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 <noreply@anthropic.com>

src/ui/statusbar.rs

@@ -63,6 +63,8 @@ impl StatusBar {
         isolation_active: bool,
         // Whether entity transparency is shown (Transparency pill state).
         transparency_display: bool,
+        // Whether the Quick Properties floating panel is enabled.
+        quick_properties: bool,
         // Which pills the user has chosen to show on the bar.
         config: &'a StatusBarConfig,
     ) -> Element<'a, Message> {
@@ -193,6 +195,12 @@ impl StatusBar {
                 "Isolate Objects\nClick for Isolate / Hide / End",
             ));
         }
+        if vis(StatusPill::QuickProps) {
+            right_status = right_status.push(tip(
+                toggle_pill("QP", quick_properties, Message::ToggleQuickProperties),
+                "Quick Properties\nFloating panel on selection",
+            ));
+        }
         if vis(StatusPill::Vp) && !vp_label.is_empty() {
             right_status = right_status.push(tip(
                 status_pill(vp_label).into(),