feat: add bottom safe area of content for Modal Sheets' (#243)

CHANGELOG.md

@@ -14,6 +14,7 @@ It is expected that you keep this format strictly, since we depend on it in our
 
 ### Changed
 - Dropped support for `Flutter SDK 3.19.6`: minimum supported version is 3.22.3
+- `showSBBModalSheet` & `showCustomSBBModalSheet`: add bottom safe area of content if `useSafeArea` is true
 
 ### Deprecated
 - `SBBIconFormButton`

lib/src/modal/sbb_modal.dart

@@ -108,10 +108,9 @@ Future<T?> showSBBModalSheet<T>({
     enableDrag: enableDrag,
     constraints: constraints,
     builder: (BuildContext context) {
-      return SBBModalSheet(
-        title: title,
-        child: child,
-      );
+      return useSafeArea
+          ? _wrapWithBottomSafeArea(SBBModalSheet(title: title, child: child))
+          : SBBModalSheet(title: title, child: child);
     },
     barrierColor: SBBInternal.barrierColor,
   );
@@ -149,10 +148,9 @@ Future<T?> showCustomSBBModalSheet<T>({
     enableDrag: enableDrag,
     constraints: constraints,
     builder: (BuildContext context) {
-      return SBBModalSheet.custom(
-        header: header,
-        child: child,
-      );
+      return useSafeArea
+          ? _wrapWithBottomSafeArea(SBBModalSheet.custom(header: header, child: child))
+          : SBBModalSheet.custom(header: header, child: child);
     },
     barrierColor: SBBInternal.barrierColor,
   );
@@ -306,3 +304,12 @@ class _CloseButton extends StatelessWidget {
         ),
       );
 }
+
+Widget _wrapWithBottomSafeArea(Widget child) {
+  return SafeArea(
+    top: false,
+    left: false,
+    right: false,
+    child: child,
+  );
+}