refactor: externalize local upload helpers

Add local-upload-runtime.js as a browser runtime module for upload and attachment helper functions, with sidebar fallback wrappers and a fixed runtime asset route.

While validating task479, fix the editor attachment delete path so DOM-selected local attachment links are mapped back to a Tiptap text selection before delete_selection(), preserving undo history and adjacent links.

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

@@ -1,3 +1,4 @@
+use leptos_tiptap::TiptapRange;
 use wasm_bindgen::{JsCast, JsValue};
 use web_sys::{window, Element};
 
@@ -9,20 +10,17 @@ fn editor_root_element() -> Option<Element> {
         .and_then(|document| document.query_selector(EDITOR_ROOT_SELECTOR).ok().flatten())
 }
 
-/// 当前 DOM 选中文本匹配本地附件链接文本时返回 `true`。
-pub(crate) fn selected_local_attachment_link_text() -> bool {
+fn selected_local_attachment_link_dom_info() -> Option<(String, String)> {
     let selection = match window().and_then(|win| win.get_selection().ok().flatten()) {
         Some(selection) if !selection.is_collapsed() => selection,
-        _ => return false,
+        _ => return None,
     };
     let selected_text = String::from(selection.to_string()).trim().to_string();
     if selected_text.is_empty() {
-        return false;
+        return None;
     }
 
-    let Some(root) = editor_root_element() else {
-        return false;
-    };
+    let root = editor_root_element()?;
     let links = root.get_elements_by_tag_name("a");
     for index in 0..links.length() {
         let Some(link) = links.item(index) else {
@@ -33,11 +31,16 @@ pub(crate) fn selected_local_attachment_link_text() -> bool {
             continue;
         }
         if link.text_content().unwrap_or_default().trim() == selected_text {
-            return true;
+            return Some((selected_text, href));
         }
     }
 
-    false
+    None
+}
+
+/// 当前 DOM 选中文本匹配本地附件链接文本时返回 `true`。
+pub(crate) fn selected_local_attachment_link_text() -> bool {
+    selected_local_attachment_link_dom_info().is_some()
 }
 
 /// 当前非空选区命中本地附件链接 mark 时返回 `true`。
@@ -85,3 +88,54 @@ pub(crate) fn selected_local_attachment_link_in_editor_state() -> bool {
 pub(crate) fn is_local_attachment_link_selected() -> bool {
     selected_local_attachment_link_in_editor_state() || selected_local_attachment_link_text()
 }
+
+pub(crate) fn selected_local_attachment_link_range() -> Option<TiptapRange> {
+    let (selected_text, selected_href) = selected_local_attachment_link_dom_info()?;
+    let root = editor_root_element()?;
+    let editor_value = js_sys::Reflect::get(root.as_ref(), &JsValue::from_str("editor")).ok()?;
+    let find_range = js_sys::Function::new_with_args(
+        "editor, selectedText, selectedHref",
+        r#"
+        if (!editor || !editor.state || !editor.state.doc) return null;
+        var text = String(selectedText || '').trim();
+        var hrefNeedle = String(selectedHref || '').trim();
+        if (!text) return null;
+        var match = null;
+        editor.state.doc.descendants(function(node, pos) {
+          if (match || !node || !node.isText) return;
+          var nodeText = String(node.text || '');
+          var offset = nodeText.indexOf(text);
+          if (offset < 0) return;
+          var hasAttachmentLink = Array.isArray(node.marks) && node.marks.some(function(mark) {
+            var href = mark && mark.attrs ? String(mark.attrs.href || '') : '';
+            return mark.type && mark.type.name === 'link'
+              && href.indexOf('/api/local-folder/files/open') >= 0
+              && (!hrefNeedle || href === hrefNeedle);
+          });
+          if (!hasAttachmentLink) return;
+          match = { from: pos + offset, to: pos + offset + text.length };
+        });
+        return match;
+        "#,
+    );
+    let range_value = find_range
+        .call3(
+            &JsValue::NULL,
+            &editor_value,
+            &JsValue::from_str(&selected_text),
+            &JsValue::from_str(&selected_href),
+        )
+        .ok()?;
+    if range_value.is_null() || range_value.is_undefined() {
+        return None;
+    }
+    let from = js_sys::Reflect::get(&range_value, &JsValue::from_str("from"))
+        .ok()
+        .and_then(|value| value.as_f64())
+        .filter(|value| value.is_finite() && *value >= 0.0)? as u32;
+    let to = js_sys::Reflect::get(&range_value, &JsValue::from_str("to"))
+        .ok()
+        .and_then(|value| value.as_f64())
+        .filter(|value| value.is_finite() && *value >= from as f64)? as u32;
+    Some(TiptapRange { from, to })
+}

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

@@ -12,6 +12,9 @@ pub(crate) fn delete_selected_attachment_link_with_history(
     if !attachment_links::is_local_attachment_link_selected() {
         return Err("当前选区不是本地附件链接".to_string());
     }
+    if let Some(range) = attachment_links::selected_local_attachment_link_range() {
+        let _ = editor.set_text_selection(range);
+    }
     // 继续走 Tiptap 命令路径，保留撤销/重做历史。
     editor.delete_selection().map_err(|error| error.to_string())
 }