refactor: extract block dnd element helpers

design/05-editor-mainline/process/5-29-editor-runtime-followup-checklist-v1.md

@@ -212,3 +212,8 @@ UI / 浏览器可见项必须有真实浏览器截图或结构化 smoke 证据
   - 未迁：`hovered_block_from_target`、`drop_indicator_from_target`、`drop_indicator_from_point`、拖拽 listener、block reorder 行为和 DOM -> block 状态解析链仍留在 `lib.rs`。
   - 修改：`rust/spikes/leptos-tiptap-spike/src/editor_runtime/block_dnd.rs`、`rust/spikes/leptos-tiptap-spike/src/lib.rs`。
   - 已验证：`cargo fmt --manifest-path rust/Cargo.toml --all --check`、`cargo check --manifest-path rust/spikes/leptos-tiptap-spike/Cargo.toml`、wasm release build、`wasm-bindgen`、`MNOTE_WEB_SMOKE_BASE_URL=http://127.0.0.1:3001 NODE_PATH=/mnt/Data1T/mnote/node_modules node scripts/task489-block-menu-delete-undo-smoke.js`、`MNOTE_WEB_SMOKE_BASE_URL=http://127.0.0.1:3001 NODE_PATH=/mnt/Data1T/mnote/node_modules node scripts/task488-local-attachment-link-delete-undo-smoke.js`、`MNOTE_WEB_SMOKE_BASE_URL=http://127.0.0.1:3001 NODE_PATH=/mnt/Data1T/mnote/node_modules node scripts/task479-local-folder-markdown-resource-lifecycle-smoke.js`、`git diff --check`、`codegraph sync .`、`codegraph status . --json` pending 0。
+- 2026-05-25：Batch Y 暂停派发新 Reasonix worker，原因是 Batch X 刚出现自动扩散 runner；主控先用 CodeGraph 复核 `target_element`、`direct_block_from_element`、`top_level_block_index`、`hovered_block_from_target`、`drop_indicator_from_target` 调用关系后，本地完成最小机械切片。
+  - Codex 主控把 `direct_block_from_element`、`top_level_block_index` 迁入 `editor_runtime/block_dnd.rs`；`lib.rs` 仅保留 root/stage 查询、`block_state_from_index`、`hovered_block_from_target` / `hovered_block_from_selection` 的壳层状态组装。
+  - 未迁：`target_element` 仍被图片 toolbar 和事件 listener 共用；`hovered_block_from_target`、`drop_indicator_from_target`、`drop_indicator_from_point`、拖拽 listener、block reorder 行为和 DOM -> block 状态解析链仍留在 `lib.rs`。
+  - 修改：`rust/spikes/leptos-tiptap-spike/src/editor_runtime/block_dnd.rs`、`rust/spikes/leptos-tiptap-spike/src/lib.rs`、generated island `js/wasm`。
+  - 已验证：`cargo fmt --manifest-path rust/Cargo.toml --all --check`、`cargo check --manifest-path rust/spikes/leptos-tiptap-spike/Cargo.toml`、wasm release build、`wasm-bindgen`、`MNOTE_WEB_SMOKE_BASE_URL=http://127.0.0.1:3001 NODE_PATH=/mnt/Data1T/mnote/node_modules node scripts/task489-block-menu-delete-undo-smoke.js`、`MNOTE_WEB_SMOKE_BASE_URL=http://127.0.0.1:3001 NODE_PATH=/mnt/Data1T/mnote/node_modules node scripts/task488-local-attachment-link-delete-undo-smoke.js`、`MNOTE_WEB_SMOKE_BASE_URL=http://127.0.0.1:3001 NODE_PATH=/mnt/Data1T/mnote/node_modules node scripts/task479-local-folder-markdown-resource-lifecycle-smoke.js`。

rust/spikes/leptos-tiptap-spike/generated/island/mnote-leptos-tiptap-spike-island.js

@@ -1270,7 +1270,7 @@ function __wbg_get_imports() {
         },
         __wbindgen_cast_0000000000000003: function(arg0, arg1) {
             // Cast intrinsic for `Closure(Closure { owned: true, function: Function { arguments: [Externref], shim_idx: 973, ret: Unit, inner_ret: Some(Unit) }, mutable: false }) -> Externref`.
-            const ret = makeClosure(arg0, arg1, wasm_bindgen__convert__closures_____invoke__had771ddc65647798);
+            const ret = makeClosure(arg0, arg1, wasm_bindgen__convert__closures_____invoke__h19d53c3ed5a90a91);
             return ret;
         },
         __wbindgen_cast_0000000000000004: function(arg0, arg1) {
@@ -1284,8 +1284,8 @@ function __wbg_get_imports() {
             return ret;
         },
         __wbindgen_cast_0000000000000006: function(arg0, arg1) {
-            // Cast intrinsic for `Closure(Closure { owned: true, function: Function { arguments: [NamedExternref("KeyboardEvent")], shim_idx: 886, ret: Unit, inner_ret: Some(Unit) }, mutable: true }) -> Externref`.
+            // Cast intrinsic for `Closure(Closure { owned: true, function: Function { arguments: [NamedExternref("KeyboardEvent")], shim_idx: 799, ret: Unit, inner_ret: Some(Unit) }, mutable: true }) -> Externref`.
-            const ret = makeMutClosure(arg0, arg1, wasm_bindgen__convert__closures_____invoke__hd90af689bc3e71bf);
+            const ret = makeMutClosure(arg0, arg1, wasm_bindgen__convert__closures_____invoke__ha181c94e3b9968a5);
             return ret;
         },
         __wbindgen_cast_0000000000000007: function(arg0, arg1) {
@@ -1359,8 +1359,8 @@ function wasm_bindgen__convert__closures_____invoke__h396914cf76a9e7a5(arg0, arg
     wasm.wasm_bindgen__convert__closures_____invoke__h396914cf76a9e7a5(arg0, arg1, arg2);
 }
 
