fix: move canvas context menu to content layer so right-click works

The context menu was on the background area (Order::Background) but the
content layer (Order::Middle) intercepted right-clicks first. Moved to
the content layer's background rect with Sense::click() so right-click
on empty canvas now correctly shows "Copy Link to Position".

Author: 190km

src/app.rs

@@ -667,33 +667,6 @@ impl eframe::App for VoidApp {
                     }
                 }
 
-                // Canvas context menu — Copy Link with coordinates + zoom
-                bg_resp.context_menu(|ui| {
-                    if ui.button("Copy Link to Position").clicked() {
-                        // Use the pointer position where the right-click happened
-                        let canvas_pos = ui
-                            .input(|i| i.pointer.hover_pos())
-                            .map(|pos| self.viewport.screen_to_canvas(pos, canvas_rect))
-                            .unwrap_or_else(|| {
-                                // Fallback: center of the visible canvas
-                                self.viewport.visible_canvas_rect(canvas_rect).center()
-                            });
-                        let ws_id = self.ws().id;
-                        let z = self.viewport.zoom;
-                        let url = format!(
-                            "void://open/{ws_id}/@{:.0},{:.0},{:.2}",
-                            canvas_pos.x, canvas_pos.y, z
-                        );
-                        if let Ok(mut clipboard) = arboard::Clipboard::new() {
-                            let _ = clipboard.set_text(&url);
-                        }
-                        let time = ui.input(|i| i.time);
-                        self.toast =
-                            Some(Toast::new("Position link copied to clipboard", 2.0, time));
-                        ui.close_menu();
-                    }
-                });
-
                 // Status bar: zoom level + pointer canvas coordinates (bottom-left)
                 let zoom_pct = format!("{:.0}%", self.viewport.zoom * 100.0);
                 let pointer_info = if let Some(pos) = ui.input(|i| i.pointer.hover_pos()) {
@@ -730,7 +703,7 @@ impl eframe::App for VoidApp {
             .show(ctx, |ui| {
                 ctx.set_transform_layer(ui.layer_id(), transform);
                 ui.set_clip_rect(clip);
-                ui.allocate_rect(clip, egui::Sense::hover());
+                let canvas_bg_resp = ui.allocate_rect(clip, egui::Sense::click());
 
                 let mut order: Vec<usize> = (0..self.ws().panels.len()).collect();
                 order.sort_by_key(|&i| self.ws().panels[i].z_index());
@@ -898,6 +871,33 @@ impl eframe::App for VoidApp {
                     }
                 }
 
+                // Canvas context menu — Copy Link with coordinates + zoom
+                // Placed in the content layer (Order::Middle) so it receives right-clicks
+                // that the background layer (Order::Background) would miss.
+                canvas_bg_resp.context_menu(|ui| {
+                    if ui.button("Copy Link to Position").clicked() {
+                        let canvas_pos = ui
+                            .input(|i| i.pointer.hover_pos())
+                            .map(|pos| self.viewport.screen_to_canvas(pos, canvas_rect))
+                            .unwrap_or_else(|| {
+                                self.viewport.visible_canvas_rect(canvas_rect).center()
+                            });
+                        let ws_id = self.ws().id;
+                        let z = self.viewport.zoom;
+                        let url = format!(
+                            "void://open/{ws_id}/@{:.0},{:.0},{:.2}",
+                            canvas_pos.x, canvas_pos.y, z
+                        );
+                        if let Ok(mut clipboard) = arboard::Clipboard::new() {
+                            let _ = clipboard.set_text(&url);
+                        }
+                        let time = ui.input(|i| i.time);
+                        self.toast =
+                            Some(Toast::new("Position link copied to clipboard", 2.0, time));
+                        ui.close_menu();
+                    }
+                });
+
                 // Draw snap guides
                 let painter = ui.painter();
                 let guide_stroke =