Fixed most of the warnings

lib/widgets/add_server/add_server_modal.dart

@@ -157,7 +157,7 @@ class _AddServerModalState extends State<AddServerModal> {
       if (result != AuthStatus.success) {
         cancelConnecting();
         if (mounted) {
-          showSnacbkar(
+          showSnackbar(
             appConfigProvider: appConfigProvider, 
             label: getErrorMessage(result), 
             color: Colors.red
@@ -206,7 +206,7 @@ class _AddServerModalState extends State<AddServerModal> {
       if (serverCreated != null) {
         if (mounted) setState(() => isConnecting = false);
         if (mounted) {
-          showSnacbkar(
+          showSnackbar(
             appConfigProvider: appConfigProvider, 
             label: AppLocalizations.of(context)!.connectionNotCreated, 
             color: Colors.red
@@ -256,7 +256,7 @@ class _AddServerModalState extends State<AddServerModal> {
       if (result != AuthStatus.success) {
         cancelConnecting();
         if (mounted) {
-          showSnacbkar(
+          showSnackbar(
             appConfigProvider: appConfigProvider, 
             label: getErrorMessage(result), 
             color: Colors.red
@@ -306,7 +306,7 @@ class _AddServerModalState extends State<AddServerModal> {
           )
         );
         if (mounted) {
-          showSnacbkar(
+          showSnackbar(
             appConfigProvider: appConfigProvider, 
             label: AppLocalizations.of(context)!.connectionNotCreated, 
             color: Colors.red

lib/widgets/add_server/form_text_field.dart

@@ -13,7 +13,7 @@ class FormTextField extends StatelessWidget {
   final bool isConnecting;
 
   const FormTextField({
-    Key? key,
+    super.key,
     required this.label,
     required this.controller,
     this.error,
@@ -24,7 +24,7 @@ class FormTextField extends StatelessWidget {
     this.hintText,
     this.helperText,
     required this.isConnecting
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/widgets/combined_line_chart.dart

@@ -15,12 +15,12 @@ class CustomCombinedLineChart extends StatelessWidget {
   final bool daysInterval;
 
   const CustomCombinedLineChart({
-    Key? key,
+    super.key,
     required this.inputData,
     required this.context,
     required this.dates,
     required this.daysInterval
-  }) : super(key: key);
+  });
 
   LineChartData mainData(Map<String, dynamic> data, ThemeMode selectedTheme) {
     String chartDate(DateTime date) {
@@ -55,11 +55,11 @@ class CustomCombinedLineChart extends StatelessWidget {
     }
 
     return LineChartData(
-      gridData: FlGridData(
+      gridData: const FlGridData(
         show: false,
         drawVerticalLine: false,
       ),
-      titlesData: FlTitlesData(
+      titlesData: const FlTitlesData(
         show: false,
       ),
       borderData: FlBorderData(
@@ -73,7 +73,7 @@ class CustomCombinedLineChart extends StatelessWidget {
           barWidth: 2,
           isStrokeCapRound: true,
           preventCurveOverShooting: true,
-          dotData: FlDotData(
+          dotData: const FlDotData(
             show: false,
           ),
           belowBarData: BarAreaData(

lib/widgets/confirm_action_modal.dart

@@ -8,12 +8,12 @@ class ConfirmActionModal extends StatelessWidget {
   final void Function() onConfirm;
 
   const ConfirmActionModal({
-    Key? key,
+    super.key,
     required this.icon,
     required this.title,
     required this.message,
     required this.onConfirm
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/widgets/custom_checkbox_list_tile.dart

@@ -9,14 +9,14 @@ class CustomCheckboxListTile extends StatelessWidget {
   final EdgeInsets? padding;
 
   const CustomCheckboxListTile({
-    Key? key,
+    super.key,
     required this.value,
     required this.onChanged,
     required this.title,
     this.disabled,
     this.subtitle,
     this.padding
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/widgets/custom_list_tile.dart

@@ -14,7 +14,7 @@ class CustomListTile extends StatelessWidget {
   final Color? color;
 
   const CustomListTile({
-    Key? key,
+    super.key,
     required this.title,
     this.subtitle,
     this.subtitleWidget,
@@ -26,7 +26,7 @@ class CustomListTile extends StatelessWidget {
     this.disabled,
     this.onHover,
     this.color,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/widgets/custom_radio.dart

@@ -7,12 +7,12 @@ class CustomRadio extends StatelessWidget {
   final Color backgroundColor;
 
   const CustomRadio({
-    Key? key,
+    super.key,
     required this.value,
     required this.groupValue,
     this.onChange,
     required this.backgroundColor,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/widgets/custom_radio_list_tile.dart

@@ -11,14 +11,14 @@ class CustomRadioListTile extends StatelessWidget {
   final void Function(String) onChanged;
 
   const CustomRadioListTile({
-    Key? key,
+    super.key,
     required this.groupValue,
     required this.value,
     required this.radioBackgroundColor,
     required this.title,
     this.subtitle,
     required this.onChanged,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/widgets/custom_radio_toggle.dart

@@ -7,12 +7,12 @@ class CustomRadioToggle extends StatelessWidget {
   final void Function(String) onTap;
 
   const CustomRadioToggle({
-    Key? key,
+    super.key,
     required this.groupSelected,
     required this.value,
     required this.label,
     required this.onTap,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/widgets/line_chart.dart

@@ -13,13 +13,13 @@ class CustomLineChart extends StatelessWidget {
   final BuildContext context;
 
   const CustomLineChart({
-    Key? key,
+    super.key,
     required this.data,
     required this.color,
     required this.dates,
     required this.daysInterval,
     required this.context
-  }) : super(key: key);
+  });
 
