Address reviewer follow-ups: powerProfile detect, slider live-value, glyphs

- powerProfile now hides on machines without power-profiles-daemon by
  checking against the published profile set rather than a never-undefined
  enum, and uses mdi-scale-balance for Balanced (not battery-charging).
- networkPanel renames the QML-keyword-shadowing 'signal' property to
  'signalStrength'; ethernet glyph corrected to mdi-ethernet (not the
  access-point icon).
- workspacesPro indicator color guards against null bar during construction.
- Common.Slider keeps an internal liveValue so external value bindings
  survive a drag; sliders fed from PipeWire/brightnessctl now follow
  external changes after the user interacts.
- audioPanel drops the redundant default-sink PwObjectTracker since the
  candidate-sinks tracker already covers it.
- networkPanel guards scan/connect commands against re-entry while the
  previous Process is running.
- notificationCenter only instantiates its NotificationServer when the
  module is opted in via settings.replaceMako (default off) so it does
  not collide with mako out of the box.
- PopupCard fully opaque while open (previously 0.98) — removes a
  visible ghost outline on first render.
- Drop dead code: calendar trailing MouseArea, weatherFlyout's unused
  parseForecast/forecast property, idleInhibitor's holdSeconds,
  media's scrollAnim.position; gate media's scroll animation off in
  vertical bar mode.

default/quickshell/bar/widgets/notificationCenter.qml

@@ -23,31 +23,42 @@ Item {
     return "󰂚"
   }
 
-  NotificationServer {
-    id: server
-    keepOnReload: false
-    bodySupported: true
-    actionsSupported: true
-    imageSupported: true
+  property bool replaceMako: settings && settings.replaceMako === true
 
-    onNotification: function(notification) {
-      if (root.dnd) {
-        notification.expire()
-        return
+  Loader {
+    active: root.replaceMako
+    sourceComponent: serverComponent
+  }
+
+  Component {
+    id: serverComponent
+
+    NotificationServer {
+      id: server
+      keepOnReload: false
+      bodySupported: true
+      actionsSupported: true
+      imageSupported: true
+
+      onNotification: function(notification) {
+        if (root.dnd) {
+          notification.expire()
+          return
+        }
+        notification.tracked = true
+        var snapshot = {
+          id: notification.id,
+          app: notification.appName,
+          summary: notification.summary,
+          body: notification.body,
+          time: new Date(),
+          ref: notification
+        }
+        var next = root.stored.slice()
+        next.unshift(snapshot)
+        if (next.length > 30) next.pop()
+        root.stored = next
       }
-      notification.tracked = true
-      var snapshot = {
-        id: notification.id,
-        app: notification.appName,
-        summary: notification.summary,
-        body: notification.body,
-        time: new Date(),
-        ref: notification
-      }
-      var next = root.stored.slice()
-      next.unshift(snapshot)
-      if (next.length > 30) next.pop()
-      root.stored = next
     }
   }