fix(legacy): replace hardcoded colors for dark mode contrast

modules/legacy/modules/device_management/lib/src/features/call_history/presentation/call_history_screen.dart

@@ -215,7 +215,7 @@ class _FilterBar extends StatelessWidget {
                                 ? FontWeight.w600
                                 : FontWeight.w500,
                             color: isSelected
-                                ? Colors.black87
+                                ? Theme.of(context).colorScheme.onSurface
                                 : Theme.of(context)
                                     .colorScheme
                                     .onSurfaceVariant,
@@ -324,7 +324,7 @@ class _CallTile extends StatelessWidget {
             fontSize: 15,
             fontWeight: FontWeight.w500,
             color: isAccepted
-                ? Colors.black87
+                ? Theme.of(context).colorScheme.onSurface
                 : Theme.of(context).colorScheme.error,
           ),
           maxLines: 1,

modules/legacy/modules/device_management/lib/src/features/device_management/widgets/call_watch_dialog.dart

@@ -75,7 +75,7 @@ class _CallWatchDialogState extends ConsumerState<CallWatchDialog> {
             textAlign: TextAlign.center,
             style: TextStyle(
               fontSize: SizeUtils.getByScreen(small: 13, big: 12),
-              color: Colors.black54,
+              color: Theme.of(context).colorScheme.onSurfaceVariant,
             ),
           ),
           SizedBox(height: SizeUtils.getByScreen(small: 12, big: 10)),

modules/legacy/modules/device_management/lib/src/features/remote_connection/presentation/widgets/spy_call_dialog.dart

@@ -102,7 +102,7 @@ class _SpyCallDialogState extends ConsumerState<SpyCallDialog> {
             textAlign: TextAlign.center,
             style: TextStyle(
               fontSize: SizeUtils.getByScreen(small: 13, big: 12),
-              color: Colors.black54,
+              color: Theme.of(context).colorScheme.onSurfaceVariant,
             ),
           ),
           SizedBox(height: SizeUtils.getByScreen(small: 12, big: 10)),