fix: support dual key bindings for Ctrl+Shift layout switching

Return two key combinations for Ctrl+Shift shortcut instead of single value.

Ctrl+Shift快捷键返回两组按键组合，支持多组快捷键写入配置。

Log: 修复Ctrl+Shift切换快捷键支持双按键组合
PMS: BUG-357563
Influence: Ctrl+Shift布局切换快捷键现在支持两组按键绑定，切换行为更准确。

Author: wyu71

src/dcc-fcitx5configtool/qml/ShortcutsModule.qml

@@ -191,10 +191,12 @@ DccObject {
             return ""
         }
         let value = enumKeys[index]
-        
-        if (value === "Ctrl+Shift") value = "CTRL_SHIFT"
+
+        if (value === "Ctrl+Shift") {
+            return [["Control", "Shift_L"], ["Control", "Shift", "Control_L"]]
+        }
         if (value === "Alt+Shift") value = "ALT_SHIFT"
-        
+
         if (value === "None") {
             return ""
         }
@@ -248,9 +250,22 @@ DccObject {
 
             // 只在用户激活选择时写回，避免程序化更新触发写回
             onActivated: {
-                dccData.fcitx5ConfigProxy.setValue(
-                            "Hotkey/EnumerateForwardKeys/0",
-                            reverseEnumerateForwardKeys(currentIndex), true)
+                let reversed = reverseEnumerateForwardKeys(currentIndex)
+                if (Array.isArray(reversed) && Array.isArray(reversed[0])) {
+                    dccData.fcitx5ConfigProxy.setValue(
+                                "Hotkey/EnumerateForwardKeys/0",
+                                reversed[0], true)
+                    dccData.fcitx5ConfigProxy.setValue(
+                                "Hotkey/EnumerateForwardKeys/1",
+                                reversed[1], true)
+                } else {
+                    dccData.fcitx5ConfigProxy.setValue(
+                                "Hotkey/EnumerateForwardKeys/0",
+                                reversed, true)
+                    dccData.fcitx5ConfigProxy.setValue(
+                                "Hotkey/EnumerateForwardKeys/1",
+                                [""], true)
+                }
             }
         }
     }