feat(首页): 登录后不再弹「登录速报」，上次来做了什么、哪道还没做对放进首页，带「接着做」

- 新接口 /me/last-visit：上次登录到这次登录之间的题库提交，不调 AI（原来要同步等模型最长 60 秒弹框才出来）
- 班里今天在做时让位给班里卡，只在卡底留一句；班里那天就是上次来那天时两张卡合成一张
- 第一次登录说「欢迎来到判题狗」，隔了 30 天以上说「好久不见」
- 删掉弹框、store 和 /ai/login-summary

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/oj/home/dashboard.vue

@@ -6,6 +6,7 @@ import {
   getClassActivity,
   getKnowledgeMap,
   getContestList,
+  getLastVisit,
   getLearnProgress,
   getSubmissions,
   getTutorials,
@@ -16,13 +17,14 @@ import { useBreakpoints } from "shared/composables/breakpoints"
 import { useProblemJump } from "shared/composables/problemJump"
 import { pickHeadline, type Headline } from "oj/user/knowledge"
 import { useUserStore } from "shared/store/user"
-import { ContestStatus, CONTEST_STATUS } from "utils/constants"
-import { duration, parseTime, zonedParts } from "utils/functions"
+import { ContestStatus, CONTEST_STATUS, JUDGE_STATUS } from "utils/constants"
+import { duration, parseTime, zonedParts, zonedYear } from "utils/functions"
 import type {
   AnnouncementListItem,
   ClassActivity,
   ClassActivityProblem,
   Contest,
+  LastVisit,
   SubmissionListItem,
   WeeklyRank,
 } from "utils/types"
@@ -51,12 +53,43 @@ const submissions = ref<SubmissionListItem[]>([])
 const announcements = ref<AnnouncementListItem[]>([])
 const weekly = ref<WeeklyRank | null>(null)
 const classActivity = ref<ClassActivity | null>(null)
+const lastVisit = ref<LastVisit | null>(null)
 /** 知识点地图挑出来的那一句（本周升级 / 再做几道升档 / 去点亮一个），见 oj/user/knowledge.ts */
 const knowledgeHeadline = ref<Headline | null>(null)
 const loaded = ref(false)
 const keyword = ref("")
 
+/** 头一回登录、还没交过：问候换成「欢迎」，告诉他题在哪找 */
+const firstVisit = computed(
+  () =>
+    !!lastVisit.value &&
+    !lastVisit.value.previousLogin &&
+    (userStore.profile?.submissionNumber ?? 0) === 0,
+)
+
+/** 离上次来多少天。超过 30 天后端不给「上次来」卡，这里只在问候里说一句 */
+const awayDays = computed(() => {
+  const previous = lastVisit.value?.previousLogin
+  if (!previous) return 0
+  return Math.floor((Date.now() - new Date(previous).getTime()) / 864e5)
+})
+const longAway = computed(() => awayDays.value > 30)
+
+const awayText = computed(() => {
+  const previous = lastVisit.value?.previousLogin
+  if (!previous) return ""
+  const days = awayDays.value
+  const gap =
+    days >= 365
+      ? `隔了 ${Math.floor(days / 365)} 年多`
+      : days >= 60
+        ? `隔了 ${Math.floor(days / 30)} 个月`
+        : `隔了 ${days} 天`
+  return `上次来是 ${dateText(previous)}，${gap}`
+})
+
 const greeting = computed(() => {
+  if (longAway.value) return "好久不见"
   const hour = zonedParts(new Date())!.hour
   if (hour < 5) return "夜深了"
   if (hour < 11) return "早上好"
@@ -133,15 +166,69 @@ async function loadClassActivity() {
   classActivity.value = await getClassActivity()
 }
 
