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/sdk/js/example/example.ts

@@ -0,0 +1,56 @@
+import { createOpencodeClient, createOpencodeServer } from "@opencode-ai/sdk"
+import { pathToFileURL } from "bun"
+
+const server = await createOpencodeServer()
+const client = createOpencodeClient({ baseUrl: server.url })
+
+const input = await Array.fromAsync(new Bun.Glob("packages/core/*.ts").scan())
+
+const tasks: Promise<void>[] = []
+for await (const file of input) {
+  console.log("processing", file)
+  const session = await client.session.create()
+  tasks.push(
+    client.session.prompt({
+      path: { id: session.data.id },
+      body: {
+        parts: [
+          {
+            type: "file",
+            mime: "text/plain",
+            url: pathToFileURL(file).href,
+          },
+          {
+            type: "text",
+            text: `Write tests for every public function in this file.`,
+          },
+        ],
+      },
+    }),
+  )
+  console.log("done", file)
+}
+
+await Promise.all(
+  input.map(async (file) => {
+    const session = await client.session.create()
+    console.log("processing", file)
+    await client.session.prompt({
+      path: { id: session.data.id },
+      body: {
+        parts: [
+          {
+            type: "file",
+            mime: "text/plain",
+            url: pathToFileURL(file).href,
+          },
+          {
+            type: "text",
+            text: `Write tests for every public function in this file.`,
+          },
+        ],
+      },
+    })
+    console.log("done", file)
+  }),
+)