refactor: extract dnd target and sidebar helpers

rust/spikes/leptos-tiptap-spike/src/lib.rs

@@ -22,8 +22,8 @@ use web_sys::{
 
 use editor_runtime::attachment_upload::dispatch_editor_upload_request;
 use editor_runtime::block_dnd::{
-    drop_indicator_top, drop_placement_from_block_point, pointer_in_handle_corridor_geometry,
-    HandleCorridorGeometry,
+    drop_indicator_top, drop_placement_from_block_point, event_target_from_point,
+    pointer_in_handle_corridor_geometry, HandleCorridorGeometry,
 };
 use editor_runtime::block_menu_overlay;
 use editor_runtime::block_menu_legacy_html::{
@@ -5430,10 +5430,7 @@ fn drop_indicator_from_target(
 }
 
 fn drop_indicator_from_point(client_x: i32, client_y: i32) -> Option<DropIndicatorState> {
-    let target = window()
-        .and_then(|win| win.document())
-        .and_then(|document| document.element_from_point(client_x as f32, client_y as f32))?;
-    let target: web_sys::EventTarget = target.into();
+    let target = event_target_from_point(client_x, client_y)?;
     drop_indicator_from_target(target, client_y)
 }