fix：日历选择交互

lib/features/assets/presentation/asset_edit_page.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:shadcn_ui/shadcn_ui.dart';
 
@@ -50,6 +51,39 @@ class _AssetEditPageState extends ConsumerState<AssetEditPage> {
     _channelCtrl = TextEditingController(text: _holding.channel ?? '');
   }
 
+  Future<void> pickDate(BuildContext context) async {
+    final today = DateTime.now();
+    final parsed = _parseDate(_dateCtrl.text.trim()) ?? _holding.purchaseDate;
+    final initialDate = parsed == null
+        ? today
+        : parsed.isBefore(DateTime(2000))
+            ? DateTime(2000)
+            : parsed.isAfter(today)
+                ? today
+                : parsed;
+    final picked = await showDatePicker(
+      context: context,
+      initialDate: initialDate,
+      firstDate: DateTime(2000),
+      lastDate: today,
+      initialEntryMode: DatePickerEntryMode.calendarOnly,
+      locale: const Locale('zh'),
+    );
+    if (picked == null || !mounted) return;
+    setState(() {
+      _dateCtrl.text = _formatDate(picked);
+    });
+  }
+
+  String _formatDate(DateTime value) {
+    return '${value.year}-${value.month.toString().padLeft(2, '0')}-${value.day.toString().padLeft(2, '0')}';
+  }
+
+  DateTime? _parseDate(String value) {
+    if (value.isEmpty) return null;
+    return DateTime.tryParse(value);
+  }
+
   @override
   void dispose() {
     _weightCtrl.dispose();
@@ -214,6 +248,9 @@ class _AssetEditPageState extends ConsumerState<AssetEditPage> {
                       keyboardType: const TextInputType.numberWithOptions(
                         decimal: true,
                       ),
+                      inputFormatters: [
+                        FilteringTextInputFormatter.allow(RegExp(r'[0-9.]')),
+                      ],
                       textAlign: TextAlign.right,
                       decoration: const InputDecoration(
                         border: InputBorder.none,
@@ -227,6 +264,8 @@ class _AssetEditPageState extends ConsumerState<AssetEditPage> {
                     label: '购买日期',
                     child: TextField(
                       controller: _dateCtrl,
+                      readOnly: true,
+                      onTap: () => pickDate(context),
                       textAlign: TextAlign.right,
                       decoration: const InputDecoration(
                         border: InputBorder.none,