-function wasm_bindgen__convert__closures_____invoke__had771ddc65647798(arg0, arg1, arg2) {
+function wasm_bindgen__convert__closures_____invoke__h19d53c3ed5a90a91(arg0, arg1, arg2) {
-    wasm.wasm_bindgen__convert__closures_____invoke__had771ddc65647798(arg0, arg1, arg2);
+    wasm.wasm_bindgen__convert__closures_____invoke__h19d53c3ed5a90a91(arg0, arg1, arg2);
 }
 
 function wasm_bindgen__convert__closures_____invoke__h0abd2b2fe4652e2a(arg0, arg1, arg2) {
@@ -1371,8 +1371,8 @@ function wasm_bindgen__convert__closures_____invoke__h396914cf76a9e7a5_4(arg0, a
     wasm.wasm_bindgen__convert__closures_____invoke__h396914cf76a9e7a5_4(arg0, arg1, arg2);
 }
 
-function wasm_bindgen__convert__closures_____invoke__hd90af689bc3e71bf(arg0, arg1, arg2) {
+function wasm_bindgen__convert__closures_____invoke__ha181c94e3b9968a5(arg0, arg1, arg2) {
-    wasm.wasm_bindgen__convert__closures_____invoke__hd90af689bc3e71bf(arg0, arg1, arg2);
+    wasm.wasm_bindgen__convert__closures_____invoke__ha181c94e3b9968a5(arg0, arg1, arg2);
 }
 
 function wasm_bindgen__convert__closures_____invoke__h3a3182d847094e12(arg0, arg1, arg2) {

rust/spikes/leptos-tiptap-spike/src/editor_runtime/block_dnd.rs

@@ -85,6 +85,26 @@ pub(crate) fn element_within_handle_shell(element: &Element, handle_selector: &s
     element.closest(handle_selector).ok().flatten().is_some()
 }
 
+pub(crate) fn direct_block_from_element(mut element: Element, root: &Element) -> Option<Element> {
+    loop {
+        let parent = element.parent_element()?;
+        if parent.is_same_node(Some(root)) {
+            return Some(element);
+        }
+        element = parent;
+    }
+}
+
+pub(crate) fn top_level_block_index(root: &Element, block: &Element) -> Option<usize> {
+    let children = root.children();
+    (0..children.length()).find_map(|index| {
+        children
+            .item(index)
+            .filter(|child| child.is_same_node(Some(block)))
+            .map(|_| index as usize)
+    })
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

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

@@ -22,8 +22,9 @@ use web_sys::{
 
 use editor_runtime::attachment_upload::dispatch_editor_upload_request;
 use editor_runtime::block_dnd::{
-    drop_indicator_from_geometry, element_within_handle_shell, event_target_from_point,
+    direct_block_from_element, drop_indicator_from_geometry, element_within_handle_shell,
-    pointer_in_handle_corridor_geometry, HandleCorridorGeometry,
+    event_target_from_point, pointer_in_handle_corridor_geometry, top_level_block_index,
+    HandleCorridorGeometry,
 };
 use editor_runtime::block_menu_overlay;
 use editor_runtime::block_menu_legacy_html::{
@@ -4837,26 +4838,6 @@ fn handle_lane_left(stage_rect_width: f64) -> f64 {
         .max(HANDLE_STAGE_PADDING_LEFT)
 }
 
-fn direct_block_from_element(mut element: Element, root: &Element) -> Option<Element> {
-    loop {
-        let parent = element.parent_element()?;
-        if parent.is_same_node(Some(root)) {
-            return Some(element);
-        }
-        element = parent;
-    }
-}
-
-fn top_level_block_index(root: &Element, block: &Element) -> Option<usize> {
-    let children = root.children();
-    (0..children.length()).find_map(|index| {
-        children
-            .item(index)
-            .filter(|child| child.is_same_node(Some(block)))
-            .map(|_| index as usize)
-    })
-}
-
 fn block_label_for_element(block: &Element) -> String {
     match block.get_attribute("data-type").as_deref() {
         Some("taskList") => "Todo 列表".to_string(),