feat(前端界面): 优化配置空态与焦点样式

assets/webui/ofdgo.css

@@ -1769,6 +1769,10 @@ body[data-hide-meta] .meta-panel {
 	overflow: hidden;
 }
 
+.settings-dialog :focus-visible {
+	outline-offset: -2px;
+}
+
 .settings-dialog > form {
 	display: flex;
 	flex-direction: column;