opt: enum

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/models/common/dynamic/up_panel_position.dart

@@ -0,0 +1,10 @@
+enum UpPanelPosition {
+  leftFixed,
+  rightFixed,
+  leftDrawer,
+  rightDrawer,
+}
+
+extension UpPanelPositionExt on UpPanelPosition {
+  String get labels => const ['左侧常驻', '右侧常驻', '左侧抽屉', '右侧抽屉'][index];
+}