feat: simplify WorkflowNodeCard and WorkflowNodeIcon by removing tone handling and unused imports

web/app/dashboard/ai-workflows/_components/workflow-node-icon.tsx

@@ -1,31 +1,23 @@
 import { cn } from "@/lib/utils"
-import {
-  getWorkflowNodeIconClass,
-  getWorkflowNodeMeta,
-  type WorkflowNodeTone,
-} from "./workflow-node-meta"
+import { getWorkflowNodeMeta } from "./workflow-node-meta"
 
 export function WorkflowNodeIcon({
   type,
-  tone,
   size = "md",
   className,
 }: {
   type: string
-  tone?: WorkflowNodeTone
   size?: "sm" | "md"
   className?: string
 }) {
   const meta = getWorkflowNodeMeta(type)
   const Icon = meta.icon
-  const resolvedTone = tone ?? meta.tone
 
   return (
     <span
       className={cn(
-        "flex shrink-0 items-center justify-center rounded-lg shadow-sm",
+        "flex shrink-0 items-center justify-center rounded-lg bg-muted text-muted-foreground shadow-sm",
         size === "md" ? "size-7" : "size-6",
-        getWorkflowNodeIconClass(resolvedTone),
         className
       )}
     >