fix: trade-pro workspace card description and preview colors (review round)

- design() desc map gains trade-pro entry (was rendering literal 'undefined')
- workspace.css: .theme-preview.trade-pro / .site-icon.trade-pro brand colors

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

app/static/workspace.js

@@ -69,7 +69,7 @@ function content(){if(!currentSite())return noSite();let arr=state.entries.filte
  (arr.length?`<div class="table-wrap"><table class="data-table"><thead><tr><th>名称</th><th>内容类型</th><th>页面地址</th><th>状态</th><th>操作</th></tr></thead><tbody>${arr.slice(0,200).map(e=>`<tr><td><strong>${esc(e.title)}</strong></td><td>${esc(typeName[e.type]||e.type)}</td><td class="muted">${esc(e.route)}</td><td><span class="pill ${e.status==='draft'?'warn':'success'}">${e.status==='draft'?'草稿':'已保存'}</span></td><td class="action-cell"><button class="btn btn-tiny" data-action="edit-entry" data-id="${esc(e.id)}">修改内容</button> <a class="btn btn-tiny" href="/editor/${encodeURIComponent(state.site.id)}/${encodeURIComponent(e.id)}">设计页面 ↗</a></td></tr>`).join('')}</tbody></table></div>`:emptyState('没有找到内容','可以清除筛选条件，或者添加新内容。',actionButton('＋ 添加内容','new-entry')))+
  `${arr.length>200?'<p class="muted">当前显示前 200 条，请使用搜索缩小范围。</p>':''}</div>`;
 }
-function design(){if(!currentSite())return noSite();const s=state.site;const cards=Object.entries(themeName).map(([id,name])=>`<div class="theme-card"><div class="theme-preview ${id}">${name}</div><div class="theme-desc"><h3>${name} ${s.theme===id?'<span class="pill success">当前使用</span>':''}</h3><p>${({automotive:'适合汽车出口、车型及品牌展示',industrial:'适合制造业、产品与技术参数',corporate:'适合集团公司、服务和案例',minimal:'适合作品展示和品牌形象'})[id]}</p><button class="btn btn-tiny ${s.theme===id?'btn-muted':'btn-primary'}" ${s.theme===id?'disabled':''} data-action="set-theme" data-theme="${id}">${s.theme===id?'正在使用':'使用此主题'}</button></div></div>`).join('');
+function design(){if(!currentSite())return noSite();const s=state.site;const cards=Object.entries(themeName).map(([id,name])=>`<div class="theme-card"><div class="theme-preview ${id}">${name}</div><div class="theme-desc"><h3>${name} ${s.theme===id?'<span class="pill success">当前使用</span>':''}</h3><p>${({automotive:'适合汽车出口、车型及品牌展示',industrial:'适合制造业、产品与技术参数',corporate:'适合集团公司、服务和案例',minimal:'适合作品展示和品牌形象','trade-pro':'适合外贸 B2B 英文站点与询盘'})[id]}</p><button class="btn btn-tiny ${s.theme===id?'btn-muted':'btn-primary'}" ${s.theme===id?'disabled':''} data-action="set-theme" data-theme="${id}">${s.theme===id?'正在使用':'使用此主题'}</button></div></div>`).join('');
  return htmlHeading('外观与设计','先选一套网站风格，再打开可视化编辑器修改图文、导航和手机端布局。')+
  `<div class="section-heading"><div><h2>第一步 · 选择行业主题</h2><p>更换主题不会删除您已经录入的业务内容和 URL。</p></div><a href="/theme-gallery" class="btn btn-tiny">查看完整主题预览 ↗</a></div><div class="choice-cards">${cards}</div>`+
  `<div class="section-heading"><div><h2>第二步 · 设计网页</h2><p>挑选要修改的页面；可在设计器中编辑导航、页眉、页脚及各设备布局。</p></div></div><div class="panel"><div class="panel-head"><div><h2>选择要设计的页面</h2><p>修改先保存为草稿，正式发布设计后才会参与下一次静态构建。</p></div></div><div class="grid-2 grid-equal">${state.entries.filter(e=>e.type==='page').slice(0,8).map(e=>`<a class="site-card" href="/editor/${encodeURIComponent(s.id)}/${encodeURIComponent(e.id)}"><span class="site-icon">▤</span><span><h3>${esc(e.title)}</h3><p>${esc(e.route)}</p></span><span class="arrow">›</span></a>`).join('')||'<div class="muted">尚无页面，请先添加内容。</div>'}</div></div><div class="help-hint" style="margin-top:19px"><strong>提示</strong>：网站设置用于公司信息和域名；可视化编辑器用于调整页面外观。两者不会混在同一表单里。</div>`;