feat(scheduling): add full-screen SwapPreview for screenshot sharing

New SwapPreview component replaces direct "发送通知" button:
- Full-screen white background for clean screenshots
- Swap diagram: current vehicle → arrow → replacement vehicle
- Replacement reason section
- Post-swap prediction: predicted mileage, target, conclusion
- "发送替换通知" button at bottom
- Candidate button in detail modal changed to "查看替换方案 →"

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/modules/scheduling/SuggestionDetail.tsx

@@ -1,11 +1,11 @@
 import { useState } from 'react';
 import {
-  X, MapPin, AlertTriangle, CheckCircle, Send, ArrowDown, ArrowUp,
+  X, MapPin, AlertTriangle, CheckCircle, ArrowDown, ArrowUp, ArrowRight,
 } from 'lucide-react';
 import { motion } from 'motion/react';
-import { sendNotify } from './api';
 import type { SchedulingSuggestion, CandidateVehicle } from './types';
 import Blur from '../../components/Blur';
+import SwapPreview from './SwapPreview';
 
 interface Props {
   suggestion: SchedulingSuggestion;
@@ -23,34 +23,12 @@ function fmtRate(rate: number): string {
 }
 
 export default function SuggestionDetail({ suggestion: s, onClose, onNotifySuccess }: Props) {
-  const [sending, setSending] = useState(false);
+  const [previewCandidate, setPreviewCandidate] = useState<CandidateVehicle | null>(null);
   const [sentPlates, setSentPlates] = useState<Set<string>>(new Set());
 
   const v = s.currentVehicle;
   const isRescue = s.type === 'rescue_hopeless';
 
-  const handleNotify = async (candidate: CandidateVehicle) => {
-    if (sending || sentPlates.has(candidate.plateNumber)) return;
-    setSending(true);
-    try {
-      const result = await sendNotify({
-        suggestionId: s.id,
-        currentPlate: v.plateNumber,
-        candidatePlate: candidate.plateNumber,
-      });
-      if (result.success) {
-        setSentPlates(prev => new Set(prev).add(candidate.plateNumber));
-        onNotifySuccess();
-      } else {
-        alert(result.message || '发送失败');
-      }
-    } catch {
-      alert('网络错误，请重试');
-    } finally {
-      setSending(false);
-    }
-  };
-
   return (
     <div className="fixed inset-0 bg-black/50 backdrop-blur-sm z-[60] flex items-end sm:items-center justify-center" onClick={onClose}>
       <motion.div
@@ -178,15 +156,15 @@ export default function SuggestionDetail({ suggestion: s, onClose, onNotifySucce
                     {/* Action */}
                     <div className="px-3 pb-2.5">
                       <button
-                        onClick={() => handleNotify(c)}
-                        disabled={sending || sent}
+                        onClick={() => setPreviewCandidate(c)}
+                        disabled={sent}
                         className={`w-full flex items-center justify-center gap-1.5 text-[11px] font-bold py-2 rounded-lg transition-all cursor-pointer ${
                           sent
-                            ? 'bg-slate-100 text-slate-400'
+                            ? 'bg-emerald-50 text-emerald-600'
                             : 'bg-slate-800 hover:bg-slate-900 text-white active:scale-[0.98] shadow-sm'
                         }`}
                       >
-                        {sent ? <><CheckCircle size={12} /> 已发送</> : <><Send size={12} /> 发送替换通知</>}
+                        {sent ? <><CheckCircle size={12} /> 已通知</> : <>查看替换方案 <ArrowRight size={12} /></>}
                       </button>
                     </div>
                   </div>
@@ -206,6 +184,20 @@ export default function SuggestionDetail({ suggestion: s, onClose, onNotifySucce
           </button>
         </div>
       </motion.div>
+
+      {/* Full-screen swap preview */}
+      {previewCandidate && (
+        <SwapPreview
+          suggestion={s}
+          candidate={previewCandidate}
+          onClose={() => setPreviewCandidate(null)}
+          onSuccess={() => {
+            setSentPlates(prev => new Set(prev).add(previewCandidate.plateNumber));
+            setPreviewCandidate(null);
+            onNotifySuccess();
+          }}
+        />
+      )}
     </div>
   );
 }