fix: improve layout and responsive design

Layout fixes:
- Add min-height to page-content for better sticky footer
- Add max-height and overflow to sidebar for better scrolling
- Add min-height to content area
- Enhance responsive design for mobile devices

Image fixes:
- Remove missing image reference in canvas-functions.md

Author: loveTsong

assets/css/style.css

@@ -62,6 +62,7 @@ body {
 .page-content {
   padding: 32px 0;
   flex: 1;
+  min-height: calc(100vh - 200px);
 }
 
 .page-content .wrapper {
@@ -75,6 +76,8 @@ body {
   flex-shrink: 0;
   position: sticky;
   top: 32px;
+  max-height: calc(100vh - 64px);
+  overflow-y: auto;
 }
 
 .content {
@@ -84,6 +87,7 @@ body {
   padding: 24px;
   border-radius: 6px;
   box-shadow: 0 1px 3px rgba(0,0,0,0.12);
+  min-height: 400px;
 }
 
 .content h1 {

docs/zh_CN/workflow/canvas-functions.md

@@ -20,7 +20,7 @@ nav_order: 4
 
 紧挨着手型图标右侧的是 **节点整理功能** 按钮。点击后，系统将根据流程执行顺序自动对节点进行排布整理，使流程结构更规整、更清晰，方便用户快速理解和查看整体逻辑走向，尤其在流程较复杂时尤为实用。
 
-![整理效果](../assets/images/画布-整理效果.png)
+<!-- 整理效果截图 -->
 
 ## 页面自适应与缩放