build: 恢复前端类型检查

vue-tsc 不支持 TypeScript 7，前端单独用 TS 5.9 + vue-tsc（服务端仍是 TS 7），
根目录 bun run typecheck 同时检查两边。修掉前端原有的 8 个类型错误（未使用的变量、类型标注）。

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

client/package.json

@@ -7,7 +7,8 @@
     "dev": "bun --bun vite",
     "build": "bun --bun vite build",
     "build:staging": "bun --bun vite build --mode staging",
-    "fmt": "bun fmt src/"
+    "fmt": "bun fmt src/",
+    "typecheck": "vue-tsc --noEmit -p tsconfig.app.json"
   },
   "dependencies": {
     "@codemirror/lang-css": "^6.3.1",
@@ -36,8 +37,9 @@
     "@vitejs/plugin-vue": "^6.0.10",
     "@vue/tsconfig": "^0.9.1",
     "prettier": "^3.9.10",
-    "typescript": "^7.0.2",
+    "typescript": "~5.9.3",
     "unplugin-vue-components": "^32.1.0",
-    "vite": "^8.3.5"
+    "vite": "^8.3.5",
+    "vue-tsc": "^3.3.13"
   }
 }

client/src/components/ai/PromptPanel.vue

@@ -2,7 +2,7 @@
   <div class="prompt-panel">
     <div class="messages" ref="messagesRef">
       <div
-        v-for="(pair, pi) in pairs"
+        v-for="pair in pairs"
         :key="pair.assistantMsg?.id ?? 'user-' + pair.index"
         class="message-pair"
         :class="{ 'has-delete': pair.assistantMsg?.id && !streaming }"

client/src/components/task/TaskStatsModal.vue

@@ -486,21 +486,6 @@ const countBuckets = computed(() => {
   ]
 })
 
-const scoreBars = computed(() => {
-  if (!stats.value) return []
-  const d = stats.value.score_distribution
-  const vals = [d.range_1_2, d.range_2_3, d.range_3_4, d.range_4_5, d.range_5]
-  const max = Math.max(...vals, 1)
-  const colors = ["#d03050", "#f0a020", "#2080f0", "#18a058", "#18a058"]
-  const labels = ["★", "★★", "★★★", "★★★★", "★★★★★"]
-  return vals.map((v, i) => ({
-    value: v,
-    label: labels[i],
-    color: colors[i],
-    height: Math.max(Math.round((v / max) * 68), 3) + "px",
-  }))
-})
-
 const flagBadges = computed(() => {
   if (!stats.value) return []
   const f = stats.value.flag_stats

client/src/pages/Submissions.vue

@@ -115,10 +115,8 @@ import FlagCell from "../components/submissions/FlagCell.vue"
 import ExpandedSubTable from "../components/submissions/ExpandedSubTable.vue"
 
 import { submission } from "../store/submission"
-import { taskTab, challengeDisplay } from "../store/task"
-import { step } from "../store/tutorial"
 import { html as eHtml, css as eCss, js as eJs } from "../store/editors"
-import { roleAdmin, roleSuper, user } from "../store/user"
+import { roleAdmin, roleSuper } from "../store/user"
 
 const route = useRoute()
 const router = useRouter()

client/src/store/submission.ts

@@ -12,6 +12,8 @@ export const submission = ref<SubmissionAll>({
   task_type: TASK_TYPE.Tutorial,
   score: 0.0,
   my_score: 0,
+  submit_count: 0,
+  view_count: 0,
   html: "",
   css: "",
   js: "",