fixed deprecated warnings

refilc_mobile_ui/lib/common/panel/panel.dart

@@ -67,7 +67,7 @@ class PanelTitle extends StatelessWidget {
       child: DefaultTextStyle(
         style: Theme.of(context).textTheme.titleMedium!.copyWith(
             fontWeight: FontWeight.w600,
-            color: AppColors.of(context).text.withOpacity(0.65)),
+            color: AppColors.of(context).text.withValues(alpha: 0.65)),
         child: title,
       ),
     );

refilc_mobile_ui/lib/common/panel/panel_action_button.dart

@@ -23,18 +23,28 @@ class PanelActionButton extends StatelessWidget {
       padding: padding,
       shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.circular(8.0),
-        side: BorderSide(color: Theme.of(context).colorScheme.secondary.withOpacity(.6), width: 2),
+        side: BorderSide(
+            color:
+                Theme.of(context).colorScheme.secondary.withValues(alpha: .6),
+            width: 2),
       ),
       child: ListTile(
         leading: leading != null
             ? Theme(
-                data: Theme.of(context).copyWith(iconTheme: IconThemeData(color: Theme.of(context).colorScheme.secondary)),
+                data: Theme.of(context).copyWith(
+                    iconTheme: IconThemeData(
+                        color: Theme.of(context).colorScheme.secondary)),
                 child: leading!,
               )
             : null,
         trailing: trailing,
         title: title != null
-            ? DefaultTextStyle(style: Theme.of(context).textTheme.titleMedium!.copyWith(fontWeight: FontWeight.w500, fontSize: 15.0), child: title!)
+            ? DefaultTextStyle(
+                style: Theme.of(context)
+                    .textTheme
+                    .titleMedium!
+                    .copyWith(fontWeight: FontWeight.w500, fontSize: 15.0),
+                child: title!)
             : null,
         contentPadding: EdgeInsets.zero,
         visualDensity: VisualDensity.compact,

refilc_mobile_ui/lib/common/panel/panel_button.dart

@@ -36,8 +36,9 @@ class PanelButton extends StatelessWidget {
       shape: RoundedRectangleBorder(
           borderRadius: borderRadius ?? BorderRadius.circular(12.0)),
       fillColor: background
-          ? Colors.white.withOpacity(
-              Theme.of(context).brightness == Brightness.light ? .35 : .2)
+          ? Colors.white.withValues(
+              alpha:
+                  Theme.of(context).brightness == Brightness.light ? .35 : .2)
           : null,
       child: ListTile(
         leading: leading != null
@@ -57,7 +58,7 @@ class PanelButton extends StatelessWidget {
                     width: 2.0,
                     height: 32.0,
                     decoration: BoxDecoration(
-                      color: AppColors.of(context).text.withOpacity(.15),
+                      color: AppColors.of(context).text.withValues(alpha: .15),
                       borderRadius: BorderRadius.circular(45.0),
                     ),
                   ),