feat(statusbar): quick properties floating panel (QP pill)

When the QP pill is on, a compact floating panel appears at the canvas
top-left on selection, reusing the docked panel's editable section rows.
Toggleable from the status-bar customization menu.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

src/app/mod.rs

@@ -179,6 +179,8 @@ pub(super) struct OpenCADStudio {
     isolate_popup_open: bool,
     /// Clean-screen mode: hide ribbon and side panels for a full canvas.
     clean_screen: bool,
+    /// Quick Properties: show a compact floating property panel on selection.
+    quick_properties: bool,
     /// Which status-bar pills the user has chosen to show (persisted).
     statusbar_config: crate::ui::statusbar_config::StatusBarConfig,
     /// Whether Tangent snap was enabled before a tangent-pick command started.
@@ -752,6 +754,8 @@ pub enum Message {
     ToggleCleanScreen,
     /// Toggle whether entity transparency is shown on screen.
     ToggleTransparencyDisplay,
+    /// Toggle the Quick Properties floating panel.
+    ToggleQuickProperties,
     /// Toggle the drawing-units picker open/closed.
     ToggleUnitsPopup,
     /// Close the drawing-units picker.
@@ -1223,6 +1227,7 @@ impl OpenCADStudio {
             isolate_popup_open: false,
             statusbar_config: crate::ui::statusbar_config::StatusBarConfig::load(),
             clean_screen: false,
+            quick_properties: false,
             pre_cmd_tangent: None,
             ortho_mode: false,
             polar_mode: false,

src/app/update.rs

@@ -3590,6 +3590,10 @@ impl OpenCADStudio {
                 }
                 Task::none()
             }
+            Message::ToggleQuickProperties => {
+                self.quick_properties ^= true;
+                Task::none()
+            }
             Message::ToggleUnitsPopup => {
                 self.units_popup_open ^= true;
                 Task::none()

src/app/view.rs

@@ -1005,6 +1005,15 @@ impl OpenCADStudio {
             }
         }
 
+        // Quick Properties: compact floating property panel on selection,
+        // anchored at the canvas top-left so it doesn't track the cursor.
+        if self.quick_properties && !tab.is_start {
+            if let Some(panel) = tab.properties.quick_view() {
+                viewport_stack = viewport_stack
+                    .push(position_canvas_overlay(iced::Point::new(12.0, 12.0), panel));
+            }
+        }
+
         // Right-click context menu. Lives inside the viewport stack so
         // the cursor position (canvas-relative) anchors the menu under
         // the cursor instead of drifting into window-relative space.
@@ -1163,6 +1172,7 @@ impl OpenCADStudio {
                         self.units_popup_open,
                         tab.scene.is_isolation_active(),
                         tab.scene.transparency_display,
+                        self.quick_properties,
                         &self.statusbar_config,
                     )
                 })