fix: extend schedule sheet into bottom safe area

Author: jjoonleo

lib/presentation/schedule_create/components/keyboard_backed_bottom_sheet.dart

@@ -10,6 +10,7 @@ class KeyboardBackedBottomSheet extends StatelessWidget {
   });
 
   static const keyboardBackplateKey = Key('keyboard_backed_bottom_sheet_plate');
+  static const sheetKey = Key('keyboard_backed_bottom_sheet');
 
   final Widget child;
   final double heightFactor;
@@ -30,6 +31,7 @@ class KeyboardBackedBottomSheet extends StatelessWidget {
     return Material(
       color: Colors.transparent,
       child: SafeArea(
+        bottom: false,
         child: Stack(
           alignment: Alignment.bottomCenter,
           children: [
@@ -51,6 +53,7 @@ class KeyboardBackedBottomSheet extends StatelessWidget {
               child: FractionallySizedBox(
                 heightFactor: heightFactor,
                 child: Container(
+                  key: sheetKey,
                   decoration: BoxDecoration(
                     color: backgroundColor,
                     borderRadius: borderRadius,

test/presentation/schedule_create/components/keyboard_backed_bottom_sheet_test.dart

@@ -3,6 +3,28 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:on_time_front/presentation/schedule_create/components/keyboard_backed_bottom_sheet.dart';
 
 void main() {
+  testWidgets('fills the bottom safe area while keyboard is hidden', (
+    tester,
+  ) async {
+    tester.view.devicePixelRatio = 1;
+    tester.view.physicalSize = const Size(390, 844);
+    tester.view.padding = FakeViewPadding(bottom: 34);
+    addTearDown(tester.view.resetDevicePixelRatio);
+    addTearDown(tester.view.resetPhysicalSize);
+    addTearDown(tester.view.resetPadding);
+
+    await tester.pumpWidget(
+      const MaterialApp(
+        home: KeyboardBackedBottomSheet(child: SizedBox.expand()),
+      ),
+    );
+
+    expect(
+      tester.getBottomLeft(find.byKey(KeyboardBackedBottomSheet.sheetKey)).dy,
+      844,
+    );
+  });
+
   testWidgets('paints a white backplate behind the iOS keyboard inset', (
     tester,
   ) async {