feat(desktop): 底部抽屉可拖拽调高/最大化 + 输出渲染 Markdown

解决两个真实体验问题（编排页底部输出区）：
- 抽屉太矮(176px)长输出放不下：改为可拖拽顶边调高(140px~85vh) + 一键最大化(82vh)/还原。
- 输出原样显示 markdown 未渲染：接入现有轻量 Markdown 组件（标题/加粗/斜/码/列表/引用/分隔/双链，
  随主题），替换 <pre>；含 ```chart 块时文本段渲 Markdown、图表段渲 SVG，保持顺序。
  复用现成组件，未引重依赖（react-markdown 试装后回退），bundle 不涨。

tsc + 生产构建 + vitest 48 全过；桌面端已 HMR。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

sundynix-desktop/frontend/src/shell/BottomDrawer.tsx

@@ -1,8 +1,9 @@
-import { useState } from "react";
+import { useCallback, useRef, useState } from "react";
-import { ChevronDown, ChevronUp, Wrench, ShieldCheck, Check, X } from "lucide-react";
+import { ChevronDown, ChevronUp, Wrench, ShieldCheck, Check, X, Maximize2, Minimize2 } from "lucide-react";
 import { deriveNodes, pendingApproval, type RunState } from "../lib/run";
 import { ExecTrace } from "../components/ExecTrace";
 import { ChartView } from "../components/ChartView";
+import { Markdown } from "../components/Markdown";
 import { extractChartBlocks, hasChart } from "../lib/chartspec";
 import { approveTask } from "../lib/api";
 import { Tabs, Badge, cn, type TabDef } from "../ui";
@@ -13,6 +14,35 @@ type Tab = "output" | "trace" | "tools" | "cite" | "eval";
 export function BottomDrawer({ run }: { run: RunState }) {
   const [open, setOpen] = useState(true);
   const [tab, setTab] = useState<Tab>("output");
+  const [height, setHeight] = useState(240); // 可拖拽调节的抽屉高度
+  const prevH = useRef(240);
+
+  // 拖拽顶边调高：监听 window，高度 = 视口高 - 鼠标 Y，夹在 [140, 85vh]。
+  const startResize = useCallback(() => {
+    const onMove = (e: MouseEvent) => {
+      const h = Math.min(window.innerHeight * 0.85, Math.max(140, window.innerHeight - e.clientY));
+      setOpen(true);
+      setHeight(h);
+    };
+    const onUp = () => {
+      window.removeEventListener("mousemove", onMove);
+      window.removeEventListener("mouseup", onUp);
+      document.body.style.userSelect = "";
+    };
+    document.body.style.userSelect = "none";
+    window.addEventListener("mousemove", onMove);
+    window.addEventListener("mouseup", onUp);
+  }, []);
+
+  const maximized = height >= window.innerHeight * 0.8;
+  const toggleMax = () => {
+    if (maximized) setHeight(prevH.current || 240);
+    else {
+      prevH.current = height;
+      setHeight(Math.round(window.innerHeight * 0.82));
+    }
+    setOpen(true);
+  };
 
   const nodes = deriveNodes(run.exec);
   const toolCount = nodes.filter((n) => n.kind === "tool").length;
@@ -38,6 +68,8 @@ export function BottomDrawer({ run }: { run: RunState }) {
   return (
     <div className="shrink-0 border-t border-line bg-ink-900">
       {approval && run.taskId && <ApprovalBar taskId={run.taskId} node={approval.node} title={approval.title} summary={approval.summary} />}
+      {/* 拖拽调高手柄（横跨顶边） */}
+      {open && <div onMouseDown={startResize} className="h-1 cursor-ns-resize bg-transparent hover:bg-brand/40 transition" title="拖动调整高度" />}
       <div className="flex items-center border-b border-line px-2">
         <Tabs
           tabs={tabs}
@@ -48,13 +80,20 @@ export function BottomDrawer({ run }: { run: RunState }) {
           }}
         />
         <span className={cn("ml-2 text-[11px]", statusCls)}>{statusText}</span>
-        <button onClick={() => setOpen((o) => !o)} className="ml-auto flex items-center gap-1 px-2 py-2 text-xs text-slate-500 hover:text-slate-300">
+        <div className="ml-auto flex items-center">
+          {open && (
+            <button onClick={toggleMax} className="flex items-center px-2 py-2 text-slate-500 hover:text-slate-300" title={maximized ? "还原" : "最大化"}>
+              {maximized ? <Minimize2 className="h-3.5 w-3.5" /> : <Maximize2 className="h-3.5 w-3.5" />}
+            </button>
+          )}
+          <button onClick={() => setOpen((o) => !o)} className="flex items-center gap-1 px-2 py-2 text-xs text-slate-500 hover:text-slate-300">
             {open ? <ChevronDown className="h-3.5 w-3.5" /> : <ChevronUp className="h-3.5 w-3.5" />}
             {open ? "收起" : "展开"}
           </button>
         </div>
+      </div>
       {open && (
-        <div className="h-44 overflow-auto p-3 text-xs">
+        <div className="overflow-auto p-3 text-xs" style={{ height }}>
           {tab === "output" && <OutputView output={run.output} />}
           {tab === "trace" && <ExecTrace events={run.exec} phase={run.phase} />}
           {tab === "tools" && <ToolCalls run={run} />}
@@ -123,26 +162,19 @@ function ApprovalBar({ taskId, node, title, summary }: { taskId: string; node: s
 // OutputView：渲染模型输出。含 ```chart 块时分段渲染（文本 + SVG 图表），否则纯文本。
 function OutputView({ output }: { output: string }) {
   if (!output) {
-    return (
+    return <div className="text-xs leading-relaxed text-slate-500">在编排页搭图 → 运行，模型注入画像与历史后流式作答，结果在此渲染（支持 Markdown 与图表）。</div>;
-      <pre className="whitespace-pre-wrap font-mono leading-relaxed text-emerald-300">
-        在编排页搭图 → 运行，模型注入画像与历史后流式作答，token 在此呈现。
-      </pre>
-    );
   }
   if (!hasChart(output)) {
-    return <pre className="whitespace-pre-wrap font-mono leading-relaxed text-emerald-300">{output}</pre>;
+    return <Markdown text={output} className="text-[13px]" />;
   }
+  // 含 ```chart 块：文本段渲染 Markdown，图表段渲染 SVG，保持原顺序。
   return (
     <div>
       {extractChartBlocks(output).map((seg, i) =>
         seg.kind === "chart" ? (
           <ChartView key={i} spec={seg.spec} />
         ) : (
-          seg.text.trim() && (
+          seg.text.trim() && <Markdown key={i} text={seg.text} className="text-[13px]" />
-            <pre key={i} className="whitespace-pre-wrap font-mono leading-relaxed text-emerald-300">
-              {seg.text}
-            </pre>
-          )
         ),
       )}
     </div>