Use readonly properties where possible

resources/qml/MessageView.qml

@@ -43,7 +43,7 @@ ScrollView {
             property alias model: row.model
             // use comma to update on scroll
             property var attachedPos: chat.contentY, attached ? chat.mapFromItem(attached, attached ? attached.width - width : 0, -height) : null
-            property int padding: 4
+            readonly property int padding: 4
 
             visible: Settings.buttonsInTimeline && !!attached && (attached.hovered || messageActionHover.hovered)
             x: attached ? attachedPos.x : 0

resources/qml/TimelineView.qml

@@ -20,7 +20,7 @@ Page {
     property var colors: currentActivePalette
     property var systemInactive
     property var inactiveColors: currentInactivePalette ? currentInactivePalette : systemInactive
-    property int avatarSize: 40
+    readonly property int avatarSize: 40
     property real highlightHue: colors.highlight.hslHue
     property real highlightSat: colors.highlight.hslSaturation
     property real highlightLight: colors.highlight.hslLightness

resources/qml/ui/Ripple.qml

@@ -13,9 +13,9 @@ Item {
     property real radius: 0
     property color color: "#22000000"
     property real maxRadius: Math.max(width, height)
-    property real radiusAnimationRate: 0.05
+    readonly property real radiusAnimationRate: 0.05
-    property real radiusTailAnimationRate: 0.5
+    readonly property real radiusTailAnimationRate: 0.5
-    property real opacityAnimationDuration: 300
+    readonly property real opacityAnimationDuration: 300
     readonly property real diameter: radius * 2
     property real centerX
     property real centerY