style: 全项目紫色→薄荷绿 Fresh Air 清新风

- 主色 #635BFF→#14B8A6 (薄荷绿)
- 浅紫 #EDEBFF→#E6FAF6 (极浅薄荷)
- 深紫 #4B44D6→#0F9D8E (深薄荷)
- 渐变紫→薄荷渐变
- 全局13种紫色映射替换

health_app/lib/pages/medication/medication_edit_page.dart

@@ -99,7 +99,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
       ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(
           content: Text('已添加 ${_items.length} 种药品'),
-          backgroundColor: const Color(0xFF635BFF),
+          backgroundColor: const Color(0xFF14B8A6),
         ),
       );
       ref.invalidate(medicationListProvider);
@@ -136,7 +136,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      backgroundColor: const Color(0xFFF8F7FF),
+      backgroundColor: const Color(0xFFF6F9FB),
       appBar: AppBar(
         backgroundColor: Colors.white,
         elevation: 0,
@@ -158,7 +158,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
             child: const Text(
               '保存',
               style: TextStyle(
-                color: Color(0xFF635BFF),
+                color: Color(0xFF14B8A6),
                 fontWeight: FontWeight.w600,
               ),
             ),
@@ -204,7 +204,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
                 style: const TextStyle(
                   fontSize: 13,
                   fontWeight: FontWeight.w600,
-                  color: Color(0xFF635BFF),
+                  color: Color(0xFF14B8A6),
                 ),
               ),
               if (_items.length > 1)
@@ -390,7 +390,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
         child: Row(
           mainAxisSize: MainAxisSize.min,
           children: [
-            const Icon(Icons.access_time, size: 16, color: Color(0xFF635BFF)),
+            const Icon(Icons.access_time, size: 16, color: Color(0xFF14B8A6)),
             const SizedBox(width: 6),
             Text(
               time.format(context),
@@ -410,11 +410,11 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
         icon: const Icon(Icons.add, size: 18),
         label: const Text('添加', style: TextStyle(fontSize: 14)),
         style: OutlinedButton.styleFrom(
-          foregroundColor: const Color(0xFF635BFF),
-          side: const BorderSide(color: Color(0xFFD5D1FF)),
+          foregroundColor: const Color(0xFF14B8A6),
+          side: const BorderSide(color: Color(0xFFC0E8E2)),
           padding: const EdgeInsets.symmetric(vertical: 12),
           shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
-          backgroundColor: const Color(0xFFF5F3FF),
+          backgroundColor: const Color(0xFFF2FAF9),
         ),
       ),
     );
@@ -438,7 +438,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
       ),
       focusedBorder: OutlineInputBorder(
         borderRadius: BorderRadius.circular(8),
-        borderSide: const BorderSide(color: Color(0xFF635BFF)),
+        borderSide: const BorderSide(color: Color(0xFF14B8A6)),
       ),
     );
   }