fix(model): validate default model against available options

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/copilot/copilot.tsx

@@ -131,8 +131,10 @@ export const Copilot = forwardRef<CopilotRef, CopilotProps>(({ panelWidth }, ref
     resumeActiveStream,
   })
 
-  // Handle scroll management
-  const { scrollAreaRef, scrollToBottom } = useScrollManagement(messages, isSendingMessage)
+  // Handle scroll management (80px stickiness for copilot)
+  const { scrollAreaRef, scrollToBottom } = useScrollManagement(messages, isSendingMessage, {
+    stickinessThreshold: 40,
+  })
 
   // Handle chat history grouping
   const { groupedChats, handleHistoryDropdownOpen: handleHistoryDropdownOpenHook } = useChatHistory(

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/hooks/use-scroll-management.ts

@@ -16,7 +16,7 @@ interface UseScrollManagementOptions {
   /**
    * Distance from bottom (in pixels) within which auto-scroll stays active
    * @remarks Lower values = less sticky (user can scroll away easier)
-   * @defaultValue 30
+   * @defaultValue 100
    */
   stickinessThreshold?: number
 }
@@ -41,7 +41,7 @@ export function useScrollManagement(
   const lastScrollTopRef = useRef(0)
 
   const scrollBehavior = options?.behavior ?? 'smooth'
-  const stickinessThreshold = options?.stickinessThreshold ?? 30
+  const stickinessThreshold = options?.stickinessThreshold ?? 100
 
   /** Scrolls the container to the bottom */
   const scrollToBottom = useCallback(() => {