fix(ui): restore scroll on question dock for long plan content

Author: BYK

packages/ui/src/components/dock-surface.css

@@ -4,7 +4,7 @@
   position: relative;
   z-index: 10;
   border-radius: 12px;
-  overflow: clip;
+  overflow: hidden;
 }
 
 [data-dock-surface="tray"] {

packages/ui/src/components/message-part.css

@@ -909,6 +909,8 @@
     gap: 4px;
     flex: 1;
     min-height: 0;
+    overflow-y: auto;
+    max-height: calc(var(--question-prompt-max-height, 70dvh) - 140px);
   }
 
   [data-slot="question-text"] {
@@ -935,15 +937,6 @@
     gap: 6px;
     margin-top: 12px;
     padding: 1px 1px 8px;
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: none;
-    -ms-overflow-style: none;
-
-    &::-webkit-scrollbar {
-      display: none;
-    }
   }
 
   [data-slot="question-option"] {