fix: use scene graph blur for uninstall confirmation dialog

Replaces KWin blur (enableBlurWindow: true) with StyledBehindWindowBlur
scene graph blur on confirmUninstallDlg, matching the windowed launcher's
approach. KWin blur was influenced by content behind the dialog (dark
fullscreen launcher or desktop wallpaper), causing gray/dark appearance.

- Set color: transparent to let blur show through
- DWindow.enableBlurWindow: false to disable KWin compositor blur
- DWindow.themeType: DTK.themeType to follow system theme
- StyledBehindWindowBlur with proper blend colors for light/dark themes

Bug: https://pms.uniontech.com/bug-view-359629.html

Author: robertkill

shell-launcher-applet/package/launcheritem.qml

@@ -304,22 +304,34 @@ AppletItem {
         property string appId: ""
         property string appName: ""
 
+        color: "transparent"
+        DWindow.themeType: DTK.themeType
+        DWindow.enableBlurWindow: false
         DLayerShellWindow.anchors: DLayerShellWindow.AnchorNone
 
-        minimumWidth: layout.implicitWidth + 2 * DStyle.Style.dialogWindow.contentHMargin
-        minimumHeight: layout.implicitHeight + DStyle.Style.dialogWindow.titleBarHeight
-        maximumWidth: minimumWidth
-        maximumHeight: minimumHeight
+        StyledBehindWindowBlur {
+            id: behindBlur
+            anchors.fill: parent
+            control: parent
+            blendColor: DStyle.Style.control.selectColor(undefined,
+                Qt.rgba(235 / 255.0, 235 / 255.0, 235 / 255.0, 0.6),
+                Qt.rgba(0, 0, 0, 85 / 255.0))
+        }
 
         onVisibleChanged: {
             if (!visible) {
                 LauncherController.setAvoidHide(true)
                 if (LauncherController.currentFrame === "FullscreenFrame") {
-                    fullscreenFrame.requestActivate() 
-                } 
+                    fullscreenFrame.requestActivate()
+                }
             }
         }
 
+        minimumWidth: layout.implicitWidth + 2 * DStyle.Style.dialogWindow.contentHMargin
+        minimumHeight: layout.implicitHeight + DStyle.Style.dialogWindow.titleBarHeight
+        maximumWidth: minimumWidth
+        maximumHeight: minimumHeight
+
         ColumnLayout {
             id: layout
             spacing: 0