fix(console): parse provider SSE error bodies

packages/console/app/test/providerError.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, test } from "bun:test"
+import { parseProviderErrorBody } from "../src/routes/zen/util/providerError"
+
+describe("provider error parsing", () => {
+  test("parses SSE error bodies from upstream rate limits", () => {
+    expect(
+      parseProviderErrorBody(
+        'event:error\ndata: {"error":{"type":"rate_limit_error","message":"Too many requests"}}\n\n',
+        "Too Many Requests",
+      ),
+    ).toEqual({
+      error: {
+        type: "rate_limit_error",
+        message: "Too many requests",
+      },
+    })
+  })
+
+  test("wraps plain text errors in provider error shape", () => {
+    expect(parseProviderErrorBody("overloaded", "Too Many Requests")).toEqual({
+      error: {
+        message: "overloaded",
+      },
+    })
+  })
+})