fix(util): pin operator precedence in DrawArrows IconButton id

`id + 1.ToString()` resolves as `id.ToString() + "1"`, producing "01"
instead of "1" for the ArrowRight button. The single live caller
(DbViewer page navigation) still produced unique IDs by accident, but
the semantics were wrong. Explicit parentheses fix it.

HellionChat/Util/ImGuiUtil.cs

@@ -583,7 +583,9 @@ internal static class ImGuiUtil
 
         using (ImRaii.Disabled(isMax))
         {
-            if (IconButton(FontAwesomeIcon.ArrowRight, id + 1.ToString()))
+            // Parentheses pin the operator precedence: without them this resolves as
+            // id.ToString() + "1" (e.g. "01" instead of "1").
+            if (IconButton(FontAwesomeIcon.ArrowRight, (id + 1).ToString()))
                 selected++;
         }