fix: 修复 form-item 元素宽度被挤压问题

src/components/firstui/fui-form-item/fui-form-item.vue

@@ -261,12 +261,14 @@
 	/* #ifndef APP-NVUE */
 	.fui-form__item-sizing {
 		box-sizing: border-box;
+        flex-shrink: 0;
 	}
 
 	/* #endif */
 
 	.fui-form__item-content {
 		flex: 1;
+        width: 0;
 	}
 
 	.fui-form__item-bottom {