fix: prevent user from going back during PIN set flow

src/screens/Settings/PIN/AskForBiometrics.tsx

@@ -65,14 +65,21 @@ const AskForBiometrics = ({
 
 	const onSkip = (): void => {
 		const bioType = biometryData?.biometryType ?? 'Biometrics';
-		navigation.navigate('Result', { bio: false, type: bioType });
+		// use navigation.reset to prevent user from going back to previous screen
+		navigation.reset({
+			index: 0,
+			routes: [{ name: 'Result', params: { bio: false, type: bioType } }],
+		});
 	};
 
 	const onContinue = useCallback((): void => {
 		const bioType = biometryData?.biometryType ?? 'Biometrics';
 
 		if (!biometryData?.available || !shouldEnableBiometrics) {
-			navigation.navigate('Result', { bio: false, type: bioType });
+			navigation.reset({
+				index: 0,
+				routes: [{ name: 'Result', params: { bio: false, type: bioType } }],
+			});
 			return;
 		}
 
@@ -81,7 +88,10 @@ const AskForBiometrics = ({
 			.then(({ success }) => {
 				if (success) {
 					dispatch(updateSettings({ biometrics: true }));
-					navigation.navigate('Result', { bio: true, type: bioType });
+					navigation.reset({
+						index: 0,
+						routes: [{ name: 'Result', params: { bio: true, type: bioType } }],
+					});
 				}
 			})
 			.catch(() => {
@@ -103,7 +113,10 @@ const AskForBiometrics = ({
 
 	return (
 		<GradientView style={styles.root}>
-			<BottomSheetNavigationHeader title={biometricsName} />
+			<BottomSheetNavigationHeader
+				title={biometricsName}
+				displayBackButton={false}
+			/>
 
 			<View style={styles.content}>
 				{!biometryData && <BodyM color="white50">{t('bio_loading')}</BodyM>}

src/screens/Settings/PIN/ChoosePIN.tsx

@@ -65,7 +65,11 @@ const ChoosePIN = ({
 			if (pinsAreEqual) {
 				addPin(pin);
 				dispatch(hideTodo(pinTodo.id));
-				navigation.navigate('AskForBiometrics');
+				// replace the navigation stack to avoid going back to the PIN screen
+				navigation.reset({
+					index: 0,
+					routes: [{ name: 'AskForBiometrics' }],
+				});
 			} else {
 				vibrate({ type: 'notificationWarning' });
 				setPin('');