feat: add confirmation dialog for saving availabilities

packages/flutter_availability/lib/src/config/availability_translations.dart

@@ -26,6 +26,8 @@ class AvailabilityTranslations {
     required this.availabilityAddTemplateTitle,
     required this.availabilityTimeTitle,
     required this.availabilitiesTimeTitle,
+    required this.availabilityDialogConfirmTitle,
+    required this.availabilityDialogConfirmDescription,
     required this.templateScreenTitle,
     required this.dayTemplates,
     required this.weekTemplates,
@@ -75,6 +77,11 @@ class AvailabilityTranslations {
     this.availabilityAddTemplateTitle = "Add template to availability",
     this.availabilityTimeTitle = "Start and end time workday",
     this.availabilitiesTimeTitle = "Start and end time workdays",
+    this.availabilityDialogConfirmTitle =
+        "Are you sure you want to save the changes?",
+    this.availabilityDialogConfirmDescription =
+        "This will update your availabilities but you can always "
+            "change them later",
     this.overviewScreenTitle = "Availability",
     this.templateScreenTitle = "Templates",
     this.dayTemplates = "Day templates",
@@ -155,6 +162,12 @@ class AvailabilityTranslations {
   /// The title on the time selection section for adding multiple availabilities
   final String availabilitiesTimeTitle;
 
+  /// The title on the dialog for confirming the availability update
+  final String availabilityDialogConfirmTitle;
+
+  /// The description on the dialog for confirming the availability update
+  final String availabilityDialogConfirmDescription;
+
   /// The title on the template screen
   final String templateScreenTitle;
 

packages/flutter_availability/lib/src/ui/screens/availability_modification.dart

@@ -92,11 +92,22 @@ class _AvailabilitiesModificationScreenState
       widget.onExit();
     }
 
+    Future<void> onClickSave() async {
+      var confirmed = await options.confirmationDialogBuilder(
+        context,
+        title: translations.availabilityDialogConfirmTitle,
+        description: translations.availabilityDialogConfirmDescription,
+      );
+      if (confirmed ?? false) {
+        await onSave();
+      }
+    }
+
     var canSave =
         _clearAvailability || (_startTime != null && _endTime != null);
     var saveButton = options.primaryButtonBuilder(
       context,
-      canSave ? onSave : null,
+      canSave ? onClickSave : null,
       Text(translations.saveButton),
     );
 

packages/flutter_availability/lib/src/ui/widgets/default_confirmation_dialog.dart

@@ -58,6 +58,7 @@ class DefaultConfirmationDialog extends StatelessWidget {
           Text(
             title,
             style: textTheme.titleMedium,
+            textAlign: TextAlign.center,
           ),
           const SizedBox(height: 16),
           Text(