style(CourseDetailPage): 调整联系人列表样式，增大文字和二维码尺寸

将联系人姓名和电话的文字大小从sm调整为base，二维码尺寸从w-5 h-5增大到w-10 h-10

@@ -354,19 +354,19 @@
                 <ul class="mt-2 divide-y divide-gray-200">
                     <li v-for="(c, idx) in consult_contacts" :key="idx" class="flex items-center justify-between py-2">
                         <div class="flex items-center">
-                            <a class="text-gray-800 text-sm mr-3" :href="`tel:${c.phone}`" @click.prevent="call_phone(c.phone)">{{ c.name }}</a>
+                            <a class="text-gray-800 text-base mr-3" :href="`tel:${c.phone}`" @click.prevent="call_phone(c.phone)">{{ c.name }}</a>
                             <img
                                 v-if="c?.qrcode"
                                 :src="build_og_image_url(c.qrcode)"
                                 alt="联系人二维码"
-                                class="w-5 h-5 object-contain rounded cursor-pointer"
+                                class="w-10 h-10 object-contain rounded cursor-pointer"
                                 @click="open_contact_qr_preview(c.qrcode)"
                             />
                         </div>
-                        <a class="text-green-600 text-sm" :href="`tel:${c.phone}`" @click.prevent="call_phone(c.phone)">{{ c.phone }}</a>
+                        <a class="text-green-600 text-base" :href="`tel:${c.phone}`" @click.prevent="call_phone(c.phone)">{{ c.phone }}</a>
                     </li>
                 </ul>
-                <div class="text-xs text-gray-500 mt-2">点击二维码可查看大图</div>
+                <div class="text-xs text-gray-500 mt-2">点击图片可查看大图</div>
             </div>
 
             <!-- 底部关闭按钮（唯一操作） -->