refactor: compress Task.category picker

Todos/View/TaskView.swift

@@ -65,7 +65,9 @@ struct TaskView: View {
               ForEach(allGroups) { group in
                 Text(group.name)
               }
-            }.focused($isFocused)
+            }
+            .fixedSize(horizontal: true, vertical: false)
+            .focused($isFocused)
           }
         }
       }