refactor(ui): consolidate Theme.qml tokens and replace unicode glyphs with SVG icons

src/pygui/ISC/Tabs/SettingsTab.qml

@@ -1,5 +1,6 @@
 import QtQuick
 import QtQuick.Controls
+import QtQuick.Controls.impl
 import QtQuick.Layouts
 import QtQuick.Dialogs
 import ISC
@@ -123,19 +124,17 @@ Item {
                 ColorAnimation { duration: Theme.durationFast }
             }
 
-            Text {
+            IconImage {
                 anchors.centerIn: parent
-                text: "✓"
-                font.pixelSize: Theme.fontMd
-                font.bold: true
+                source: "icons/check.svg"
+                width: 12; height: 12
+                sourceSize.width: 12
+                sourceSize.height: 12
                 color: Theme.panelBackground
                 opacity: toggle.checked ? 1.0 : 0.0
                 Behavior on opacity {
                     NumberAnimation { duration: Theme.durationFast }
                 }
-                // Small nudge to center the checkmark perfectly
-                verticalAlignment: Text.AlignVCenter
-                horizontalAlignment: Text.AlignHCenter
             }
         }
 
@@ -366,7 +365,7 @@ Item {
                                 width: 22
                                 height: 22
                                 radius: height / 2
-                                color: "white"
+                                color: Theme.toggleThumb
                                 anchors.verticalCenter: parent.verticalCenter
                                 x: Theme.isDarkMode ? parent.width - width - 3 : 3
 
@@ -452,12 +451,9 @@ Item {
                 }
             }
 
-            Label {
+            Row {
                 anchors.centerIn: parent
-                text: "↓ Scroll for more"
-                font.pixelSize: Theme.fontSm
-                font.bold: true
-                color: Theme.bodyColor
+                spacing: 4
                 opacity: (settingsScroll.ScrollBar.vertical.position <= 0 && settingsScroll.contentHeight > settingsScroll.height) ? (scrollHintTimer.running ? 1 : 0) : 0
 
                 Behavior on opacity {
@@ -465,6 +461,22 @@ Item {
                         duration: 400
                     }
                 }
+
+                IconImage {
+                    anchors.verticalCenter: parent.verticalCenter
+                    source: "icons/chevron-down.svg"
+                    width: 14; height: 14
+                    sourceSize.width: 14
+                    sourceSize.height: 14
+                    color: Theme.bodyColor
+                }
+                Label {
+                    anchors.verticalCenter: parent.verticalCenter
+                    text: "Scroll for more"
+                    font.pixelSize: Theme.fontSm
+                    font.bold: true
+                    color: Theme.bodyColor
+                }
             }
         }
     }