diff --git a/web/src/components/MemoEditor/Editor/SlashCommands.tsx b/web/src/components/MemoEditor/Editor/SlashCommands.tsx
index 883225be0..b00bbd008 100644
--- a/web/src/components/MemoEditor/Editor/SlashCommands.tsx
+++ b/web/src/components/MemoEditor/Editor/SlashCommands.tsx
@@ -1,21 +1,26 @@
 import type { SlashCommandsProps } from "../types";
+import type { EditorRefActions } from ".";
 import { SuggestionsPopup } from "./SuggestionsPopup";
 import { useSuggestions } from "./useSuggestions";
 
 const SlashCommands = ({ editorRef, editorActions, commands }: SlashCommandsProps) => {
+  const handleCommandAutocomplete = (cmd: (typeof commands)[0], word: string, index: number, actions: EditorRefActions) => {
+    // Remove trigger char + word, then insert command output
+    actions.removeText(index, word.length);
+    actions.insertText(cmd.run());
+    // Position cursor relative to insertion point, if specified
+    if (cmd.cursorOffset) {
+      actions.setCursorPosition(index + cmd.cursorOffset);
+    }
+  };
+
   const { position, suggestions, selectedIndex, isVisible, handleItemSelect } = useSuggestions({
     editorRef,
     editorActions,
     triggerChar: "/",
     items: commands,
     filterItems: (items, query) => (!query ? items : items.filter((cmd) => cmd.name.toLowerCase().startsWith(query))),
-    onAutocomplete: (cmd, word, index, actions) => {
-      actions.removeText(index, word.length);
-      actions.insertText(cmd.run());
-      if (cmd.cursorOffset) {
-        actions.setCursorPosition(actions.getCursorPosition() + cmd.cursorOffset);
-      }
-    },
+    onAutocomplete: handleCommandAutocomplete,
   });
 
   if (!isVisible || !position) return null;
diff --git a/web/src/components/MemoEditor/Editor/index.tsx b/web/src/components/MemoEditor/Editor/index.tsx
index 2f684c3ed..84ad32c2f 100644
--- a/web/src/components/MemoEditor/Editor/index.tsx
+++ b/web/src/components/MemoEditor/Editor/index.tsx
@@ -98,7 +98,7 @@ const Editor = forwardRef(function Editor(props: EditorProps, ref: React.Forward
 
         editor.value = editor.value.slice(0, start) + editor.value.slice(start + length);
         editor.focus();
-        editor.selectionEnd = start;
+        editor.setSelectionRange(start, start);
         updateContent();
       },
       setContent: (text: string) => {
@@ -116,8 +116,11 @@ const Editor = forwardRef(function Editor(props: EditorProps, ref: React.Forward
         return editor.value.slice(editor.selectionStart, editor.selectionEnd);
       },
       setCursorPosition: (startPos: number, endPos?: number) => {
-        const endPosition = Number.isNaN(endPos) ? startPos : (endPos as number);
-        editorRef.current?.setSelectionRange(startPos, endPosition);
+        const editor = editorRef.current;
+        if (!editor) return;
+        // setSelectionRange requires valid arguments; default to startPos if endPos is undefined
+        const endPosition = endPos !== undefined && !Number.isNaN(endPos) ? endPos : startPos;
+        editor.setSelectionRange(startPos, endPosition);
       },
       getCursorLineNumber: () => {
         const editor = editorRef.current;
diff --git a/web/src/components/MemoEditor/Editor/useSuggestions.ts b/web/src/components/MemoEditor/Editor/useSuggestions.ts
index c11d01ff4..aff69a149 100644
--- a/web/src/components/MemoEditor/Editor/useSuggestions.ts
+++ b/web/src/components/MemoEditor/Editor/useSuggestions.ts
@@ -35,6 +35,7 @@ export function useSuggestions<T>({
 }: UseSuggestionsOptions<T>): UseSuggestionsReturn<T> {
   const [position, setPosition] = useState<Position | null>(null);
   const [selectedIndex, setSelectedIndex] = useState(0);
+  const isProcessingRef = useRef(false);
 
   const selectedRef = useRef(selectedIndex);
   selectedRef.current = selectedIndex;
@@ -66,9 +67,14 @@ export function useSuggestions<T>({
       console.warn("useSuggestions: editorActions not available");
       return;
     }
+    isProcessingRef.current = true;
     const [word, index] = getCurrentWord();
     onAutocomplete(item, word, index, editorActions.current);
     hide();
+    // Re-enable input handling after all DOM operations complete
+    queueMicrotask(() => {
+      isProcessingRef.current = false;
+    });
   };
 
   const handleNavigation = (e: KeyboardEvent, selected: number, suggestionsCount: number) => {
@@ -107,6 +113,8 @@ export function useSuggestions<T>({
   };
 
   const handleInput = () => {
+    if (isProcessingRef.current) return;
+
     const editor = editorRef.current;
     if (!editor) return;
 
diff --git a/web/src/components/MemoView/components/metadata/AttachmentList.tsx b/web/src/components/MemoView/components/metadata/AttachmentList.tsx
index c60db187f..1ea2ecf9b 100644
--- a/web/src/components/MemoView/components/metadata/AttachmentList.tsx
+++ b/web/src/components/MemoView/components/metadata/AttachmentList.tsx
@@ -120,7 +120,7 @@ const AttachmentList = ({ attachments }: AttachmentListProps) => {
         <div className="p-2 flex flex-col gap-1">
           {mediaItems.length > 0 && <MediaGrid attachments={mediaItems} onImageClick={handleImageClick} />}
 
-          {mediaItems.length > 0 && docItems.length > 0 && <div className="border-t border-border opacity-60" />}
+          {mediaItems.length > 0 && docItems.length > 0 && <div className="border-t mt-1 border-border opacity-60" />}
 
           {docItems.length > 0 && <DocsList attachments={docItems} />}
         </div>