refactor: replace Toast with Sonner

frontend/app/features/platform/state/helpers.ts

@@ -8,7 +8,7 @@ import type {
   WorkspaceBoundApi,
 } from "~/services/api";
 
-import { useUiStore } from "./uiStore";
+import { toast } from "sonner";
 
 // 缓存的会话类型（多 iframe 共存方案）
 type CachedSession = {
@@ -173,7 +173,9 @@ export function pushToast(
   tone: "success" | "error" | "info",
   message: string,
 ): void {
-  useUiStore.getState().pushToast({ tone, message });
+  if (tone === "error") toast.error(message);
+  else if (tone === "info") toast.info(message);
+  else toast.success(message);
 }
 
 export async function sha256Hex(