feat(web): add spaces, grouped channels and file chat

web/src/features/channel/Notepad.tsx

@@ -5,7 +5,7 @@ import styles from './Notepad.module.css';
 
 const SAVE_DELAY_MS = 400;
 
-/** 共享便签:频道唯一的快照槽,最后写入者胜(protocol §9)。默认折叠,不占首屏 */
+/** 共享便签:空间唯一的快照槽,最后写入者胜(protocol §9)。默认折叠,不占首屏 */
 export function Notepad({ defaultOpen = false }: { defaultOpen?: boolean }) {
   const snapshot = useWorkspace((s) => s.snapshot);
   const setSnapshot = useWorkspace((s) => s.setSnapshot);