UI.7: serialize docking actions for app command dispatch

crates/ui/src/docking/model.rs

@@ -94,6 +94,7 @@ pub struct Location<P> {
 }
 
 #[derive(Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub enum Action<P> {
     Move {
         panel: P,

crates/ui/tests/docking_workflows.rs

@@ -163,6 +163,9 @@ impl Harness {
         });
         self.renderer.handle_delta(&mut self.output.textures_delta);
         for action in actions {
+            // Apps send renderer actions through their JSON command boundary before applying.
+            #[cfg(feature = "serde")]
+            let action: Action<u32> = serde_json::from_value(serde_json::to_value(&action).unwrap()).unwrap();
             self.layout
                 .apply_with_permissions(action.clone(), |panel| if *panel == CANVAS { Permissions::PROTECTED } else { Permissions::default() })
                 .unwrap();

docs/ui-docking.md

@@ -59,6 +59,8 @@ The frontmost containing group blocks targets underneath even when it rejects a
 The optional `DockArea` renderer handles tab fitting and overflow, drag/drop previews,
 Escape/focus-loss cancellation, split dividers and floating-group resize grips. It renders a
 snapshot and returns `DockOutput.actions`; apply them through the application's command path.
+With `serde` enabled, `Action` also serializes so pointer, keyboard and control-channel requests
+can share that command path, including splitter changes, tab reorder and floating bounds.
 Panel body callbacks receive stable global egui IDs, so moving a panel does not reset its widget
 memory. The application should still keep durable panel/document data outside transient egui
 widget memory.