+async function loadLastVisit() {
+  lastVisit.value = await getLastVisit()
+}
+
+/** 东八区的 YYYY-MM-DD，和后端 class-activity 的 day 同一个写法 */
+function dayKey(value: Date | string) {
+  const p = zonedParts(value)!
+  return `${p.year}-${String(p.month).padStart(2, "0")}-${String(p.day).padStart(2, "0")}`
+}
+
+function dateText(value: string) {
+  return parseTime(value, zonedParts(value)!.year === zonedYear() ? "M月D日" : "YYYY年M月D日")
+}
+
+const WEEKDAYS = ["周日", "周一", "周二", "周三", "周四", "周五", "周六"]
+
+/** 「9月27日 周日上午」：机房一个班一周来一两次，说星期几和上下午比说几点几分好认 */
+function visitText(value: string) {
+  const p = zonedParts(value)!
+  const weekday = WEEKDAYS[new Date(Date.UTC(p.year, p.month - 1, p.day)).getUTCDay()]
+  const part = p.hour < 12 ? "上午" : p.hour < 18 ? "下午" : "晚上"
+  return `${dateText(value)} ${weekday}${part}`
+}
+
+/** 班里的题是今天的（老师布置的就是今天）：今天的课排最前，「上次来」只剩卡底一句 */
+const classToday = computed(
+  () =>
+    classActivity.value?.source === "teacher" || classActivity.value?.day === dayKey(new Date()),
+)
+
+const visit = computed(() => lastVisit.value?.summary ?? null)
+
+/**
+ * 班里那天就是上次来的那天：机房一个班一周来一次，上次来做的往往就是班里那节课的题，
+ * 「上次来」卡已经讲了，班里卡不再把同一批题列一遍，只在卡底说一句
+ */
+const visitCoversClass = computed(
+  () =>
+    !!visit.value &&
+    !!classActivity.value?.problems.length &&
+    !classToday.value &&
+    classActivity.value.day === dayKey(visit.value.lastSubmitTime),
+)
+
+const classSummaryText = computed(() => {
+  const problems = classActivity.value?.problems ?? []
+  const done = problems.filter((item) => item.myStatus === "accepted").length
+  return done === problems.length
+    ? `那天班里一起做的 ${problems.length} 道，你都做对了`
+    : `那天班里一起做了 ${problems.length} 道，你做对了 ${done} 道`
+})
+
+const solvedText = computed(() =>
+  (visit.value?.solved ?? []).map((item) => `${item.problemDisplayId} ${item.title}`).join("、"),
+)
+
 /** 今天的就叫「今天」，往前找到的那天标出日期 —— 周一早上看到的是上周五的课 */
 const classActivityTitle = computed(() => {
   const day = classActivity.value?.day
   if (!day) return ""
-  const now = zonedParts(new Date())!
-  const today = `${now.year}-${String(now.month).padStart(2, "0")}-${String(now.day).padStart(2, "0")}`
   // 老师在课堂看板布置的，说成「老师布置的」，比「班里在做」更让人知道该做这几道
   if (classActivity.value?.source === "teacher") return "今天老师布置的题"
-  if (day === today) return "今天班里在做"
+  if (classToday.value) return "今天班里在做"
   const [, month, date] = day.split("-").map(Number)
   return `${month}月${date}日班里做了`
 })
@@ -168,6 +255,7 @@ async function load() {
     loadAnnouncements(),
     loadWeekly(),
     loadClassActivity(),
+    loadLastVisit(),
     loadKnowledge(),
   ])
   loaded.value = true
@@ -226,8 +314,11 @@ async function openAnnouncement(item: AnnouncementListItem) {
   <div class="home">
     <section class="hero">
       <div>
-        <h1 class="hello">{{ greeting }}，{{ userStore.user?.username }}</h1>
-        <n-text depth="3">
+        <h1 v-if="firstVisit" class="hello">欢迎来到判题狗，{{ userStore.user?.username }}</h1>
+        <h1 v-else class="hello">{{ greeting }}，{{ userStore.user?.username }}</h1>
+        <n-text v-if="firstVisit" depth="3">老师报了题号，在右边的框里输入就能找到题</n-text>
+        <n-text v-else depth="3">
+          <template v-if="longAway">{{ awayText }} · </template>
           已解决 {{ userStore.profile?.acceptedNumber ?? 0 }} 题 · 共提交
           {{ userStore.profile?.submissionNumber ?? 0 }} 次
           <template v-if="weeklyText">
@@ -256,9 +347,47 @@ async function openAnnouncement(item: AnnouncementListItem) {
 
