fix: uninstall dialog shows dark theme in light mode

Root cause: fullscreen launcher forces DarkType (Main.qml:318),
the uninstall DialogWindow inherits it. DialogWindow.qml's
StyledBehindWindowBlur blendColor selects dark color under DarkType,
combined with KWin blur showing the dark launcher background,
resulting in a fully dark dialog.

Fix: override themeType to follow system theme and disable
enableBlurWindow on the DialogWindow. The two properties together
are sufficient - no custom StyledBehindWindowBlur needed.

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

Author: robertkill

shell-launcher-applet/package/launcheritem.qml

@@ -309,15 +309,6 @@ AppletItem {
         DWindow.enableBlurWindow: false
         DLayerShellWindow.anchors: DLayerShellWindow.AnchorNone
 
-        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)