fix: bugs

db/db.go

@@ -56,7 +56,7 @@ func (c *Client) init() {
 	downloadDir := c.GetSetting(SettingDownloadDir)
 	if downloadDir == "" {
 		log.Infof("set default download dir")
-		c.SetSetting(downloadDir, "/downloads")
+		c.SetSetting(SettingDownloadDir, "/downloads")
 	}
 	logLevel := c.GetSetting(SettingLogLevel)
 	if logLevel == "" {

ui/lib/settings.dart

@@ -564,7 +564,7 @@ class _SystemSettingsPageState extends ConsumerState<SystemSettingsPage> {
                 "user": values["user"],
                 "password": values["password"],
                 "change_file_hash":
-                    values["change_file_hash"] as bool ? "true" : "false"
+                    (values["change_file_hash"]??false) as bool ? "true" : "false"
               },
             ));
       } else {

ui/lib/tv_details.dart

@@ -271,7 +271,7 @@ class _TvDetailsPageState extends ConsumerState<TvDetailsPage> {
                   data: (v) {
                     return SingleChildScrollView(
                         child: DataTable(
-                            dataTextStyle: TextStyle(fontSize: 12, height: 0),
+                            dataTextStyle: const TextStyle(fontSize: 12, height: 0),
                             columns: const [
                               DataColumn(label: Text("名称")),
                               DataColumn(label: Text("大小")),