feat: enhance conversation export functionality

Author: chenyme

frontend/features/admin/api/settings.ts

@@ -140,6 +140,9 @@ function contentDispositionFileName(value: string | null): string | null {
 
 export async function exportAllConversations(accessToken: string): Promise<AdminConversationExportFile> {
   const response = await authedFetch("/api/v1/admin/conversations/export", { accessToken });
+  if (!response.ok) {
+    throw new Error(`export failed: ${response.status}`);
+  }
   const timestamp = new Date().toISOString().replace(/[:.]/g, "-").slice(0, 19);
   return {
     blob: await response.blob(),

frontend/features/admin/components/sections/conversation/admin-conversation.tsx

@@ -21,6 +21,7 @@ import {
 } from "@/components/ui/dialog";
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
 import { resolveAccessToken } from "@/shared/auth/resolve-access-token";
+import { downloadBlob, readExportManifest } from "@/shared/lib/export-download";
 import {
   SettingsFieldInset,
   SettingsFieldItem,
@@ -387,15 +388,13 @@ export function AdminConversationSettingsPage() {
       const token = await resolveAccessToken();
       if (!token) return;
       const { blob, fileName } = await exportAllConversations(token);
-      const url = URL.createObjectURL(blob);
-      const link = document.createElement("a");
-      link.href = url;
-      link.download = fileName;
-      link.rel = "noopener";
-      document.body.appendChild(link);
-      link.click();
-      link.remove();
-      URL.revokeObjectURL(url);
+      const manifest = await readExportManifest(blob);
+      downloadBlob(blob, fileName);
+      if (manifest && (!manifest.complete || (manifest.failed ?? 0) > 0)) {
+        toast.warning(t("dataExport.partial", { exported: manifest.exported ?? 0, failed: manifest.failed ?? 0 }));
+      } else if (manifest) {
+        toast.success(t("dataExport.success", { count: manifest.exported ?? 0 }));
+      }
     } catch {
       toast.error(t("dataExport.failed"));
     } finally {

frontend/features/recent/components/sections/recent-toolbar.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import * as React from "react";
-import { Archive, Download, Link2Off, Trash, X } from "lucide-react";
+import { Archive, Download, Link2Off, SquareMousePointer, Trash, X } from "lucide-react";
 import { useTranslations } from "next-intl";
 
 import { RecentFilterGroup } from "@/features/recent/components/sections/recent-filter-group";
@@ -179,10 +179,12 @@ export function RecentToolbar({
               <span className="hidden md:inline">{t("allConversationsDescription")}</span>
               <button
                 type="button"
-                className="shrink-0 underline underline-offset-4 transition-colors hover:text-foreground"
+                className="inline-flex size-6 shrink-0 items-center justify-center rounded-md transition-colors hover:bg-accent hover:text-foreground"
                 onClick={onEnterSelectionMode}
+                aria-label={t("enterSelection")}
+                title={t("enterSelection")}
               >
-                {t("select")}
+                <SquareMousePointer className="size-4" strokeWidth={1.4} />
               </button>
               <button
                 type="button"

frontend/features/recent/hooks/use-recent-page.ts

@@ -11,6 +11,7 @@ import { useSidebarRecents } from "@/features/recent/context/sidebar-recents-con
 import { useSettingsChatPreferences } from "@/features/settings/hooks/use-settings-chat-preferences";
 import { resolveAccessToken } from "@/shared/auth/resolve-access-token";
 import { runBulkActionInChunks } from "@/shared/lib/bulk-action";
+import { downloadBlob, readExportManifest } from "@/shared/lib/export-download";
 import {
   exportConversation,
   exportAllConversations,
@@ -318,36 +319,15 @@ export function useRecentPage() {
       const token = await resolveAccessToken();
       if (!token) return;
       const blob = await exportAllConversations(token);
-      const text = await blob.text();
-      const lines = text.trimEnd().split("\n");
-      const lastLine = lines[lines.length - 1];
-      let manifest: { _type?: string; complete?: boolean; exported?: number; failed?: number } | null = null;
-      try {
-        const parsed = JSON.parse(lastLine) as Record<string, unknown>;
-        if (parsed._type === "export_manifest") {
-          manifest = parsed as typeof manifest;
-        }
-      } catch {
-        // not valid JSON — treat as no manifest
-      }
+      const manifest = await readExportManifest(blob);
+      downloadBlob(blob, `my-conversations-${new Date().toISOString().slice(0, 10)}.jsonl`);
 
