Fix label editing view

CHDataManagement/Views/Pages/Commands/LabelCreationView.swift

@@ -10,7 +10,7 @@ struct LabelCreationView: View {
 
     var body: some View {
         List {
-            ForEach($labels) { label in
+            ForEach($labels, id: \.icon) { label in
                 HStack {
                     Button(action: { remove(label.wrappedValue) }) {
                         Image(systemSymbol: .minusCircleFill)
@@ -32,13 +32,13 @@ struct LabelCreationView: View {
     }
 
     private func addLabel() {
-        var label = ContentLabel(icon: .statisticsTime, value: "Value")
-        var number = 0
-        while labels.contains(label) {
-            number += 1
-            label.value = "Value \(number)"
+        for icon in PageIcon.allCases {
+            if labels.contains(where: { $0.icon == icon }) {
+                continue
+            }
+            labels.append(.init(icon: icon, value: "Value"))
+            return
         }
-        labels.append(label)
     }
 
     private func remove(_ label: ContentLabel) {