feat(desktop): 工业化升级 B —— 真桌面集成（Wails Go 桥 + 原生能力）

让它真正像桌面 App 而非套壳网页：启用闲置的 Wails Go 桥，接原生文件框/系统打开/
通知/无边框标题栏，且全部对浏览器预览（make web）优雅降级。

- app.go：SaveReportAs（原生"另存为"框 + 下载落盘）、OpenReport（下到临时目录 +
  系统默认应用打开 docx）、Notify（macOS osascript 通知）、download/openInSystem 跨平台
- main.go：macOS TitleBarHiddenInset —— 隐藏标题栏、内容铺满到顶、保留红绿灯交通灯
- lib/desktop.ts：window.go.main.App 运行时桥 + isDesktop/isMacDesktop 探测；
  saveReportAs/openReport/notify 在无 Wails（浏览器）时分别降级为 <a download>/新标签/Toast
- ReportView：桌面端「另存为 Word」(原生框) +「用系统打开」+ 完成弹系统通知；
  浏览器端保持「下载 Word」
- KbView：拖拽文件入库（HTML5 dataTransfer，两种模式通用）+ 拖拽高亮 +「选择文件」按钮
- TopBar：顶栏设为 Wails 可拖拽区（--wails-draggable），控件标 no-drag；
  macOS 桌面端左留白让位交通灯

验证：GOWORK=off wails build 打出 .app（绑定生成 + mac 标题栏）；启动真实原生窗口
截图确认无边框标题栏 + 交通灯内嵌 + 顶栏可拖拽（见会话截图）；浏览器(Preview)确认
window.go 不存在时降级正确（下载链路 + 拖拽占位）。tsc + vite build 通过。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sundynix-desktop/frontend/src/views/KbView.tsx

@@ -32,6 +32,7 @@ export function KbView() {
   const [hits, setHits] = useState<KbHit[] | null>(null);
   const [searching, setSearching] = useState(false);
   const [graph, setGraph] = useState<Triple[] | null>(null);
+  const [dragOver, setDragOver] = useState(false);
 
   const onGraph = async () => {
     try {
@@ -118,7 +119,27 @@ export function KbView() {
         {/* 左：入库 + 实时监控 */}
         <section className="flex w-1/2 flex-col border-r border-line p-4">
           <h3 className="mb-2 text-xs font-semibold text-slate-400">入库</h3>
-          <Textarea className="h-24 resize-none" value={text} onChange={(e) => setText(e.target.value)} placeholder="每行一条知识，或上传文件" />
+          <div
+            onDragOver={(e) => {
+              e.preventDefault();
+              setDragOver(true);
+            }}
+            onDragLeave={() => setDragOver(false)}
+            onDrop={(e) => {
+              e.preventDefault();
+              setDragOver(false);
+              const f = e.dataTransfer.files?.[0];
+              if (f) onFile(f);
+            }}
+            className={cn("relative rounded-md", dragOver && "ring-2 ring-brand")}
+          >
+            <Textarea className="h-24 w-full resize-none" value={text} onChange={(e) => setText(e.target.value)} placeholder="每行一条知识，或把文件拖到这里 / 点选择文件" />
+            {dragOver && (
+              <div className="pointer-events-none absolute inset-0 flex items-center justify-center rounded-md bg-ink-950/85 text-xs font-medium text-brand-400">
+                松手以入库该文件
+              </div>
+            )}
+          </div>
           <div className="mt-2 flex items-center gap-2">
             <Button variant="primary" size="sm" icon={Upload} onClick={onIngest} disabled={ingesting || !text.trim()}>
               {ingesting ? "入库中…" : "入库文本"}

sundynix-desktop/frontend/src/views/ReportView.tsx

@@ -1,9 +1,16 @@
 import { useRef, useState } from "react";
-import { Play, Download, FileText } from "lucide-react";
+import { Play, Download, FileText, ExternalLink } from "lucide-react";
 import { generateReport, streamTokens, streamExec, reportDownloadUrl, type Identity, type ExecEvent } from "../lib/api";
+import { isDesktop, saveReportAs, openReport, notify } from "../lib/desktop";
 import { ExecTrace } from "../components/ExecTrace";
 import { Button, Input, Field, Panel, Dot, EmptyState, useToast } from "../ui";
 
+// 安全文件名：去掉路径不安全字符，限长。
+function reportFilename(topic: string, id: string): string {
+  const base = topic.replace(/[\\/:*?"<>|]/g, "").trim().slice(0, 40) || id;
+  return `${base}.docx`;
+}
+
 type Phase = "idle" | "running" | "done" | "error";
 
 // 报告生成：输入主题(+可选知识库) → 触发后端专用编排
@@ -43,7 +50,8 @@ export function ReportView({ identity }: { identity: Identity }) {
         (tok) => setOut((o) => o + tok),
         () => {
           setPhase("done");
-          toast.push("success", "报告已生成，可下载 Word");
+          toast.push("success", "报告已生成，可保存 Word");
+          notify("报告已生成", topic.trim());
         },
         () => {
           setPhase("error");
@@ -83,13 +91,26 @@ export function ReportView({ identity }: { identity: Identity }) {
           {running ? "生成中…" : "生成报告"}
         </Button>
         {phase === "done" && taskId ? (
-          <a
-            href={reportDownloadUrl(taskId)}
-            className="inline-flex h-9 items-center gap-1.5 rounded-md border border-brand/60 px-4 text-sm font-medium text-brand-400 transition hover:bg-brand/10"
-          >
-            <Download className="h-4 w-4" />
-            下载 Word
-          </a>
+          <div className="flex items-center gap-2">
+            <Button
+              icon={Download}
+              onClick={async () => {
+                const p = await saveReportAs(reportDownloadUrl(taskId), reportFilename(topic, taskId));
+                if (p) toast.push("success", "已保存到 " + p);
+              }}
+            >
+              {isDesktop() ? "另存为 Word" : "下载 Word"}
+            </Button>
+            {isDesktop() && (
+              <Button
+                variant="ghost"
+                icon={ExternalLink}
+                onClick={() => openReport(reportDownloadUrl(taskId), reportFilename(topic, taskId)).catch((e) => toast.push("error", String(e)))}
+              >
+                用系统打开
+              </Button>
+            )}
+          </div>
         ) : (
           <span className="h-9" />
         )}