refactor(apps): 主题系统迁移至 ColorScheme + 扩展架构并支持 Dark Mode

apps/lib/features/messages/presentation/widgets/calendar_message_card.dart

@@ -25,6 +25,7 @@ class CalendarInviteCard extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final l10n = context.l10n;
+    final colorScheme = Theme.of(context).colorScheme;
 
     return Container(
       margin: const EdgeInsets.symmetric(
@@ -33,9 +34,9 @@ class CalendarInviteCard extends StatelessWidget {
       ),
       padding: const EdgeInsets.all(AppSpacing.md),
       decoration: BoxDecoration(
-        color: AppColors.white,
+        color: colorScheme.surface,
         borderRadius: BorderRadius.circular(AppRadius.md),
-        border: Border.all(color: AppColors.border),
+        border: Border.all(color: colorScheme.outlineVariant),
       ),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
@@ -45,12 +46,12 @@ class CalendarInviteCard extends StatelessWidget {
               Container(
                 padding: const EdgeInsets.all(8),
                 decoration: BoxDecoration(
-                  color: AppColors.blue100,
+                  color: colorScheme.primaryContainer,
                   borderRadius: BorderRadius.circular(AppRadius.sm),
                 ),
-                child: const Icon(
+                child: Icon(
                   Icons.calendar_today,
-                  color: AppColors.blue600,
+                  color: colorScheme.primary,
                   size: 20,
                 ),
               ),
@@ -71,7 +72,7 @@ class CalendarInviteCard extends StatelessWidget {
             eventTitle != null
                 ? l10n.messagesCalendarCardInviteWithTitle(eventTitle!)
                 : l10n.messagesCalendarCardInviteWithoutTitle,
-            style: const TextStyle(fontSize: 14, color: AppColors.slate700),
+            style: TextStyle(fontSize: 14, color: colorScheme.onSurfaceVariant),
           ),
           const SizedBox(height: AppSpacing.md),
           Row(
@@ -112,6 +113,7 @@ class CalendarUpdateCard extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final l10n = context.l10n;
+    final colorScheme = Theme.of(context).colorScheme;
 
     return GestureDetector(
       onTap: onTap,
@@ -122,21 +124,21 @@ class CalendarUpdateCard extends StatelessWidget {
         ),
         padding: const EdgeInsets.all(AppSpacing.md),
         decoration: BoxDecoration(
-          color: AppColors.white,
+          color: colorScheme.surface,
           borderRadius: BorderRadius.circular(AppRadius.md),
-          border: Border.all(color: AppColors.border),
+          border: Border.all(color: colorScheme.outlineVariant),
         ),
         child: Row(
           children: [
             Container(
               padding: const EdgeInsets.all(8),
               decoration: BoxDecoration(
-                color: AppColors.blue100,
+                color: colorScheme.primaryContainer,
                 borderRadius: BorderRadius.circular(AppRadius.sm),
               ),
-              child: const Icon(
+              child: Icon(
                 Icons.calendar_today,
-                color: AppColors.blue600,
+                color: colorScheme.primary,
                 size: 20,
               ),
             ),
@@ -157,15 +159,15 @@ class CalendarUpdateCard extends StatelessWidget {
                   const SizedBox(height: 2),
                   Text(
                     _formatTime(context, message.createdAt),
-                    style: const TextStyle(
+                    style: TextStyle(
                       fontSize: 12,
-                      color: AppColors.slate500,
+                      color: colorScheme.onSurfaceVariant,
                     ),
                   ),
                 ],
               ),
             ),
-            const Icon(Icons.chevron_right, color: AppColors.slate400),
+            Icon(Icons.chevron_right, color: colorScheme.outline),
           ],
         ),
       ),
@@ -201,6 +203,7 @@ class CalendarDeleteCard extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final l10n = context.l10n;
+    final colorScheme = Theme.of(context).colorScheme;
 
     return Container(
       margin: const EdgeInsets.symmetric(
@@ -209,21 +212,21 @@ class CalendarDeleteCard extends StatelessWidget {
       ),
       padding: const EdgeInsets.all(AppSpacing.md),
       decoration: BoxDecoration(
-        color: AppColors.slate50,
+        color: colorScheme.surfaceContainerLowest,
         borderRadius: BorderRadius.circular(AppRadius.md),
-        border: Border.all(color: AppColors.slate200),
+        border: Border.all(color: colorScheme.outlineVariant),
       ),
       child: Row(
         children: [
           Container(
             padding: const EdgeInsets.all(8),
             decoration: BoxDecoration(
-              color: AppColors.slate200,
+              color: colorScheme.surfaceContainerHigh,
               borderRadius: BorderRadius.circular(AppRadius.sm),
             ),
-            child: const Icon(
+            child: Icon(
               Icons.calendar_today,
-              color: AppColors.slate500,
+              color: colorScheme.onSurfaceVariant,
               size: 20,
             ),
           ),
@@ -233,7 +236,10 @@ class CalendarDeleteCard extends StatelessWidget {
               eventTitle != null
                   ? l10n.messagesCalendarCardDeletedWithTitle(eventTitle!)
                   : l10n.messagesCalendarCardDeletedWithoutTitle,
-              style: const TextStyle(fontSize: 14, color: AppColors.slate500),
+              style: TextStyle(
+                fontSize: 14,
+                color: colorScheme.onSurfaceVariant,
+              ),
             ),
           ),
         ],