core, tests, ui: keep member order with role index, skip down-migration schema comparison, reload support list on return with older remote hosts

apps/ios/Shared/Model/ChatModel.swift

@@ -424,7 +424,6 @@ final class ChatModel: ObservableObject {
     @Published var groupMembers: [GMember] = []
     @Published var groupMembersIndexes: Dictionary<Int64, Int> = [:] // groupMemberId to index in groupMembers list
     @Published var membersLoaded = false
-    var membersLoadedGroupId: Int64?
     // Runtime-only relay hostnames for pre-join channel display, not persisted — lost on app restart.
     // APIConnectPreparedGroup re-fetches fresh relays at connect time, so stale data doesn't affect join.
     @Published var channelRelayHostnames: [Int64: [String]] = [:]
@@ -578,12 +577,9 @@ final class ChatModel: ObservableObject {
         let groupMembers = await apiListMembers(groupInfo.groupId)
         await MainActor.run {
             if chatId == groupInfo.id {
-                if let groupMembers {
-                    self.groupMembers = groupMembers.map { GMember.init($0) }
-                    self.populateGroupMembersIndexes()
-                    self.membersLoaded = true
-                    self.membersLoadedGroupId = groupInfo.groupId
-                }
+                self.groupMembers = groupMembers.map { GMember.init($0) }
+                self.populateGroupMembersIndexes()
+                self.membersLoaded = true
                 updateView()
             }
         }
@@ -1331,15 +1327,11 @@ final class ChatModel: ObservableObject {
     }
 
     func upsertSupportChatMember(_ cInfo: ChatInfo) {
-        if case let .group(groupInfo, .memberSupport(member?)?) = cInfo, chatId == groupInfo.id {
-            var m = member
-            var supportChatAdded = false
-            if let current = getGroupMember(member.groupMemberId)?.wrapped {
-                supportChatAdded = current.supportChat == nil && member.supportChat != nil
-                m = current
-                m.supportChat = member.supportChat
-                m.memberProfile = member.memberProfile
-            }
+        if case let .group(groupInfo, .memberSupport(member?)?) = cInfo {
+            var m = getGroupMember(member.groupMemberId)?.wrapped ?? member
+            let supportChatAdded = m.supportChat == nil && member.supportChat != nil
+            m.supportChat = member.supportChat
+            m.memberProfile = member.memberProfile
             _ = upsertGroupMember(groupInfo, m)
             if supportChatAdded {
                 objectWillChange.send()