refactor: extract editor focus helpers

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

@@ -98,3 +98,7 @@ UI / 浏览器可见项必须有真实浏览器截图或结构化 smoke 证据
   - Codex 已读取 Hindsight recall、`process-handoff.md/json`、`result.json`，并核对 worktree `git status --short` / `git diff --stat` 为空；runner 已产出 completed handoff 但进程未自行退出，主控已终止残留 runner。
   - 审计结论：当前不宜直接把 `sync_editor_overlay_state` / `try_sync_editor_overlay_state` 迁入 `overlays.rs`，因为它们仍强依赖 `HoveredBlockState`、slash/block menu signals、`active_editor_stage` 和 8/18 overlay signal 的局部关闭策略；`on_selection_change` 仍有一套内联 signal 同步逻辑，直接迁出会造成两套 overlay reconciler。
   - 下一刀建议：先做类型/边界准备或更窄 helper，而不是迁整个 sync 函数；候选是抽出 block/overlay shared types（例如 `HoveredBlockState` 及相关 anchor 类型）或把 `active_editor_stage` 的 DOM 判断收口到 runtime helper，之后再考虑 `close_editor_floating_overlays` 整簇迁移。
+- 2026-05-25：Codex 主控完成 editor focus helper 第一刀：新增 `editor_runtime/editor_focus.rs`，迁出 `schedule_editor_focus` 与 `active_editor_stage`；`lib.rs` 仍保留 overlay / block menu signal 编排和调用点。
+  - 修改：`rust/spikes/leptos-tiptap-spike/src/editor_runtime/editor_focus.rs`、`rust/spikes/leptos-tiptap-spike/src/editor_runtime/mod.rs`、`rust/spikes/leptos-tiptap-spike/src/lib.rs`、generated island wasm/js。
+  - 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`、`node scripts/task489-block-menu-delete-undo-smoke.js`、`node scripts/task488-local-attachment-link-delete-undo-smoke.js`。
+  - 未完成：`sync_editor_overlay_state` / `try_sync_editor_overlay_state`、`HoveredBlockState` shared type、block menu signal 仍未拆出。

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

@@ -1284,7 +1284,7 @@ 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: 882, ret: Unit, inner_ret: Some(Unit) }, mutable: true }) -> Externref`.
+            // Cast intrinsic for `Closure(Closure { owned: true, function: Function { arguments: [NamedExternref("KeyboardEvent")], shim_idx: 724, ret: Unit, inner_ret: Some(Unit) }, mutable: true }) -> Externref`.
             const ret = makeMutClosure(arg0, arg1, wasm_bindgen__convert__closures_____invoke__hd90af689bc3e71bf);
             return ret;
         },

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

@@ -0,0 +1,51 @@
+use leptos_tiptap::TiptapEditorHandle;
+use wasm_bindgen::{closure::Closure, JsCast};
+use web_sys::window;
+
+use crate::{
+    editor_root_element, editor_runtime::dom_selection::node_is_within_root, EDITOR_STAGE_SELECTOR,
+};
+
+pub(crate) fn schedule_editor_focus(editor: TiptapEditorHandle) {
+    let Some(win) = window() else {
+        return;
+    };
+    let callback = Closure::<dyn FnMut()>::new(move || {
+        let _ = editor.focus();
+    });
+    let _ = win.set_timeout_with_callback_and_timeout_and_arguments_0(
+        callback.as_ref().unchecked_ref(),
+        0,
+    );
+    callback.forget();
+}
+
+pub(crate) fn active_editor_stage() -> bool {
+    let active_element_inside_stage = window()
+        .and_then(|win| win.document())
+        .and_then(|document| document.active_element())
+        .and_then(|element| element.closest(EDITOR_STAGE_SELECTOR).ok().flatten())
+        .is_some();
+
+    if active_element_inside_stage {
+        return true;
+    }
+
+    let Some(root) = editor_root_element() else {
+        return false;
+    };
+    let Some(selection) = window().and_then(|win| win.get_selection().ok().flatten()) else {
+        return false;
+    };
+
+    let anchor_inside = selection
+        .anchor_node()
+        .map(|node| node_is_within_root(node, &root))
+        .unwrap_or(false);
+    let focus_inside = selection
+        .focus_node()
+        .map(|node| node_is_within_root(node, &root))
+        .unwrap_or(false);
+
+    anchor_inside || focus_inside
+}

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

@@ -4,6 +4,7 @@ pub(crate) mod block_menu_document;
 pub(crate) mod block_menu_legacy_html;
 pub(crate) mod command_sync;
 pub(crate) mod dom_selection;
+pub(crate) mod editor_focus;
 pub(crate) mod history_safe_commands;
 pub(crate) mod overlays;
 pub(crate) mod persistence;

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

@@ -28,8 +28,9 @@ use editor_runtime::command_sync::{
     read_editor_snapshot, sync_editor_outputs, sync_persisted_editor_command,
 };
 use editor_runtime::dom_selection::{
-    has_active_text_selection, node_is_within_root, selection_summary,
+    has_active_text_selection, selection_summary,
 };
+use editor_runtime::editor_focus::{active_editor_stage, schedule_editor_focus};
 use editor_runtime::overlays::{
     floating_toolbar_anchor_from_selection, sync_text_selection_overlay, FloatingToolbarAnchor,
 };
@@ -3655,20 +3656,6 @@ fn schedule_scroll_mnote_block_anchor_from_hash_retry(remaining: u8) {
     callback.forget();
 }
 
-fn schedule_editor_focus(editor: TiptapEditorHandle) {
-    let Some(win) = window() else {
-        return;
-    };
-    let callback = Closure::<dyn FnMut()>::new(move || {
-        let _ = editor.focus();
-    });
-    let _ = win.set_timeout_with_callback_and_timeout_and_arguments_0(
-        callback.as_ref().unchecked_ref(),
-        0,
-    );
-    callback.forget();
-}
-
 fn current_viewport_scroll() -> Option<(f64, f64)> {
     let win = window()?;
     let x = win.scroll_x().ok()?;
@@ -6310,36 +6297,6 @@ fn p0_extensions() -> Vec<TiptapExtension> {
     ]
 }
 
-fn active_editor_stage() -> bool {
-    let active_element_inside_stage = window()
-        .and_then(|win| win.document())
-        .and_then(|document| document.active_element())
-        .and_then(|element| element.closest(EDITOR_STAGE_SELECTOR).ok().flatten())
-        .is_some();
-
-    if active_element_inside_stage {
-        return true;
-    }
-
-    let Some(root) = editor_root_element() else {
-        return false;
-    };
-    let Some(selection) = window().and_then(|win| win.get_selection().ok().flatten()) else {
-        return false;
-    };
-
-    let anchor_inside = selection
-        .anchor_node()
-        .map(|node| node_is_within_root(node, &root))
-        .unwrap_or(false);
-    let focus_inside = selection
-        .focus_node()
-        .map(|node| node_is_within_root(node, &root))
-        .unwrap_or(false);
-
-    anchor_inside || focus_inside
-}
-
 fn current_block_info_from_index(index: Option<usize>) -> CurrentBlockInfo {
     index
         .map(|value| CurrentBlockInfo {