修复了2个bug

app/globals.css

@@ -4256,7 +4256,10 @@ h3 {
   gap: 10px;
   margin-bottom: 12px;
   padding: 12px;
-  overflow: auto;
+  overflow-x: hidden;
+  overflow-y: auto;
+  overscroll-behavior: contain;
+  scrollbar-gutter: stable;
   border: 1px solid #c8d9d5;
   border-radius: 12px;
   background: #f6faf9;
@@ -4420,12 +4423,14 @@ h3 {
 }
 
 .seedream-canvas-viewport {
-  min-height: clamp(320px, 46vh, 560px);
-  flex: 1 1 auto;
+  --seedream-canvas-height: clamp(280px, 38vh, 460px);
+  width: 100%;
+  height: var(--seedream-canvas-height);
+  min-height: 0;
+  flex: 0 0 auto;
   display: grid;
   place-items: center;
-  overflow: auto;
-  overscroll-behavior: contain;
+  overflow: hidden;
   padding: 10px;
   border: 1px solid var(--line);
   border-radius: 10px;
@@ -4450,7 +4455,7 @@ h3 {
 .seedream-canvas-stage > img {
   width: auto;
   max-width: 100%;
-  max-height: clamp(300px, 44vh, 540px);
+  max-height: calc(var(--seedream-canvas-height) - 22px);
   display: block;
   user-select: none;
 }
@@ -5551,7 +5556,7 @@ h3 {
   }
 
   .seedream-canvas-viewport {
-    min-height: 260px;
+    --seedream-canvas-height: clamp(240px, 42vh, 320px);
     padding: 6px;
   }