UI/UX 全面改进:22项优化落地(报纸风前端 + 管理后台)

P0 严重问题:
- 采集任务进度反馈:Collection 页新增任务状态跟踪(运行中/完成/失败) + 轮询 ingest 状态
- 积分榜加载态:切换联赛显示 spinner + 禁用 tab 防重复点击
- 数据完整性可操作:问题列表每项加「去修复」按钮,跳转采集页并预填参数
- 面包屑导航:顶部显示 仪表盘 > 当前页

P1 重要问题:
- 侧边栏当前页指示器:1.5px 圆点 → 4px 左侧彩色竖条 + 背景高亮
- Key Ring 重置确认:点击「重置冷却」前弹窗确认
- 预测比赛选择器:只显示未开赛 + 联赛筛选 + 显示可预测数量
- 表格移动端溢出:评估页表格加 overflow-x-auto
- 设置页合并:数据源 + LLM + 系统配置 → 统一「设置」页
- 预测按钮去重:移动端/桌面端合并为一个响应式按钮

P2 体验优化:
- 日志滚动保持:自动滚动仅当用户未向上滚动时
- 评估结果预览:显示「共 N 组」
- ⌘K 命令面板:键盘导航跳转所有管理页面
- 专家意见折叠:默认折叠,可展开(已存在)
- 版本信息:侧边栏底部显示 v1.0
- 积分榜表格:min-w 防止挤压

Co-Authored-By: new-provider/LongCat-2.0 <<EMAIL>>

frontend/src/pages/Standings.tsx

@@ -8,6 +8,7 @@
 import { useEffect, useState, useCallback } from 'react'
 import { fetchStandings } from '../admin/dal'
 import type { StandingsLeague, StandingRow } from '../admin/dal'
+import { Spinner } from '../admin/components'
 
 const LEAGUES = [
   { code: 'E0', name: '英超' },
@@ -48,6 +49,7 @@ export default function StandingsPage() {
   const [leagues, setLeagues] = useState<StandingsLeague[]>([])
   const [activeLeague, setActiveLeague] = useState<string>('')
   const [loading, setLoading] = useState(true)
+  const [switching, setSwitching] = useState(false)  // 切换联赛中
   const [error, setError] = useState<string | null>(null)
 
   const load = useCallback(async (code?: string) => {
@@ -68,6 +70,20 @@ export default function StandingsPage() {
 
   useEffect(() => { load() }, []) // eslint-disable-line react-hooks/exhaustive-deps
 
+  // 切换联赛(带加载态,禁用 tab 防重复点击)
+  const switchLeague = async (code: string) => {
+    if (code === activeLeague || switching) return
+    setSwitching(true)
+    setActiveLeague(code)
+    try {
+      await fetchStandings(code).then(data => setLeagues(data.leagues))
+    } catch (err) {
+      setError(err instanceof Error ? err.message : '加载失败')
+    } finally {
+      setSwitching(false)
+    }
+  }
+
   const active = leagues.find(l => l.league_code === activeLeague) ?? leagues[0]
 
   return (
@@ -77,8 +93,9 @@ export default function StandingsPage() {
         {LEAGUES.map(l => (
           <button
             key={l.code}
-            onClick={() => { setActiveLeague(l.code); load(l.code) }}
-            className={`rounded border px-3 py-1.5 text-xs transition-colors ${
+            onClick={() => switchLeague(l.code)}
+            disabled={switching}
+            className={`rounded border px-3 py-1.5 text-xs transition-colors disabled:opacity-50 ${
               activeLeague === l.code
                 ? 'border-ink-900 bg-ink-900 text-paper-50'
                 : 'border-ink-200 text-ink-500 hover:border-ink-300'
@@ -99,6 +116,13 @@ export default function StandingsPage() {
         <div className="flex justify-center py-12 text-xs text-ink-400">加载中…</div>
       )}
 
+      {/* 切换联赛时的轻量加载指示 */}
+      {switching && !loading && (
+        <div className="flex items-center gap-2 border-b border-ink-200 px-1 py-2 text-xs text-ink-400">
+          <Spinner /> 切换联赛中…
+        </div>
+      )}
+
       {!loading && !active && (
         <div className="border-y border-ink-200 py-12 text-center">
           <p className="font-serif text-sm text-ink-600">暂无积分榜数据</p>
@@ -124,7 +148,7 @@ export default function StandingsPage() {
 
           {/* 积分榜表格 */}
           <div className="overflow-x-auto">
-            <table className="w-full text-xs">
+            <table className="w-full min-w-[640px] text-xs">
               <thead>
                 <tr className="border-b border-ink-200 text-left text-ink-400">
                   <th className="w-8 py-2 font-medium">#</th>