Fix dish deletion list flicker with stable identity/order and add regression test

MealMood/Models/Dish.swift

@@ -23,3 +23,14 @@ final class Dish {
         self.createdAt = createdAt
     }
 }
+
+extension Dish {
+    static func stableSortedForDisplay(_ dishes: [Dish]) -> [Dish] {
+        dishes.sorted { lhs, rhs in
+            if lhs.createdAt != rhs.createdAt {
+                return lhs.createdAt > rhs.createdAt
+            }
+            return lhs.id.uuidString < rhs.id.uuidString
+        }
+    }
+}