feat: interaction upgrades — feedback buttons, export, shortcuts, input unlock

- Add ThumbsUp/ThumbsDown feedback buttons on AI messages (hover reveal)
- Add ExportButton to export conversation as Markdown file
- Add global keyboard shortcuts: Ctrl+Shift+O (new thread), Ctrl+Shift+S (sidebar), / (focus input), Esc (stop)
- Unlock textarea during AI generation (remove disabled={thread.isLoading})
- Smart title truncation at word/punctuation boundary (30 chars)
- Show tool inputSummary in ToolCallStatus execution log

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

langgraph/src/components/ToolCallStatus.tsx

@@ -232,6 +232,11 @@ function ToolCallRow({
               原因：<span className="text-red-600">{logEntry.errorMessage}</span>
             </span>
           )}
+          {(logEntry as any).inputSummary && (
+            <span className="text-xs text-muted-foreground w-full">
+              查询：<span className="text-foreground font-medium">{(logEntry as any).inputSummary}</span>
+            </span>
+          )}
         </div>
       )}
       {expanded && !isFailed && uiItem && stream && components && (

langgraph/src/main.tsx

@@ -9,7 +9,7 @@ type UIMsgLocal = { id: string; type: string; name: string; props: Record<string
 import { useState, useRef, useEffect, useCallback, Component, type ReactNode } from "react";
 import ComponentMap from "./agent-uis/index.tsx";
 import "./index.css";
-import { BookOpen, Search, Terminal, Ticket, Zap, Cpu, Bot, Menu, Copy, Check, RefreshCw, Square, Pencil, ChevronDown, Sparkles, Loader2, AlertTriangle, Plus } from "lucide-react";
+import { BookOpen, Search, Terminal, Ticket, Zap, Cpu, Bot, Menu, Copy, Check, RefreshCw, Square, Pencil, ChevronDown, Sparkles, Loader2, AlertTriangle, Plus, ThumbsUp, ThumbsDown, Download } from "lucide-react";
 import { cn } from "@/lib/utils";
 import { ThreadSidebar, type ThreadItem, updateThreadLastActive } from "@/components/ThreadSidebar.tsx";
 import { ThemeProvider } from "next-themes";
@@ -138,6 +138,84 @@ function CopyButton({ text }: { text: string }) {
   );
 }
 
+// ─── Feedback buttons (thumbs up/down) for AI messages ─────────────────────
+function FeedbackButtons({ messageId }: { messageId: string }) {
+  const [feedback, setFeedback] = useState<"up" | "down" | null>(null);
+  const handleFeedback = (type: "up" | "down") => {
+    setFeedback((prev) => (prev === type ? null : type));
+  };
+  return (
+    <>
+      <button
+        type="button"
+        onClick={() => handleFeedback("up")}
+        className={cn(
+          "inline-flex items-center text-xs px-1.5 py-0.5 rounded transition-colors",
+          feedback === "up"
+            ? "text-green-600 bg-green-100 dark:bg-green-900/30"
+            : "opacity-0 group-hover:opacity-100 text-muted-foreground hover:text-foreground hover:bg-accent",
+        )}
+        title="有帮助"
+      >
+        <ThumbsUp className="size-3.5" />
+      </button>
+      <button
+        type="button"
+        onClick={() => handleFeedback("down")}
+        className={cn(
+          "inline-flex items-center text-xs px-1.5 py-0.5 rounded transition-colors",
+          feedback === "down"
+            ? "text-red-600 bg-red-100 dark:bg-red-900/30"
+            : "opacity-0 group-hover:opacity-100 text-muted-foreground hover:text-foreground hover:bg-accent",
+        )}
+        title="无帮助"
+      >
+        <ThumbsDown className="size-3.5" />
+      </button>
+    </>
+  );
+}
+
+// ─── Export conversation as Markdown ────────────────────────────────────────
+function ExportButton({ messages }: { messages: Array<Record<string, unknown>> }) {
+  const handleExport = () => {
+    const lines: string[] = ["# 对话记录\n"];
+    for (const msg of messages) {
+      const isHuman =
+        (msg as any).getType?.() === "human" || (msg as any).type === "human";
+      const raw = (msg as any).content;
+      const text =
+        typeof raw === "string"
+          ? raw
+          : Array.isArray(raw)
+            ? raw
+                .filter((b: any) => b?.type === "text")
+                .map((b: any) => b.text)
+                .join("\n")
+            : "";
+      if (!text.trim()) continue;
+      lines.push(isHuman ? `## 用户\n\n${text}\n` : `## AI\n\n${text}\n`);
+    }
+    const blob = new Blob([lines.join("\n")], { type: "text/markdown" });
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement("a");
+    a.href = url;
+    a.download = `对话记录_${new Date().toISOString().slice(0, 10)}.md`;
+    a.click();
+    URL.revokeObjectURL(url);
+  };
+  return (
+    <button
+      type="button"
+      onClick={handleExport}
+      className="inline-flex items-center gap-1 text-xs text-muted-foreground hover:text-foreground px-2 py-1 rounded hover:bg-accent transition-colors"
+      title="导出对话"
+    >
+      <Download className="size-3.5" />
+    </button>
+  );
+}
+
 function App() {
   const [input, setInput] = useState("");
   const bottomRef = useRef<HTMLDivElement>(null);
@@ -285,6 +363,32 @@ function App() {
     };
   }, [configOpen]);
 
