水印优化+ORC优化

test/watermark_test.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:image/image.dart' as img;
 
+import 'package:qiangbao_accounting/models/photo.dart';
 import 'package:qiangbao_accounting/models/watermark.dart';
 import 'package:qiangbao_accounting/pages/watermark/watermark_painter.dart';
 
@@ -211,6 +212,57 @@ void main() {
     });
   });
 
+  group('照片记录还原成水印数据', () {
+    test('天气和温度能从拼在一起的那个字段拆回来', () {
+      expect(splitWeatherText('晴 25℃'), (weather: '晴', temperature: '25℃'));
+      expect(splitWeatherText('多云 18℃'), (weather: '多云', temperature: '18℃'));
+    });
+
+    test('只有天气 / 只有温度 / 空，三种都要兜住', () {
+      expect(splitWeatherText('晴'), (weather: '晴', temperature: ''));
+      expect(splitWeatherText('25℃'), (weather: '', temperature: '25℃'));
+      expect(splitWeatherText(''), (weather: '', temperature: ''));
+      expect(splitWeatherText('   '), (weather: '', temperature: ''));
+    });
+
+    test('★ 重新打水印时复用当时的地点和天气（不是你现在站的地方）', () {
+      const photo = PhotoItem(
+        id: 7,
+        url: '/uploads/photo/a.jpg',
+        thumbUrl: null,
+        takenAt: '2026-09-28 14:30',
+        address: '云南省昆明市五华区',
+        weather: '晴 25℃',
+        remark: '和宝一起',
+        latitude: 25.0,
+        longitude: 102.7,
+      );
+
+      final data = photo.toWatermarkData();
+
+      expect(data.address, '云南省昆明市五华区');
+      expect(data.weather, '晴');
+      expect(data.temperature, '25℃');
+      expect(data.remark, '和宝一起');
+      expect(data.time, DateTime(2026, 9, 28, 14, 30));
+    });
+
+    test('拍摄时间解析不出来时退回当前时间，不崩', () {
+      const photo = PhotoItem(
+        id: 1,
+        url: '',
+        thumbUrl: null,
+        takenAt: '',
+        address: '',
+        weather: '',
+        remark: '',
+        latitude: null,
+        longitude: null,
+      );
+      expect(photo.toWatermarkData().time, isNotNull);
+    });
+  });
+
   group('绘制', () {
     test('paintWatermark 在真实画布上不抛异常', () {
       final recorder = ui.PictureRecorder();