fix(widget): TreeList is self-routing — its embedded children unlink from
the ctx tree (the recorded 6as routing latents)

mouse_body/move_body/key_body forward to every field widget internally, so
the router's children-first descent both double-delivered and STARVED the
tree-level logic: the hit add-key button consumed the press before
mouse_body's take_click toggle ran (popover never opened) and the wheel died
the same way — the two latents recorded at the 6as TreeList conversion.

register_embedded_children now registers WITHOUT link_ids: no tree children
means no descent, while registration keeps the ids resolvable for focus,
coverage, and the spatial grid, and the router's drag machinery still
drives the scrollbar thumb through the tree's Input drag hooks. Ramps keep
their links deliberately — they have no wheel arm, so their sliders' wheel
delivery still rides descent (their own starvation class stays recorded).

Verified live in cce-data-editor: the add-key popover OPENS on click and
the tree wheel SCROLLS (both dead before); row select + inline value
editor intact; 164 tests.

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

 src/widget/container/treelist.rs | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/src/widget/container/treelist.rs b/src/widget/container/treelist.rs
index 55f526b..21df9d4 100644
--- a/src/widget/container/treelist.rs
+++ b/src/widget/container/treelist.rs
@@ -651,26 +651,30 @@ impl Layout for TreeList {
     /// Keep the field widgets registered/linked under the adapter every tick (the legacy
     /// `set_parent` side effect; also heals the inline rename editor's registry entry).
     fn register_embedded_children(&mut self, host_id: WidgetId, ctx: &mut UiContext) {
+        // Registered but deliberately NOT tree-linked (6bd): the tree is a SELF-ROUTING
+        // composite — mouse_body/move_body/key_body forward to every field widget
+        // internally, so the router's children-first descent double-delivered AND starved
+        // the tree-level logic (the recorded 6as latents: the hit add-key button consumed
+        // the press before mouse_body's take_click toggle ran, so the popover never
+        // opened, and the wheel died the same way). Registration alone keeps the ids
+        // resolvable for focus, coverage, and the spatial grid.
+        let _ = host_id;
         let sb_ptr = self.search_box.as_ptr_mut();
         let sb_id = self.search_box.base().id();
         ctx.register_widget(sb_id, sb_ptr);
-        ctx.link_ids(host_id, sb_id);
 
         let btn_ptr = self.add_key_btn.as_ptr_mut();
         let btn_id = self.add_key_btn.base().id();
         ctx.register_widget(btn_id, btn_ptr);
-        ctx.link_ids(host_id, btn_id);
 
         let pop_ptr = self.add_key_popover_box.as_ptr_mut();
         let pop_id = self.add_key_popover_box.base().id();
         ctx.register_widget(pop_id, pop_ptr);
-        ctx.link_ids(host_id, pop_id);
 
         if self.editing_key_idx.is_some() {
             let eb_ptr = self.edit_box.as_ptr_mut();
             let eb_id = self.edit_box.base().id();
             ctx.register_widget(eb_id, eb_ptr);
-            ctx.link_ids(host_id, eb_id);
         }
     }
 }
@@ -684,8 +688,9 @@ impl Paint for TreeList {
         Some(crate::layout::tree_font())
     }
 
-    // The field widgets stay ctx-linked (event propagation descends them), but their
-    // pixels come from `paint`'s child pass — the walk must not also descend.
+    // The field widgets are registered but not tree-linked (self-routing, see
+    // register_embedded_children); their pixels come from `paint`'s child pass — the
+    // walk must not descend either.
     fn paints_own_subtree(&self) -> bool {
         true
     }