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/lib/test-provider.ts

@@ -0,0 +1,37 @@
+// Shared provider config for tests that need opencode to talk to a fake LLM
+// over a real HTTP endpoint. Registers a single provider `test` with a single
+// model `test-model` (i.e. `--model test/test-model`), pointed at the URL the
+// caller supplies (typically a TestLLMServer instance).
+//
+// Used by:
+//   - test/lib/run-process.ts          (subprocess CLI tests)
+//   - test/server/httpapi-sdk.test.ts  (in-process SDK tests)
+export function testProviderConfig(llmUrl: string) {
+  return {
+    formatter: false,
+    lsp: false,
+    provider: {
+      test: {
+        name: "Test",
+        id: "test",
+        env: [],
+        npm: "@ai-sdk/openai-compatible",
+        models: {
+          "test-model": {
+            id: "test-model",
+            name: "Test Model",
+            attachment: false,
+            reasoning: false,
+            temperature: false,
+            tool_call: true,
+            release_date: "2025-01-01",
+            limit: { context: 100_000, output: 10_000 },
+            cost: { input: 0, output: 0 },
+            options: {},
+          },
+        },
+        options: { apiKey: "test-key", baseURL: llmUrl },
+      },
+    },
+  }
+}