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/prompt/part.test.ts

@@ -0,0 +1,53 @@
+import { describe, expect, test } from "bun:test"
+import { expandTrackedPastedText, stripPromptPartIDs } from "../../src/prompt/part"
+
+describe("prompt part", () => {
+  test("strips persisted IDs from reused parts", () => {
+    expect(
+      stripPromptPartIDs({
+        id: "prt_old",
+        sessionID: "ses_old",
+        messageID: "msg_old",
+        type: "file" as const,
+        mime: "image/png",
+        filename: "tiny.png",
+        url: "data:image/png;base64,abc",
+      }),
+    ).toEqual({
+      type: "file",
+      mime: "image/png",
+      filename: "tiny.png",
+      url: "data:image/png;base64,abc",
+    })
+  })
+
+  test("preserves wide characters around pasted text", () => {
+    const marker = "[Pasted ~3 lines]"
+    const prefix = "你好你好\n"
+
+    expect(
+      expandTrackedPastedText(prefix + marker + "\n阿斯顿法国红酒看来", [
+        {
+          start: Bun.stringWidth("你好你好") + 1,
+          end: Bun.stringWidth("你好你好") + 1 + Bun.stringWidth(marker),
+          text: "public:\n\tvoid ExecuteTask();\nprivate:",
+        },
+      ]),
+    ).toBe("你好你好\npublic:\n\tvoid ExecuteTask();\nprivate:\n阿斯顿法国红酒看来")
+  })
+
+  test("only expands the tracked placeholder occurrence", () => {
+    const marker = "[Pasted ~3 lines]"
+    const prefix = `keep ${marker} then `
+
+    expect(
+      expandTrackedPastedText(prefix + marker + " tail", [
+        {
+          start: Bun.stringWidth(prefix),
+          end: Bun.stringWidth(prefix + marker),
+          text: "alpha\nbeta\ngamma",
+        },
+      ]),
+    ).toBe(`keep ${marker} then alpha\nbeta\ngamma tail`)
+  })
+})