fix(app): preserve auth token credentials (#25636)

packages/app/src/utils/server.test.ts

@@ -0,0 +1,23 @@
+import { describe, expect, test } from "bun:test"
+import { authFromToken, authTokenFromCredentials } from "./server"
+
+describe("authFromToken", () => {
+  test("decodes basic auth credentials from auth_token", () => {
+    expect(authFromToken(btoa("kit:secret"))).toEqual({ username: "kit", password: "secret" })
+  })
+
+  test("defaults blank username to opencode", () => {
+    expect(authFromToken(btoa(":secret"))).toEqual({ username: "opencode", password: "secret" })
+  })
+
+  test("ignores malformed tokens", () => {
+    expect(authFromToken("not base64")).toBeUndefined()
+    expect(authFromToken(btoa("missing-separator"))).toBeUndefined()
+  })
+})
+
+describe("authTokenFromCredentials", () => {
+  test("encodes credentials with the default username", () => {
+    expect(authTokenFromCredentials({ password: "secret" })).toBe(btoa("opencode:secret"))
+  })
+})