feat: support shared pet care tasks and smooth daily page return

pets-fe/pages/home/home.js

@@ -6,6 +6,10 @@ function dateLabel() {
   const now = new Date();
   return `${now.getMonth() + 1}月${now.getDate()}日 周${"日一二三四五六"[now.getDay()]}`;
 }
+function accountKey() {
+  const state = getApp().globalData || {};
+  return (state.user && state.user.id) || state.token || "";
+}
 Page({
   data: {
     locationName: "当前位置",
@@ -23,13 +27,32 @@ Page({
     phase: "auth",
     error: "",
   },
+  onLoad() {
+    const cached = getApp().homeSnapshot;
+    if (cached && cached.account === accountKey() && cached.date === localDate()) {
+      this.setData({ ...cached.data, ready: true, phase: "ready", loading: false });
+    }
+  },
   onShow() {
     this.applyEnvironment(environment.cached());
     this.load();
   },
+  onHide() {
+    this.rememberHome();
+  },
   onUnload() {
+    this.rememberHome();
     this.disposed = true;
   },
+  rememberHome() {
+    if (!this.data.ready || !accountKey()) return;
+    const { pets, selected, tasks, undoneCount, walkCount, name } = this.data;
+    getApp().homeSnapshot = {
+      account: accountKey(),
+      date: localDate(),
+      data: { pets, selected, tasks, undoneCount, walkCount, name },
+    };
+  },
   updateEnvironmentLabel() {
     this.setData({
       headerSubtitle:
@@ -112,6 +135,7 @@ Page({
         ready: true,
         phase: "ready",
       });
+      this.rememberHome();
       // Location permission and weather never hold up the first usable screen.
       this.refreshEnvironment();
     } catch (error) {