Fix title bar buttons and Windows tray hide

- Remove ui.interact() drag overlay that was stealing click events
  from the close/minimize buttons. Revert to inner.response.drag_started()
  which only fires on the background area.
- Use ViewportCommand::Visible(false/true) instead of Minimized on
  Windows so the window fully disappears from the taskbar when
  minimized to tray, and reappears on restore.

Author: fjh1997

src/gui.rs

@@ -578,10 +578,7 @@ impl AcceleratorApp {
             },
         );
 
-        // Enable drag on the title bar for window movement
-        let title_bar_response =
-            ui.interact(inner.response.rect, ui.id().with("title_bar_drag"), egui::Sense::drag());
-        if title_bar_response.drag_started() {
+        if inner.response.drag_started() {
             ctx.send_viewport_cmd(egui::ViewportCommand::StartDrag);
         }
 
@@ -1298,7 +1295,7 @@ impl AcceleratorApp {
             let _ = tray.tray_icon.set_visible(true);
             self.hidden_to_tray = true;
             self.last_minimized = true;
-            ctx.send_viewport_cmd(egui::ViewportCommand::Minimized(true));
+            ctx.send_viewport_cmd(egui::ViewportCommand::Visible(false));
             ctx.request_repaint();
         } else {
             self.feedback = "托盘不可用，已退回系统最小化".to_string();
@@ -1385,7 +1382,7 @@ impl AcceleratorApp {
         if let Some(tray) = &self.tray {
             let _ = tray.tray_icon.set_visible(false);
         }
-        ctx.send_viewport_cmd(egui::ViewportCommand::Minimized(false));
+        ctx.send_viewport_cmd(egui::ViewportCommand::Visible(true));
         ctx.send_viewport_cmd(egui::ViewportCommand::Focus);
         ctx.request_repaint();
     }