style(比赛/题单/班级PK/统计): 图例和规则说明跟排名页一样多，读起来像说明书

比赛排名表底下的图例和用时规则、比赛题目页的「做对人数随时更新」和计分规则、
老师比赛班级页的「学生看不到这一页 · 15 秒刷新一次」和键盘提示；
题单详情的「加入以后…才算进度」「做对一道会自动回到这里」、题单列表的
「老师现在布置的」「加入过的在前」、老师题单进度表底部的颜色说明；
班级 PK 里「格子里是…」「条 = …」「皇冠 = …」「一根柱一档…」「这学期，最近 N 周」、
只有一个班做过的题那行、「根据上面这些数字写，仅供参考」；
统计里「没选班级，先按班级列出来…」「点方块在新页面打开这一条」；
流程图节点库的「拖拽节点到画布中」，都拿掉。

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

apps/web/src/oj/class/components/PkDuel.vue

@@ -70,19 +70,6 @@ const steadier = computed(() => {
   return `${nameOf(firstLeft > firstRight ? 0 : 1)}更稳`
 })
 
-/** 只有一个班布置过的题：不比，列几道名字 */
-const soloText = computed(() => {
-  const { solo } = props.pk
-  if (!solo.length) return ""
-  const names = solo.slice(0, 2).map((item) => `「${item.title}」`)
-  const owners = new Set(solo.map((item) => item.className))
-  const who =
-    owners.size === 1
-      ? `只有${nameOf(props.pk.classes.findIndex((item) => item.className === solo[0]!.className))}做过的`
-      : "只有一个班做过的"
-  return `${who} ${solo.length} 道不比：${names.join("、")}${solo.length > 2 ? " 等" : ""}`
-})
-
 const SHOW_MOBILE = 7
 const expanded = ref(false)
 const shownRows = computed(() =>
@@ -136,7 +123,7 @@ const tab = ref<"weekly" | "dist">("weekly")
         </span>
       </div>
       <div class="mid">
-        <span class="muted">两个班都做过的 {{ rows.length }} 道题 · 谁做对的人多谁赢这道</span>
+        <span class="muted">{{ rows.length }} 道题</span>
         <span class="big">
           <b :style="{ color: colors[0] }">{{ score.left }}</b>
           <i>:</i>
@@ -154,13 +141,6 @@ const tab = ref<"weekly" | "dist">("weekly")
     <div class="card">
       <div class="card-head">
         <b>同一批题</b>
-        <span class="muted">
-          条 = 全班做对的人占几成<template v-if="!compact">
-            · 皇冠 = 这道赢了 · 按两班差距从大到小</template
-          >
-        </span>
-        <div class="spacer" />
-        <span v-if="soloText && !compact" class="muted">{{ soloText }}</span>
       </div>
 
       <template v-if="!compact">
@@ -288,7 +268,7 @@ const tab = ref<"weekly" | "dist">("weekly")
       </div>
       <div v-if="!compact || tab === 'weekly'" class="card pad">
         <div v-if="!compact" class="card-title">
-          <b>每周人均新做对</b><span class="muted">这学期，最近 {{ weeks.list.length }} 周</span>
+          <b>每周人均新做对</b>
         </div>
         <div class="weeks">
           <div v-for="week in weeks.list" :key="week.label" class="week">
@@ -310,7 +290,7 @@ const tab = ref<"weekly" | "dist">("weekly")
       </div>
       <div v-if="!compact || tab === 'dist'" class="card pad dist">
         <div v-if="!compact" class="card-title">
-          <b>全班分布</b><span class="muted">一根柱一档，横轴是做对几道 · 虚线是中间那位</span>
+          <b>全班分布</b>
         </div>
         <div v-for="(item, index) in [left, right]" :key="item.className" class="dist-one">
           <span class="dist-name" :style="{ color: colors[index] }">
@@ -451,10 +431,6 @@ const tab = ref<"weekly" | "dist">("weekly")
   margin-bottom: 8px;
 }
 
-.spacer {
-  flex-grow: 1;
-}
-
 .row {
   min-height: 52px;
   display: grid;

apps/web/src/oj/class/components/PkGrid.vue

@@ -90,7 +90,6 @@ const expanded = ref(false)
 const shownRows = computed(() =>
   props.compact && !expanded.value ? rows.value.slice(0, SHOW_MOBILE) : rows.value,
 )
-const soloCount = computed(() => props.pk.solo.length)
 
 const tab = ref<"race" | "lead">("race")
 const medal = (index: number) => palette.value.medal[index]
@@ -101,14 +100,9 @@ const medal = (index: number) => palette.value.medal[index]
     <div class="card table">
       <div class="card-title">
         <b>同一批题 · 一格一个班</b>
-        <span class="muted">
-          格子里是全班做对的人占几成，越深越多<template v-if="!compact">
-            · 皇冠 = 这道题做得最好的班（一样多就都算）</template
-          >
-        </span>
       </div>
       <div class="line heads">
-        <span v-if="!compact" class="name muted">至少两个班布置过的 {{ rows.length }} 道</span>
+        <span v-if="!compact" class="name muted">{{ rows.length }} 道</span>
         <span
           v-for="(item, index) in pk.classes"
           :key="item.className"
@@ -173,9 +167,6 @@ const medal = (index: number) => palette.value.medal[index]
       >
         {{ expanded ? "收起" : `再看 ${rows.length - SHOW_MOBILE} 道 ›` }}
       </button>
-      <span v-if="!compact && soloCount" class="muted foot">
-        只有一个班做过的 {{ soloCount }} 道不在格子里 · 鼠标放到格子上看做对几个人、交了几次
-      </span>
     </div>
 
     <div class="side" :class="{ compact }">
@@ -459,10 +450,6 @@ const medal = (index: number) => palette.value.medal[index]
   padding: 0 5px;
 }
 
-.foot {
-  padding-top: 4px;
-}
-
 .side {
   flex: 1;
   min-width: 0;

apps/web/src/oj/class/pk.vue

@@ -289,7 +289,6 @@ async function analyze() {
               <path d="M12 3l1.8 4.7L18.5 9.5l-4.7 1.8L12 16l-1.8-4.7L5.5 9.5l4.7-1.8z" />
             </svg>
             <b>AI 分析</b>
-            <span class="muted">根据上面这些数字写，仅供参考</span>
             <div class="spacer" />
             <n-button size="small" :loading="ai.running.value" @click="analyze">重新分析</n-button>
           </div>