fix: 修正 logo 中 N 和 G 字母造型

N 添加对角线笔画（█▄ █），G 添加内横杠（█ ▀█），
避免与 O 字母造型雷同。同步更新 ui.ts 中的硬编码 wordmark。

packages/opencode/test/server/sdk-error-shape.test.ts

@@ -0,0 +1,81 @@
+/**
+ * Regression tests for the SDK error shape — the v2 SDK's `throwOnError: true`
+ * path used to throw raw values (empty strings or POJOs from JSON-decoded
+ * error bodies). The TUI catches those and `e.message`/`e.stack` are
+ * undefined, so users see `[object Object]` or a blank crash.
+ *
+ * Both cases must throw a real `Error` instance with a non-empty `.message`
+ * extracted from the response body, plus `.status` and `.body` attached.
+ */
+import { afterEach, describe, expect, test } from "bun:test"
+import { createOpencodeClient } from "@opencode-ai/sdk/v2"
+import { Server } from "../../src/server/server"
+import { disposeAllInstances, tmpdir } from "../fixture/fixture"
+import { resetDatabase } from "../fixture/db"
+
+afterEach(async () => {
+  await disposeAllInstances()
+  await resetDatabase()
+})
+
+function client(directory: string) {
+  return createOpencodeClient({
+    baseUrl: "http://test",
+    directory,
+    fetch: ((req: Request) => Server.Default().app.fetch(req)) as unknown as typeof fetch,
+  })
+}
+
+describe("v2 SDK error shape", () => {
+  test("404 with NamedError body throws a real Error carrying the server message", async () => {
+    await using tmp = await tmpdir({ git: true, config: { formatter: false, lsp: false } })
+    const sdk = client(tmp.path)
+
+    let caught: unknown
+    try {
+      await sdk.session.get({ sessionID: "ses_no_such" }, { throwOnError: true })
+    } catch (e) {
+      caught = e
+    }
+
+    expect(caught).toBeInstanceOf(Error)
+    const err = caught as Error
+    const cause = err.cause as { body?: any; status?: number }
+    expect(err.message).toContain("Session not found")
+    expect(cause.status).toBe(404)
+    expect(cause.body).toMatchObject({
+      name: "NotFoundError",
+      data: { message: expect.stringContaining("Session not found") },
+    })
+  })
+
+  test("400 schema rejection: SDK extracts the field-level reason from the NamedError body", async () => {
+    // Canary for the #26631 wire shape. Asserts the contract end-to-end:
+    // server emits {name:"BadRequest", data:{message, kind}}, SDK's
+    // wrapClientError extracts .data.message into Error.message. If either
+    // side regresses (#26457 reverted because both layers were missing),
+    // this test fails before users see (empty response body).
+    await using tmp = await tmpdir({ config: { formatter: false, lsp: false } })
+    const sdk = client(tmp.path)
+
+    let caught: unknown
+    try {
+      await sdk.sync.history.list({ body: { aggregate: -1 } as any }, { throwOnError: true })
+    } catch (e) {
+      caught = e
+    }
+
+    expect(caught).toBeInstanceOf(Error)
+    const err = caught as Error
+    const cause = err.cause as { body?: any; status?: number }
+    expect(cause.status).toBe(400)
+    expect(cause.body).toMatchObject({
+      name: "BadRequest",
+      data: { kind: expect.stringMatching(/^(Body|Payload)$/) },
+    })
+    expect(typeof cause.body.data.message).toBe("string")
+    expect(cause.body.data.message.length).toBeGreaterThan(0)
+    // Whatever the server put in data.message must be what the user sees.
+    expect(err.message).toBe(cause.body.data.message)
+  })
+})