fix: 修复评论区溢出和按钮颜色问题

- 修复评论区长文本溢出问题，添加 overflow-wrap 和 word-break 属性
- 修复评论内容区域文本溢出问题
- 修复移动端 TODO 验证码提交按钮颜色未跟随全局主题设置
- 统一按钮样式使用 btn-primary 类

style.css

@@ -5237,6 +5237,12 @@ html.darkmode .has-thumbnail .related-post-title.clamp {
 
 	width: calc(100% - 50px);
 
+	overflow-wrap: break-word;
+
+	word-wrap: break-word;
+
+	word-break: break-word;
+
 }
 
 #comments .comment-item:last-child .comment-item-inner {
@@ -5281,6 +5287,12 @@ html.darkmode .has-thumbnail .related-post-title.clamp {
 
 	margin-bottom: 1rem;
 
+	overflow-wrap: break-word;
+
+	word-wrap: break-word;
+
+	word-break: break-word;
+
 }
 
 .comment-name {