refactor: replace keybind toggle with config checkbox for skeleton visibility

Removes the pynput/curl-based shortcut approach in favour of a plain
Plasma wallpaper config checkbox (ShowSkeleton). QML reads the setting
on page load and on change, calling setShowSkeleton() in JS directly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugin/contents/ui/main.qml

@@ -7,6 +7,15 @@ import org.kde.plasma.plasma5support as Plasma5Support
 WallpaperItem {
     id: root
 
+    function applyConfig() {
+        webView.runJavaScript("setShowSkeleton(" + Plasmoid.configuration.ShowSkeleton + ")")
+    }
+
+    Connections {
+        target: Plasmoid.configuration
+        function onShowSkeletonChanged() { applyConfig() }
+    }
+
     WebEngineView {
         id: webView
         anchors.fill: parent
@@ -24,6 +33,10 @@ WallpaperItem {
             request.accepted = true
         }
 
+        onLoadingChanged: function(loadRequest) {
+            if (loadRequest.status === WebEngineLoadRequest.LoadSucceededStatus)
+                applyConfig()
+        }
     }
 
     // Start CAVA on load