fix: slash menu - stopPropagation on mousedown blocks ProseMirror selectionUpdate

memento-note/components/rich-text-editor.tsx

@@ -483,10 +483,11 @@ function SlashCommandMenu({ editor, onInsertImage }: { editor: Editor; onInsertI
       ref={menuRef}
       className="notion-slash-menu"
       style={{ top: coords.top, left: coords.left }}
-      onMouseDown={() => {
-        // Block selectionUpdate handler while interacting with menu
+      onMouseDown={(e) => {
+        e.preventDefault()      // prevent editor from losing focus
+        e.stopPropagation()     // prevent ProseMirror from seeing the mousedown → no selectionUpdate
         menuInteracting.current = true
-        setTimeout(() => { menuInteracting.current = false }, 200)
+        setTimeout(() => { menuInteracting.current = false }, 300)
       }}
       onClick={(e) => e.stopPropagation()}
     >