feat(web): ui upgrade

web/src/assets/images/conversation/expand.svg

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="16px" height="16px" viewBox="0 0 16 16" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <title>编组 36</title>
+    <g id="空间里层页面优化" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round">
+        <g id="多模态对话-3" transform="translate(-763, -266)" stroke="#171719" stroke-width="1.2">
+            <g id="编组-34" transform="translate(540, 248)">
+                <g id="编组-33" transform="translate(218, 13)">
+                    <g id="编组-36" transform="translate(5, 5)">
+                        <path d="M9.02271937,3 L13,3 L13,7.07419434 M6.96571644,13 L3,13 L3,9.04391117" id="形状"></path>
+                    </g>
+                </g>
+            </g>
+        </g>
+    </g>
+</svg>