Clean up bookmark nits: HandleExceptions, dead method, asset typo

- Route the bookmarks pane's double-click and next/previous navigation through
  HandleExceptions() rather than discarding the Task with `_ =`, so an exception
  raised during navigation reaches the global handler instead of vanishing.
- Drop the unused parameterless NextDefaultName() overload.
- Rename the misspelled Boomark.Disable.svg asset (and its loader string) to
  Bookmark.Disable.svg.

Assisted-by: Claude:claude-opus-4-8:Claude Code

ILSpy/Bookmarks/BookmarkManager.cs

@@ -204,8 +204,6 @@ namespace ICSharpCode.ILSpy.Bookmarks
 			}
 		}
 
-		string NextDefaultName() => NextDefaultName(Bookmarks);
-
 		static string NextDefaultName(IEnumerable<Bookmark> bookmarks)
 		{
 			// Pick the lowest unused "Bookmark{n}" so names stay stable and unsurprising.

ILSpy/Bookmarks/BookmarksPane.axaml.cs

@@ -35,7 +35,7 @@ namespace ICSharpCode.ILSpy.Bookmarks
 		{
 			if (DataContext is BookmarksPaneModel model && BookmarkGrid.SelectedItem is Bookmark bookmark)
 			{
-				_ = model.ActivateAsync(bookmark);
+				model.ActivateAsync(bookmark).HandleExceptions();
 				e.Handled = true;
 			}
 		}

ILSpy/Bookmarks/BookmarksPaneModel.cs

@@ -133,7 +133,7 @@ namespace ICSharpCode.ILSpy.Bookmarks
 		{
 			int index = SelectedBookmark != null ? Bookmarks.IndexOf(SelectedBookmark) : -1;
 			if (NextEnabledIndex(Bookmarks.Select(b => b.Enabled).ToList(), index, delta) is { } next)
-				_ = ActivateAsync(Bookmarks[next]);
+				ActivateAsync(Bookmarks[next]).HandleExceptions();
 		}
 
 		/// <summary>

ILSpy/Images.cs

@@ -86,10 +86,9 @@ namespace ICSharpCode.ILSpy
 		public static readonly IImage ShowPrivateInternal = LoadSvg(nameof(ShowPrivateInternal));
 		public static readonly IImage ShowAll = LoadSvg(nameof(ShowAll));
 
-		// Bookmarks (file names carry dots, so they can't use nameof; "Boomark.Disable" is the
+		// Bookmarks (file names carry dots, so the dotted variants can't use nameof).
-		// asset's actual -- misspelled -- file name).
 		public static readonly IImage Bookmark = LoadSvg(nameof(Bookmark));
-		public static readonly IImage BookmarkDisable = LoadSvg("Boomark.Disable");
+		public static readonly IImage BookmarkDisable = LoadSvg("Bookmark.Disable");
 		public static readonly IImage BookmarkNext = LoadSvg("Bookmark.Next");
 		public static readonly IImage BookmarkPrevious = LoadSvg("Bookmark.Previous");
 		public static readonly IImage BookmarkNextInFile = LoadSvg("Bookmark.Next.File");