refactor: 穿搭页删标题、日期改为同排两个日期框

lib/features/outfit/outfit_page.dart

@@ -17,7 +17,8 @@ class OutfitPage extends ConsumerStatefulWidget {
 }
 
 class _OutfitPageState extends ConsumerState<OutfitPage> {
-  DateTimeRange? _dateRange;
+  DateTime? _startDate;
+  DateTime? _endDate;
   final _locationCtrl = TextEditingController();
   String _occasion = '通勤';
   bool _submitting = false;
@@ -30,40 +31,62 @@ class _OutfitPageState extends ConsumerState<OutfitPage> {
     super.dispose();
   }
 
-  Future<void> _pickDateRange() async {
+  Future<void> _pickStartDate() async {
     final now = DateTime.now();
-    final range = await showDateRangePicker(
+    final date = await showDatePicker(
       context: context,
       firstDate: now,
       lastDate: now.add(const Duration(days: 30)),
-      initialDateRange: _dateRange ??
-          DateTimeRange(start: now, end: now.add(const Duration(days: 2))),
+      initialDate: _startDate ?? now,
     );
-    if (range != null) setState(() => _dateRange = range);
+    if (date == null) return;
+    setState(() {
+      _startDate = date;
+      if (_endDate != null && _endDate!.isBefore(date)) {
+        _endDate = date;
+      }
+    });
+  }
+
+  Future<void> _pickEndDate() async {
+    final now = DateTime.now();
+    final first = _startDate ?? now;
+    final date = await showDatePicker(
+      context: context,
+      firstDate: first,
+      lastDate: first.add(const Duration(days: 30)),
+      initialDate: _endDate ?? first,
+    );
+    if (date != null) setState(() => _endDate = date);
   }
 
   String _fmt(DateTime d) =>
       '${d.year}-${d.month.toString().padLeft(2, '0')}-${d.day.toString().padLeft(2, '0')}';
 
   Future<void> _generate() async {
-    final range = _dateRange;
+    final start = _startDate;
+    final end = _endDate;
     final location = _locationCtrl.text.trim();
-    if (range == null) {
-      Fluttertoast.showToast(msg: '请选择日期范围');
+    if (start == null) {
+      Fluttertoast.showToast(msg: '请选择开始日期');
+      return;
+    }
+    if (end == null) {
+      Fluttertoast.showToast(msg: '请选择结束日期');
       return;
     }
     if (location.isEmpty) {
       Fluttertoast.showToast(msg: '请输入地点');
       return;
     }
-    if (range.duration.inDays < 1) {
+    if (end.difference(start).inDays < 1) {
       Fluttertoast.showToast(msg: '日期范围至少 1 天');
       return;
     }
     setState(() => _submitting = true);
     final ok = await ref.read(generateProvider.notifier).generate(
-          startDate: _fmt(range.start),
-          endDate: _fmt(range.end),
+          startDate: _fmt(start),
+          endDate: _fmt(end),
           location: location,
           occasion: _occasion,
         );
@@ -80,7 +103,6 @@ class _OutfitPageState extends ConsumerState<OutfitPage> {
   Widget build(BuildContext context) {
     final plans = ref.watch(outfitPlanProvider);
     final gen = ref.watch(generateProvider);
-    final scheme = Theme.of(context).colorScheme;
 
     return Scaffold(
       appBar: AppBar(title: const Text('造型穿搭')),
@@ -95,18 +117,28 @@ class _OutfitPageState extends ConsumerState<OutfitPage> {
                 child: Column(
                   crossAxisAlignment: CrossAxisAlignment.start,
                   children: [
-                    Text('生成穿搭方案',
-                        style: TextStyle(
-                            fontSize: 16,
-                            fontWeight: FontWeight.bold,
-                            color: scheme.primary)),
-                    const SizedBox(height: 12),
-                    OutlinedButton.icon(
-                      onPressed: _submitting ? null : _pickDateRange,
-                      icon: const Icon(Icons.date_range_outlined),
-                      label: Text(_dateRange == null
-                          ? '选择日期范围'
-                          : '${_fmt(_dateRange!.start)} ~ ${_fmt(_dateRange!.end)}'),
+                    Row(
+                      children: [
+                        Expanded(
+                          child: OutlinedButton.icon(
+                            onPressed: _submitting ? null : _pickStartDate,
+                            icon: const Icon(Icons.date_range_outlined),
+                            label: Text(_startDate == null
+                                ? '开始日期'
+                                : _fmt(_startDate!)),
+                          ),
+                        ),
+                        const SizedBox(width: 8),
+                        Expanded(
+                          child: OutlinedButton.icon(
+                            onPressed: _submitting ? null : _pickEndDate,
+                            icon: const Icon(Icons.date_range_outlined),
+                            label: Text(_endDate == null
+                                ? '结束日期'
+                                : _fmt(_endDate!)),
+                          ),
+                        ),
+                      ],
                     ),
                     const SizedBox(height: 12),
                     TextField(