fixing a ton of sloppy mess...

walkguide-mobile/walkguide_app/lib/features/walk_guide/walk_guide_screen.dart

@@ -466,7 +466,7 @@ class _Pill extends StatelessWidget {
   Widget build(BuildContext context) {
     return DecoratedBox(
       decoration: BoxDecoration(
-          color: color.withOpacity(0.16),
+          color: color.withValues(alpha: 0.16),
           borderRadius: BorderRadius.circular(999),
           border: Border.all(color: color)),
       child: Padding(
@@ -506,12 +506,10 @@ class _EmptyPanel extends StatelessWidget {
   final IconData icon;
   final String title;
   final String message;
-  final Widget? action;
   const _EmptyPanel(
       {required this.icon,
       required this.title,
-      required this.message,
-      this.action});
+      required this.message});
 
   @override
   Widget build(BuildContext context) {
@@ -533,10 +531,6 @@ class _EmptyPanel extends StatelessWidget {
                   const TextStyle(fontWeight: FontWeight.w800, fontSize: 18)),
           const SizedBox(height: 6),
           Text(message, textAlign: TextAlign.center),
-          if (action != null) ...[
-            const SizedBox(height: 12),
-            action!,
-          ],
         ],
       ),
     );