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/fixture/workspace.ts

@@ -0,0 +1,30 @@
+import { FetchHttpClient } from "effect/unstable/http"
+import { Layer } from "effect"
+import { Database } from "@opencode-ai/core/database/database"
+import { FSUtil } from "@opencode-ai/core/fs-util"
+import { Auth } from "../../src/auth"
+import { Workspace } from "../../src/control-plane/workspace"
+import { RuntimeFlags } from "../../src/effect/runtime-flags"
+import { InstanceBootstrap } from "../../src/project/bootstrap"
+import { InstanceStore } from "../../src/project/instance-store"
+import { Project } from "../../src/project/project"
+import { Vcs } from "../../src/project/vcs"
+import { Session } from "../../src/session/session"
+import { SessionPrompt } from "../../src/session/prompt"
+import { EventV2Bridge } from "../../src/event-v2-bridge"
+
+export const workspaceLayerWithRuntimeFlags = (overrides: Partial<RuntimeFlags.Info>) =>
+  Workspace.layer.pipe(
+    Layer.provide(Auth.defaultLayer),
+    Layer.provide(Session.defaultLayer),
+    Layer.provide(SessionPrompt.defaultLayer),
+    Layer.provide(Project.defaultLayer),
+    Layer.provide(Vcs.defaultLayer),
+    Layer.provide(Database.defaultLayer),
+    Layer.provide(EventV2Bridge.defaultLayer),
+    Layer.provide(FetchHttpClient.layer),
+    Layer.provide(FSUtil.defaultLayer),
+    Layer.provide(RuntimeFlags.layer(overrides)),
+    Layer.provide(InstanceStore.defaultLayer),
+    Layer.provide(InstanceBootstrap.defaultLayer),
+  )