fix(dropdown): respect Animation Duration setting for DankDropdown popups (#2661)

DankDropdown popups opened and closed at a fixed speed regardless of the
configured Animation Duration. The Popup inherited Qt Material's default
enter/exit transitions, whose durations are hardcoded and never reference
Theme.shortDuration.

Override enter/exit with theme-driven transitions that keep the Material
grow/fade look (scale + opacity) but read their duration from
Theme.shortDuration, so every DankDropdown instance follows the
animation-speed setting.

Fixes #2659

quickshell/Widgets/DankDropdown.qml

@@ -289,6 +289,40 @@ Item {
         dim: false
         closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutside
 
+        enter: Transition {
+            NumberAnimation {
+                property: "scale"
+                from: 0.9
+                to: 1
+                duration: Theme.shortDuration
+                easing.type: Theme.emphasizedEasing
+            }
+            NumberAnimation {
+                property: "opacity"
+                from: 0
+                to: 1
+                duration: Theme.shortDuration
+                easing.type: Theme.standardEasing
+            }
+        }
+
+        exit: Transition {
+            NumberAnimation {
+                property: "scale"
+                from: 1
+                to: 0.9
+                duration: Theme.shortDuration
+                easing.type: Theme.emphasizedEasing
+            }
+            NumberAnimation {
+                property: "opacity"
+                from: 1
+                to: 0
+                duration: Theme.shortDuration
+                easing.type: Theme.standardEasing
+            }
+        }
+
         background: Rectangle {
             color: "transparent"
         }