style: 统一管理设置页中日期选择器的输入框样式

src/routes/admin/settings/+page.svelte

@@ -389,6 +389,22 @@
 		box-shadow: 0 0 0 2px rgba(65, 155, 56, 0.1);
 	}
 
+	/* 抹除浏览器原生日期选择器的特殊样式，保持与项目其他输入框一致 */
+	.form-group input[type='date'] {
+		appearance: none;
+		-webkit-appearance: none;
+		width: 100%;
+		box-sizing: border-box;
+		color-scheme: light;
+	}
+
+	.form-group input[type='date']::-webkit-calendar-picker-indicator {
+		filter: invert(0.4);
+		cursor: pointer;
+		padding: 0;
+		margin-left: 4px;
+	}
+
 	.form-actions {
 		margin-top: 10px;
 		display: flex;