i4.SetState("done");
+
+        var items = new ObservableCollection<QueueItem> { i1, i2, i3, i4 };
+
+        BatchQueueService.ClearCompleted(items);
+
+        Assert.Equal(2, items.Count);
+        Assert.All(items, item => Assert.False(item.IsDone));
+    }
+
+    [Fact]
+    public void SelectAll_TogglesAllItems()
+    {
+        var items = new ObservableCollection<QueueItem>
+        {
+            CreateItem("1.png"),
+            CreateItem("2.png"),
+        };
+
+        BatchQueueService.SetSelectionAll(items, true);
+        Assert.All(items, item => Assert.True(item.IsSelected));
+
+        BatchQueueService.SetSelectionAll(items, false);
+        Assert.All(items, item => Assert.False(item.IsSelected));
+    }
+}