   String chartDate(DateTime date) {
     String twoDigits(int number) => number.toString().padLeft(2, '0');
@@ -55,11 +55,11 @@ class CustomLineChart extends StatelessWidget {
 
   LineChartData mainData(Map<String, dynamic> data, ThemeMode selectedTheme) {
     return LineChartData(
-      gridData: FlGridData(
+      gridData: const FlGridData(
         show: false,
         drawVerticalLine: false,
       ),
-      titlesData: FlTitlesData(
+      titlesData: const FlTitlesData(
         show: false,
       ),
       borderData: FlBorderData(
@@ -73,7 +73,7 @@ class CustomLineChart extends StatelessWidget {
           barWidth: 2,
           isStrokeCapRound: true,
           preventCurveOverShooting: true,
-          dotData: FlDotData(
+          dotData: const FlDotData(
             show: false,
           ),
           belowBarData: BarAreaData(

lib/widgets/menu_bar.dart

@@ -11,9 +11,9 @@ class CustomMenuBar extends StatelessWidget {
   final Widget child;
 
   const CustomMenuBar({
-    Key? key,
+    super.key,
     required this.child
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/widgets/option_box.dart

@@ -7,12 +7,12 @@ class OptionBox extends StatelessWidget {
   final String label;
 
   const OptionBox({
-    Key? key,
+    super.key,
     required this.optionsValue,
     required this.itemValue,
     required this.onTap,
     required this.label,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/widgets/process_dialog.dart

@@ -4,9 +4,9 @@ class ProcessDialog extends StatelessWidget {
   final String message;
 
   const ProcessDialog({
-    Key? key,
+    super.key,
     required this.message,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/widgets/section_label.dart

@@ -5,10 +5,10 @@ class SectionLabel extends StatelessWidget {
   final EdgeInsets? padding;
 
   const SectionLabel({
-    Key? key,
+    super.key,
     required this.label,
     this.padding
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/widgets/servers_list/delete_modal.dart

@@ -13,9 +13,9 @@ class DeleteModal extends StatelessWidget {
   final Server serverToDelete;
 
   const DeleteModal({
-    Key? key,
+    super.key,
     required this.serverToDelete,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {
@@ -34,14 +34,14 @@ class DeleteModal extends StatelessWidget {
           appConfigProvider.setSelectedScreen(0);
         }
 
-        showSnacbkar(
+        showSnackbar(
           appConfigProvider: appConfigProvider, 
           label: AppLocalizations.of(context)!.connectionRemoved, 
           color: Colors.green
         );
       }
       else {
-        showSnacbkar(
+        showSnackbar(
           appConfigProvider: appConfigProvider, 
           label: AppLocalizations.of(context)!.connectionCannotBeRemoved, 
           color: Colors.red

lib/widgets/servers_list/server_tile_functions.dart

@@ -50,14 +50,15 @@ void showDeleteModal({
   required BuildContext context,
   required Server server
 }) async {
-  await Future.delayed(const Duration(seconds: 0), () => {
+  await Future.delayed(const Duration(seconds: 0), () {
+    if (!context.mounted) return;
     showDialog(
       context: context, 
       builder: (context) => DeleteModal(
         serverToDelete: server,
       ),
       barrierDismissible: false
-    )
+    );
   });
 }
 
@@ -133,7 +134,7 @@ void connectToServer({
     process.close();
     if (!context.mounted) return;
     final appConfigProvider = Provider.of<AppConfigProvider>(context, listen: false);
-    showSnacbkar(
+    showSnackbar(
       appConfigProvider: appConfigProvider, 
       label: AppLocalizations.of(context)!.cannotConnect, 
       color: Colors.red
@@ -150,14 +151,14 @@ void setDefaultServer({
   if (!context.mounted) return;
   final appConfigProvider = Provider.of<AppConfigProvider>(context, listen: false);
   if (result == null) {
-    showSnacbkar(
+    showSnackbar(
       appConfigProvider: appConfigProvider, 
       label: AppLocalizations.of(context)!.connectionDefaultSuccessfully, 
       color: Colors.green
     );
   }
   else {
-    showSnacbkar(
+    showSnackbar(
       appConfigProvider: appConfigProvider, 
       label: AppLocalizations.of(context)!.connectionDefaultFailed, 
       color: Colors.red

lib/widgets/servers_list/servers_list.dart

@@ -16,13 +16,13 @@ class ServersList extends StatelessWidget {
   final double breakingWidth;
 
   const ServersList({
-    Key? key,
+    super.key,
     required this.context,
     required this.controllers,
     required this.onChange,
     required this.scrollController,
     required this.breakingWidth
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/widgets/servers_list/servers_list_item.dart

@@ -68,7 +68,7 @@ class _ServersListItemState extends State<ServersListItem> with SingleTickerProv
       decoration: BoxDecoration(
         border: Border(
           bottom: BorderSide(
-            color: Theme.of(context).colorScheme.surfaceVariant,
+            color: Theme.of(context).colorScheme.surfaceContainerHighest,
             width: 1
           )
         )

lib/widgets/update_modal.dart

@@ -11,10 +11,10 @@ class UpdateModal extends StatefulWidget {
   final void Function(String, String) onDownload;
 
   const UpdateModal({
-    Key? key,
+    super.key,
     required this.gitHubRelease,
     required this.onDownload,
-  }) : super(key: key);
+  });
 
   @override
   State<UpdateModal> createState() => _UpdateModalState();

lib/widgets/version_warning_modal.dart

@@ -5,9 +5,9 @@ class VersionWarningModal extends StatelessWidget {
   final String version;
 
   const VersionWarningModal({
-    Key? key,
+    super.key,
     required this.version,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {