修复快捷咨询串入人工会话及上下文切换

static/css/chat.css

@@ -87,6 +87,8 @@ body { padding: 20px; height: 100dvh; overflow: hidden; }
 .recent-date { white-space: nowrap; color: var(--muted); font-size: 10px; }
 .composer { flex-shrink: 0; align-self: center; width: min(820px, calc(100% - 76px)); padding: 12px 0 15px; background: var(--surface); }
 .hot-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; margin-bottom: 10px; }
+.human-session { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 12px; margin-bottom: 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--brand-soft); color: var(--secondary); font-size: 12px; }
+.human-session button { flex-shrink: 0; padding: 6px 9px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface); color: var(--brand-text); font-size: 12px; }
 .hot-bar-label { font-size: 10px; color: var(--muted); margin-right: 3px; }
 .hot-bar .hot-capsule { border: 0; padding: 4px 8px; background: var(--surface-soft); font-size: 10px; }
 .input-area { display: flex; align-items: flex-end; gap: 10px; border: 1px solid var(--border); border-radius: 12px; padding: 9px; background: var(--surface); box-shadow: 0 3px 15px rgba(28, 47, 80, .035); }