+  // ─── Global keyboard shortcuts ──────────────────────────────────────────
+  useEffect(() => {
+    function handleGlobalKey(e: KeyboardEvent) {
+      const t = e.target as HTMLElement;
+      const isInput = t.tagName === "TEXTAREA" || t.tagName === "INPUT" || t.isContentEditable;
+      // Ctrl/Cmd + Shift + O → new thread
+      if ((e.ctrlKey || e.metaKey) && e.shiftKey && (e.key === "O" || e.key === "o")) {
+        e.preventDefault(); handleNewThread(); return;
+      }
+      // Ctrl/Cmd + Shift + S → toggle sidebar
+      if ((e.ctrlKey || e.metaKey) && e.shiftKey && (e.key === "S" || e.key === "s")) {
+        e.preventDefault(); setSidebarOpen((v) => !v); return;
+      }
+      // "/" when not in input → focus textarea
+      if (e.key === "/" && !isInput) {
+        e.preventDefault(); textareaRef.current?.focus(); return;
+      }
+      // Escape while loading → stop generation
+      if (e.key === "Escape" && thread.isLoading) {
+        e.preventDefault(); thread.stop(); return;
+      }
+    }
+    document.addEventListener("keydown", handleGlobalKey);
+    return () => document.removeEventListener("keydown", handleGlobalKey);
+  }, [thread.isLoading]); // eslint-disable-line react-hooks/exhaustive-deps
+
   // Load threads on mount
   useEffect(() => {
     client.threads
@@ -484,7 +588,10 @@ function App() {
     );
 
     if (isFirstMessage && currentThreadId) {
-      const titleText = text.slice(0, 20);
+      // Smart title: truncate at word/punctuation boundary instead of mid-word
+      const rawTitle = text.slice(0, 30);
+      const boundaryMatch = rawTitle.match(/^(.{10,}?)[，。！？、；：\s,.!?;:]/);
+      const titleText = boundaryMatch ? boundaryMatch[1] : rawTitle.replace(/\s+\S*$/, "") || rawTitle;
       client.threads.update(currentThreadId, { metadata: { title: titleText } }).catch(() => {});
       try { localStorage.setItem(`title_${currentThreadId}`, titleText); } catch { /* ignore */ }
       setThreads((prev) =>
@@ -956,9 +1063,10 @@ function App() {
                       {thread.isLoading && isLastAi && (
                         <span className="typing-cursor" aria-hidden="true" />
                       )}
-                      {/* Copy button */}
+                      {/* Action buttons: copy + feedback */}
-                      <div className="flex justify-end mt-1">
+                      <div className="flex justify-end mt-1 gap-1">
                         <CopyButton text={plainTextContent} />
+                        <FeedbackButtons messageId={message.id ?? `msg-${idx}`} />
                       </div>
                     </div>
                   )}
@@ -1157,7 +1265,9 @@ function App() {
                 : `${modelLabel} · ${activeToolLabels.length} 个工具`;
           return (
             <div className="shrink-0 border-t border-border px-4 pt-2 pb-0 max-w-3xl mx-auto w-full">
-              <div ref={configPanelRef} className="relative">
+              <div ref={configPanelRef} className="relative flex items-center gap-2">
+                {/* Export button */}
+                <ExportButton messages={activeMessages} />
                 {/* Summary bar */}
                 <button
                   type="button"
@@ -1304,7 +1414,7 @@ function App() {
                 placeholder="输入消息…"
                 value={input}
                 rows={1}
-                disabled={thread.isLoading}
+                disabled={false}
                 onChange={(e) => setInput(e.target.value)}
                 onCompositionStart={() => { isComposingRef.current = true; }}
                 onCompositionEnd={() => { isComposingRef.current = false; }}