     <div class="grid">
       <div class="column">
+        <!-- 「上次来」：上次登录到这次登录之间交过题才有。班里今天在做的时候让位给班里卡，
+             只在那张卡底下留一句没做对的 -->
+        <n-card v-if="visit && !classToday" size="small" :bordered="false" class="card">
+          <template #header>上次来 · {{ visitText(lastVisit!.previousLogin!) }}</template>
+          <template #header-extra>
+            <n-text depth="3" class="row-meta">
+              做对 {{ visit.solvedCount }} 道 · 交了 {{ visit.submissionCount }} 次
+            </n-text>
+          </template>
+          <router-link
+            v-for="item in visit.unsolved"
+            :key="item.problemDisplayId"
+            :to="`/problem/${item.problemDisplayId}`"
+            class="unsolved"
+          >
+            <n-tag type="warning" size="small" :bordered="false">未通过</n-tag>
+            <div class="unsolved-main">
+              <span class="row-title">
+                <n-text depth="3">{{ item.problemDisplayId }}</n-text> {{ item.title }}
+              </span>
+              <n-text depth="3" class="row-meta">
+                交了 {{ item.attempts }} 次，最后一次是{{ JUDGE_STATUS[item.lastResult].name }}
+              </n-text>
+            </div>
+            <n-button type="primary" tag="span">接着做</n-button>
+          </router-link>
+          <div v-if="visit.solvedCount" class="row">
+            <n-tag type="success" size="small" :bordered="false">已通过</n-tag>
+            <span class="row-title">{{ visit.solvedCount }} 道：{{ solvedText }}</span>
+            <router-link to="/submission?myself=1" class="more">
+              看这 {{ visit.solvedCount }} 道 ›
+            </router-link>
+          </div>
+          <div v-if="visitCoversClass" class="visit-foot">
+            <Icon icon="ph:check-bold" :width="14" />{{ classSummaryText }}
+          </div>
+        </n-card>
+
         <!-- 只在有的时候出现：没班级、最近一周班里没一起做过题的，这块不占位置 -->
         <n-card
-          v-if="classActivity?.problems.length"
+          v-if="classActivity?.problems.length && !visitCoversClass"
           :title="classActivityTitle"
           size="small"
           :bordered="false"
@@ -282,6 +411,17 @@ async function openAnnouncement(item: AnnouncementListItem) {
               {{ item.acceptedCount }}/{{ item.userCount }} 人通过
             </n-text>
           </router-link>
+          <div v-if="classToday && visit?.unsolved.length" class="visit-foot warn">
+            <span class="dot"></span>
+            <span class="row-title">
+              上次（{{ dateText(lastVisit!.previousLogin!) }}）还有
+              {{ visit.unsolved.length }} 道没过： {{ visit.unsolved[0]!.problemDisplayId }}
+              {{ visit.unsolved[0]!.title }}
+            </span>
+            <router-link :to="`/problem/${visit.unsolved[0]!.problemDisplayId}`" class="go">
+              接着做 ›
+            </router-link>
+          </div>
         </n-card>
 
         <n-card title="继续学习" size="small" :bordered="false" class="card">
@@ -561,6 +701,62 @@ a.row:hover {
   flex-shrink: 0;
 }
 
+/* 「上次来」没做对的那几道：一道一个白底块，「接着做」是这张卡唯一的主按钮 */
+.unsolved {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 10px 12px;
+  margin-bottom: 8px;
+  border-radius: 6px;
+  border: 1px solid rgba(128, 128, 128, 0.18);
+  background-color: var(--n-color, #fff);
+  color: inherit;
+  text-decoration: none;
+}
+
+.unsolved:hover {
+  border-color: rgba(24, 160, 88, 0.5);
+}
+
+.unsolved-main {
+  flex: 1;
+  min-width: 0;
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+}
+
+.visit-foot {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  margin-top: 4px;
+  padding: 10px 4px 2px;
+  border-top: 1px solid rgba(128, 128, 128, 0.12);
+  font-size: 13px;
+  opacity: 0.75;
+}
+
+.visit-foot.warn {
+  opacity: 1;
+}
+
+.visit-foot .dot {
+  flex: none;
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  background-color: #f0a020;
+}
+
+.visit-foot .go {
+  flex: none;
+  color: #18a058;
+  font-weight: 600;
+  text-decoration: none;
+}
+
 .more,
 .plain-link {
   color: inherit;