修改

public/index.html

@@ -15,7 +15,7 @@
         <input type="file" id="file-input" accept="image/jpeg,image/png,.jpg,.jpeg,.png" hidden>
       </label>
       <div class="mode-group" role="group" aria-label="标注模式">
-        <button type="button" class="btn mode-btn active" data-mode="entry">入场</button>
+        <button type="button" class="btn mode-btn" data-mode="entry">入场</button>
         <button type="button" class="btn mode-btn" data-mode="exit">出场</button>
         <button type="button" class="btn mode-btn" data-mode="stop">止损</button>
       </div>
@@ -72,7 +72,7 @@
     <span>入场 <i class="legend entry"></i></span>
     <span>出场 <i class="legend exit"></i></span>
     <span>止损 <i class="legend stop"></i></span>
-    <span class="footer-note">滚轮缩放 · 右键拖动画布 · 方向面板/滑块设置箭头朝向</span>
+    <span class="footer-note">空白处拖动平移 · 选中类型后单击放置（各仅一个）</span>
   </footer>
 
   <script src="js/app.js"></script>