Stage 2 завершён: problem-first ответы и follow-up continuity - ассистент переведён от entity-heavy логики к problem-first ответам с problem-unit слоем, удержанием контекста в follow-up и очисткой пользовательского ответа от сырых технических ссылок.

llm_normalizer/frontend/src/components/AssistantPanel.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useRef } from "react";
+import { useEffect, useRef, useState } from "react";
 import type { AssistantConversationItem } from "../state/types";
 import { JsonView } from "./JsonView";
 import { PanelFrame } from "./PanelFrame";
@@ -33,6 +33,77 @@ function shortTime(iso: string): string {
   return date.toLocaleTimeString("ru-RU");
 }
 
+function stringifyDebug(value: unknown): string {
+  try {
+    return JSON.stringify(value, null, 2);
+  } catch {
+    return String(value);
+  }
+}
+
+function buildConversationExport(sessionId: string, conversation: AssistantConversationItem[]): string {
+  const lines: string[] = [];
+  lines.push("# Assistant conversation export");
+  lines.push(`session_id: ${sessionId || "n/a"}`);
+  lines.push(`exported_at: ${new Date().toISOString()}`);
+  lines.push("");
+
+  for (let index = 0; index < conversation.length; index += 1) {
+    const item = conversation[index];
+    lines.push(`## ${index + 1}. ${item.role}`);
+    lines.push(`message_id: ${item.message_id}`);
+    lines.push(`created_at: ${item.created_at}`);
+    lines.push(`reply_type: ${item.reply_type ?? "n/a"}`);
+    if (item.trace_id) {
+      lines.push(`trace_id: ${item.trace_id}`);
+    }
+    lines.push("");
+    lines.push(item.text || "(empty)");
+    lines.push("");
+
+    if (item.role === "assistant" && item.debug) {
+      lines.push("### technical_breakdown_json");
+      lines.push("```json");
+      lines.push(stringifyDebug(item.debug));
+      lines.push("```");
+      lines.push("");
+    }
+  }
+
+  return lines.join("\n");
+}
+
+async function copyTextToClipboard(text: string): Promise<boolean> {
+  if (navigator.clipboard && window.isSecureContext) {
+    try {
+      await navigator.clipboard.writeText(text);
+      return true;
+    } catch {
+      // Fall back to legacy path below.
+    }
+  }
+
+  const textarea = document.createElement("textarea");
+  textarea.value = text;
+  textarea.setAttribute("readonly", "true");
+  textarea.style.position = "fixed";
+  textarea.style.opacity = "0";
+  textarea.style.pointerEvents = "none";
+  document.body.appendChild(textarea);
+  textarea.select();
+
+  let copied = false;
+  try {
+    copied = document.execCommand("copy");
+  } catch {
+    copied = false;
+  } finally {
+    document.body.removeChild(textarea);
+  }
+
+  return copied;
+}
+
 export function AssistantPanel({
   sessionId,
   conversation,
@@ -51,6 +122,8 @@ export function AssistantPanel({
   errorMessage
 }: AssistantPanelProps) {
   const listRef = useRef<HTMLDivElement | null>(null);
+  const copyResetTimerRef = useRef<number | null>(null);
+  const [copyState, setCopyState] = useState<"idle" | "success" | "error">("idle");
 
   useEffect(() => {
     if (listRef.current) {
@@ -58,11 +131,51 @@ export function AssistantPanel({
     }
   }, [conversation, statusText]);
 
+  useEffect(() => {
+    return () => {
+      if (copyResetTimerRef.current !== null) {
+        window.clearTimeout(copyResetTimerRef.current);
+      }
+    };
+  }, []);
+
+  async function handleCopyConversation(): Promise<void> {
+    if (conversation.length === 0) {
+      return;
+    }
+    const exportText = buildConversationExport(sessionId, conversation);
+    const copied = await copyTextToClipboard(exportText);
+    setCopyState(copied ? "success" : "error");
+
+    if (copyResetTimerRef.current !== null) {
+      window.clearTimeout(copyResetTimerRef.current);
+    }
+    copyResetTimerRef.current = window.setTimeout(() => {
+      setCopyState("idle");
+    }, 2200);
+  }
+
   return (
     <PanelFrame
       title="Режим ассистента"
       subtitle="Диалоговый слой поверх normalizer, маршрутизации и factual retrieval."
-      actions={<span className="status-chip">{sessionId ? `session: ${sessionId}` : "новая сессия"}</span>}
+      actions={
+        <div className="assistant-panel-actions">
+          <button
+            type="button"
+            className="assistant-copy-btn"
+            onClick={() => {
+              void handleCopyConversation();
+            }}
+            disabled={conversation.length === 0}
+          >
+            Скопировать чат
+          </button>
+          {copyState === "success" ? <span className="assistant-copy-feedback success">Скопировано</span> : null}
+          {copyState === "error" ? <span className="assistant-copy-feedback error">Ошибка копирования</span> : null}
+          <span className="status-chip">{sessionId ? `session: ${sessionId}` : "новая сессия"}</span>
+        </div>
+      }
     >
       <div ref={listRef} className="assistant-chat-list">
         {conversation.length === 0 ? (