fix(hub): improve mobile AI coach layout

Move new-chat button to top toolbar to prevent overlap, compact chrome, hide chrome when keyboard opens, and soften mobile tab styling.

Co-authored-by: Cursor <cursoragent@cursor.com>

manual_trading_hub/static/app.js

@@ -3314,8 +3314,16 @@
     const botMode = (session && session.bot_mode) || aiSelectedBotMode || "trading";
     if (title) {
       const modeLabel = botMode === "general" ? "普通聊天" : "交易教练";
-      title.textContent =
-        session && session.title ? `${modeLabel} · ${session.title}` : modeLabel;
+      const sessionTitle = session && session.title ? String(session.title) : "";
+      if (isMobileLayout()) {
+        title.textContent = sessionTitle && sessionTitle !== "新对话"
+          ? sessionTitle
+          : modeLabel;
+      } else {
+        title.textContent = sessionTitle
+          ? `${modeLabel} · ${sessionTitle}`
+          : modeLabel;
+      }
     }
     const showPlaceholder =
       !msgs.length && !options.pendingUser && !options.thinking;