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/tui/test/context/local.test.ts

@@ -0,0 +1,22 @@
+import { expect, test } from "bun:test"
+import { parseModel, recentModels } from "../../src/context/local"
+
+test("parses model IDs containing slashes", () => {
+  expect(parseModel("provider/family/model")).toEqual({
+    providerID: "provider",
+    modelID: "family/model",
+  })
+})
+
+test("moves a model to the front, deduplicates, and limits recents", () => {
+  const recent = Array.from({ length: 12 }, (_, index) => ({
+    providerID: "provider",
+    modelID: `model-${index}`,
+  }))
+
+  expect(recentModels({ providerID: "provider", modelID: "model-5" }, recent)).toEqual([
+    { providerID: "provider", modelID: "model-5" },
+    ...recent.slice(0, 5),
+    ...recent.slice(6, 10),
+  ])
+})