perf(web): shorten the cold start when opening a saved space

Activate the account with parallel requests, run the full vault sync in the
background, skip the duplicate space list request, and send the rejoin
together with the first screen of data. [CI]

web/src/store/channels.ts

@@ -24,7 +24,7 @@ interface ChannelsState {
 const upsert = (list: ChannelInfo[], c: ChannelInfo) => [c, ...list.filter((x) => x.id !== c.id)];
 let hydration: Promise<void> | undefined;
 
-export const useChannels = create<ChannelsState>()((set) => ({
+export const useChannels = create<ChannelsState>()((set, get) => ({
   list: [],
   hydrated: false,
   pendingLink: null,
@@ -41,6 +41,8 @@ export const useChannels = create<ChannelsState>()((set) => ({
     return c;
   },
   hydrate: () => {
+    // 账号刷新已经列过一次,别再请求一遍
+    if (get().hydrated) return Promise.resolve();
     hydration ??= api.listSaved().then((list) => set({ list, hydrated: true }), () => set({ hydrated: true }));
     return hydration;
   },