-      const downloadBlob = new Blob([text], { type: "application/x-ndjson" });
-      const url = URL.createObjectURL(downloadBlob);
-      const link = document.createElement("a");
-      link.href = url;
-      link.download = `my-conversations-${new Date().toISOString().slice(0, 10)}.jsonl`;
-      link.rel = "noopener";
-      document.body.appendChild(link);
-      link.click();
-      link.remove();
-      URL.revokeObjectURL(url);
-
-      if (manifest && !manifest.complete) {
-        toast.warning(t("toast.exportAllPartial", { exported: manifest.exported ?? 0, failed: manifest.failed ?? 0 }));
-      } else if (manifest && (manifest.failed ?? 0) > 0) {
+      if (manifest && (!manifest.complete || (manifest.failed ?? 0) > 0)) {
         toast.warning(t("toast.exportAllPartial", { exported: manifest.exported ?? 0, failed: manifest.failed ?? 0 }));
+      } else if (!manifest) {
+        toast.success(t("toast.exportAllDownloaded"));
       } else {
-        toast.success(t("toast.exportAllSuccess", { count: manifest?.exported ?? lines.length }));
+        toast.success(t("toast.exportAllSuccess", { count: manifest.exported ?? 0 }));
       }
     } catch {
       toast.error(t("toast.exportAllFailed"));

frontend/i18n/messages/en-US/admin-conversation.json

@@ -155,6 +155,8 @@
     "title": "All conversations",
     "description": "Export all conversations, messages, and metadata as a JSONL file.",
     "exportButton": "Export",
+    "success": "Exported {count} conversations",
+    "partial": "Exported {exported} conversations, {failed} failed",
     "failed": "Export failed. Please try again."
   }
 }

frontend/i18n/messages/en-US/recent.json

@@ -73,6 +73,7 @@
   "toast": {
     "exportAllSuccess": "Exported {count} conversations",
     "exportAllPartial": "Exported {exported} conversations, {failed} failed",
+    "exportAllDownloaded": "Conversation export downloaded",
     "exportAllFailed": "Failed to export conversations"
   },
   "conversationCount": "{count}",

frontend/i18n/messages/zh-CN/admin-conversation.json

@@ -155,6 +155,8 @@
     "title": "全部对话",
     "description": "导出所有对话、消息和元数据为 JSONL 文件。",
     "exportButton": "导出",
+    "success": "已导出 {count} 个对话",
+    "partial": "已导出 {exported} 个对话，{failed} 个失败",
     "failed": "导出失败，请重试。"
   }
 }

frontend/i18n/messages/zh-CN/recent.json

@@ -73,6 +73,7 @@
   "toast": {
     "exportAllSuccess": "已导出 {count} 个对话",
     "exportAllPartial": "已导出 {exported} 个对话，{failed} 个失败",
+    "exportAllDownloaded": "对话导出文件已下载",
     "exportAllFailed": "导出对话失败"
   },
   "conversationCount": "{count} 个",

frontend/shared/lib/export-download.ts

@@ -0,0 +1,45 @@
+const EXPORT_MANIFEST_TAIL_BYTES = 1024 * 1024;
+
+export type ExportManifest = {
+  _type?: string;
+  complete?: boolean;
+  exported?: number;
+  failed?: number;
+};
+
+export async function readExportManifest(blob: Blob): Promise<ExportManifest | null> {
+  if (blob.size <= 0) {
+    return null;
+  }
+  const start = Math.max(0, blob.size - EXPORT_MANIFEST_TAIL_BYTES);
+  const tail = await blob.slice(start).text();
+  const lastLine = tail.trimEnd().split(/\r?\n/).at(-1);
+  if (!lastLine) {
+    return null;
+  }
+  try {
+    const parsed = JSON.parse(lastLine) as unknown;
+    if (!parsed || typeof parsed !== "object") {
+      return null;
+    }
+    const manifest = parsed as ExportManifest;
+    return manifest._type === "export_manifest" ? manifest : null;
+  } catch {
+    return null;
+  }
+}
+
+export function downloadBlob(blob: Blob, fileName: string): void {
+  const url = URL.createObjectURL(blob);
+  const link = document.createElement("a");
+  link.href = url;
+  link.download = fileName;
+  link.rel = "noopener";
+  document.body.appendChild(link);
+  try {
+    link.click();
+  } finally {
+    link.remove();
+    window.setTimeout(() => URL.revokeObjectURL(url), 0);
+  }
+}