chore: fix Flutter baseline checks

lib/widgets/color_picker.dart

@@ -1,4 +1,3 @@
-import 'dart:math';
 import 'package:flutter/material.dart';
 
 /// Простой цветовой пикер в виде HSV-слайдеров.

lib/widgets/group_card.dart

@@ -23,6 +23,9 @@ class _GroupCardState extends ConsumerState<GroupCard> {
   double? _localBrightness;
   double? _localTemp;
 
+  int _channelValue(double channel) =>
+      (channel * 255.0).round().clamp(0, 255);
+
   @override
   Widget build(BuildContext context) {
     final g = widget.group;
@@ -53,7 +56,10 @@ class _GroupCardState extends ConsumerState<GroupCard> {
         decoration: BoxDecoration(
           borderRadius: BorderRadius.circular(16),
           border: isOn
-              ? Border.all(color: cardAccent.withOpacity(0.3), width: 1)
+              ? Border.all(
+                  color: cardAccent.withValues(alpha: 0.3),
+                  width: 1,
+                )
               : null,
         ),
         child: Padding(
@@ -84,7 +90,7 @@ class _GroupCardState extends ConsumerState<GroupCard> {
                     ),
                   Switch(
                     value: isOn,
-                    activeColor: Colors.deepOrange,
+                    activeThumbColor: Colors.deepOrange,
                     onChanged: (v) =>
                         ref.read(groupsProvider.notifier).toggleGroup(id, v),
                   ),
@@ -166,7 +172,12 @@ class _GroupCardState extends ConsumerState<GroupCard> {
                     initialColor: Color.fromARGB(255, r, gVal, b),
                     onColorChanged: (c) {
                       // Обновление UI-превью -- через debounce отправляется на сервер
-                      ref.read(groupsProvider.notifier).setColor(id, c.red, c.green, c.blue);
+                      ref.read(groupsProvider.notifier).setColor(
+                            id,
+                            _channelValue(c.r),
+                            _channelValue(c.g),
+                            _channelValue(c.b),
+                          );
                     },
                   ),
 
@@ -257,7 +268,9 @@ class _ModeChip extends StatelessWidget {
         duration: const Duration(milliseconds: 200),
         padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
         decoration: BoxDecoration(
-          color: selected ? Colors.deepOrange.withOpacity(0.2) : Colors.white10,
+          color: selected
+              ? Colors.deepOrange.withValues(alpha: 0.2)
+              : Colors.white10,
           borderRadius: BorderRadius.circular(20),
           border: selected
               ? Border.all(color: Colors.deepOrange, width: 1)