fix(Communities): ensure app remembers hidden community intro banners

Fixes #1960

ui/app/AppLayouts/Chat/CommunityColumn.qml

@@ -128,7 +128,7 @@ Item {
 
         CommunityWelcomeBanner {
             id: emptyViewAndSuggestions
-            visible: chatsModel.communities.activeCommunity.admin
+            visible: !appSettings.hiddenCommunityWelcomeBanners.includes(chatsModel.communities.activeCommunity.id) && chatsModel.communities.activeCommunity.admin
             width: parent.width
             anchors.top: channelList.bottom
             anchors.topMargin: Style.current.padding

ui/app/AppLayouts/Chat/CommunityComponents/CommunityWelcomeBanner.qml

@@ -46,7 +46,9 @@ Rectangle {
         icon.width: 20
         iconColor: Style.current.darkGrey
         onClicked: {
-            // TODO make this saved in the settings
+            let hiddenBannerIds = appSettings.hiddenCommunityWelcomeBanners
+            hiddenBannerIds.push(chatsModel.communities.activeCommunity.id)
+            appSettings.hiddenCommunityWelcomeBanners = hiddenBannerIds
             root.visible = false
         }
     }

ui/app/AppMain.qml

@@ -91,6 +91,7 @@ RowLayout {
         property bool timelineEnabled: true
         property string locale: "en"
         property var recentEmojis: []
+        property var hiddenCommunityWelcomeBanners: []
         property real volume: 0.2
         property int notificationSetting: Constants.notifyAllMessages
         property bool notificationSoundsEnabled: true