优化，贴图

src-tauri/src/constants.rs

@@ -10,6 +10,8 @@ pub mod windows {
     pub const OSD_OVERLAY: &str = "osd-overlay";
     #[allow(dead_code)]
     pub const SCREENSHOT_OVERLAY: &str = "screenshot-overlay";
+    #[allow(dead_code)]
+    pub const SCREENSHOT_PIN: &str = "screenshot-pin";
 }
 
 /// Tauri 事件名（与前端 constants::EVENTS 对应）
@@ -41,6 +43,7 @@ pub mod events {
     pub const OSD_END_DRAG: &str = "osd-end-drag";
     // 截图
     pub const SCREENSHOT_SHORTCUT: &str = "screenshot-shortcut";
+    pub const SCREENSHOT_PIN_SHORTCUT: &str = "screenshot-pin-shortcut";
     // 内核安装进度
     pub const KERNEL_INSTALL_PROGRESS: &str = "kernel-install-progress";
     // 进程与下载