feat(web): 召回归因调试-证据链面板加全屏按钮

为什么召·证据链(T0)面板右上角加全屏切换(Maximize2/Minimize2);CSS 固定覆盖式全屏(fixed inset-0 z-50,内容区 overflow-auto 可滚),Esc 退出。便于看长 JSON 原始报文。

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

apps/pac-web/src/components/recall-debug/recall-debug-app.tsx

@@ -6,6 +6,7 @@ import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
 import { ApiError } from '@/lib/api-client';
+import { Maximize2, Minimize2 } from 'lucide-react';
 import {
   recallDebugApi,
   type PatientCandidate,
@@ -239,12 +240,36 @@ function WhyRecalled({ data }: { data: RecallDebugReport }) {
   }, [plans]);
   const selected = plans.find((p) => p.planId === selectedId) ?? plans[0] ?? null;
 
+  // 证据链面板可全屏(CSS 固定覆盖,Esc 退出)
+  const [fullscreen, setFullscreen] = useState(false);
+  useEffect(() => {
+    if (!fullscreen) return;
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') setFullscreen(false);
+    };
+    window.addEventListener('keydown', onKey);
+    return () => window.removeEventListener('keydown', onKey);
+  }, [fullscreen]);
+
   return (
-    <Card>
-      <CardHeader>
+    <Card
+      className={
+        fullscreen ? 'fixed inset-0 z-50 m-0 flex flex-col overflow-hidden rounded-none' : undefined
+      }
+    >
+      <CardHeader className="flex flex-row items-center justify-between space-y-0">
         <CardTitle className="text-base">为什么召 · 证据链(T0)</CardTitle>
+        <button
+          type="button"
+          onClick={() => setFullscreen((v) => !v)}
+          title={fullscreen ? '退出全屏 (Esc)' : '全屏'}
+          aria-label={fullscreen ? '退出全屏' : '全屏'}
+          className="rounded p-1 text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
+        >
+          {fullscreen ? <Minimize2 className="h-4 w-4" /> : <Maximize2 className="h-4 w-4" />}
+        </button>
       </CardHeader>
-      <CardContent className="space-y-4">
+      <CardContent className={fullscreen ? 'flex-1 space-y-4 overflow-auto' : 'space-y-4'}>
         {!hasActivePlan && (
           <p className="text-sm text-muted-foreground">
             无 active plan。