feat(dogfood-wave1): Studio retries, Chat error, LLM gateway, kill snapshot, topbar cleanup (#14)

src/lib/wizardApi.ts

@@ -103,17 +103,23 @@ export const wizardApi = {
    */
   async applyBatch(_flowKey: string, ops: BatchOp[], _actor: Actor | null, signal?: AbortSignal) {
     if (!ops.length) return { applied: 0 };
-    const res = await fetch(`${api.config.baseUrl}/api/ea2/apply-batch`, {
-      method: "POST",
-      headers: authHeaders(),
-      body: JSON.stringify({ request_id: newRequestId(), ops }),
-      signal,
-    });
-    if (!res.ok) {
+    const body = JSON.stringify({ request_id: newRequestId(), ops });
+    const transient = new Set([502, 503, 504]);
+    let lastErr = "";
+    for (let attempt = 0; attempt < 3; attempt++) {
+      const res = await fetch(`${api.config.baseUrl}/api/ea2/apply-batch`, {
+        method: "POST",
+        headers: authHeaders(),
+        body,
+        signal,
+      });
+      if (res.ok) return res.json();
       const detail = await res.text().catch(() => "");
-      throw new Error(`applyBatch ${res.status}: ${detail.slice(0, 200)}`);
+      lastErr = `applyBatch ${res.status}: ${detail.slice(0, 200)}`;
+      if (!transient.has(res.status)) break;
+      await new Promise((r) => setTimeout(r, 400 * (attempt + 1)));
     }
-    return res.json();
+    throw new Error(lastErr || "applyBatch failed");
   },
 
   async startInstance(process_definition_id: string, business_subject?: string, signal?: AbortSignal) {