refactor: dyn dispatch via handle_event (cce-ui 6bd direct-dispatch collapse)

The per-method entry points left WidgetHost; dyn-pointer deliveries build
the equivalent Event and hand it to handle_event — the same funnel the
entry points forwarded to.

Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_018u7qTwzX95dd5ysAkaSCLk

 src/json_layout.rs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/json_layout.rs b/src/json_layout.rs
index 0783000..cdbf4cf 100644
--- a/src/json_layout.rs
+++ b/src/json_layout.rs
@@ -407,9 +407,11 @@ impl JsonLayoutWidget {
             Event::PointerMove { x, y, .. } => {
                 if let Some(idx) = self.dragging_slider_idx {
                     if let Some(w) = self.widgets.get_mut(idx) {
-                        // drag_update is an WidgetHost method (the Adapted forward supplies the
-                        // widget's rect); call it on the box, not a concrete downcast.
-                        if w.widget.as_dyn_mut().drag_update(*x, *y) {
+                        // Drag* events map onto the Input drag hooks in handle_event (6bd
+                        // collapse); the ctx is unused on that path.
+                        let mut dummy = cce_ui::context::UiContext::new();
+                        let ev = Event::DragUpdate { dx: 0.0, dy: 0.0, x: *x, y: *y, local_x: *x, local_y: *y };
+                        if w.widget.as_dyn_mut().handle_event(&ev, &mut dummy) {
                             changed = true;
                         }
                     }