Theme consistency overhaul:

- Add surface shift option, start from surface by default (previously
  was surfaceContainer). Old colors can be attained by changing it back
to "container" in theme colors
- Remove borders on surface elements, mostly
- Fix popup distances
- Use surfaceContainer/sch by default on widgets

Modules/ControlCenter/Widgets/ToggleButton.qml

@@ -23,15 +23,13 @@ Rectangle {
     }
 
     readonly property color _tileBgActive: Theme.primary
-    readonly property color _tileBgInactive:
-        Qt.rgba(Theme.surfaceVariant.r, Theme.surfaceVariant.g, Theme.surfaceVariant.b,
-                Theme.getContentBackgroundAlpha() * 0.60)
+    readonly property color _tileBgInactive: Theme.surfaceContainerHigh
     readonly property color _tileRingActive:
         Qt.rgba(Theme.primaryText.r, Theme.primaryText.g, Theme.primaryText.b, 0.22)
 
     color: isActive ? _tileBgActive : _tileBgInactive
     border.color: isActive ? _tileRingActive : Qt.rgba(Theme.outline.r, Theme.outline.g, Theme.outline.b, 0.08)
-    border.width: isActive ? 1 : 1
+    border.width: 0
     opacity: enabled ? 1.0 : 0.6
 
     function hoverTint(base) {
@@ -39,9 +37,7 @@ Rectangle {
         return Theme.isLightMode ? Qt.darker(base, factor) : Qt.lighter(base, factor)
     }
 
-    readonly property color _containerBg:
-        Qt.rgba(Theme.surfaceVariant.r, Theme.surfaceVariant.g, Theme.surfaceVariant.b,
-                Theme.getContentBackgroundAlpha() * 0.60)
+    readonly property color _containerBg: Theme.surfaceContainerHigh
 
     Rectangle {
         anchors.fill: parent