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/core/test/plugin/provider-cohere.test.ts

@@ -0,0 +1,86 @@
+import { describe, expect, mock } from "bun:test"
+import { Effect } from "effect"
+import { ModelV2 } from "@opencode-ai/core/model"
+import { PluginV2 } from "@opencode-ai/core/plugin"
+import { CoherePlugin } from "@opencode-ai/core/plugin/provider/cohere"
+import { fakeSelectorSdk, it, model } from "./provider-helper"
+
+const cohereOptions: Record<string, any>[] = []
+
+void mock.module("@ai-sdk/cohere", () => ({
+  createCohere: (options: Record<string, any>) => {
+    cohereOptions.push({ ...options })
+    return {
+      languageModel: (modelID: string) => ({
+        modelID,
+        provider: `${options.name ?? "cohere"}.chat`,
+        specificationVersion: "v3",
+      }),
+    }
+  },
+}))
+
+describe("CoherePlugin", () => {
+  it.effect("creates a Cohere SDK only for @ai-sdk/cohere", () =>
+    Effect.gen(function* () {
+      const plugin = yield* PluginV2.Service
+      yield* plugin.add(CoherePlugin)
+
+      const ignored = yield* plugin.trigger(
+        "aisdk.sdk",
+        { model: model("cohere", "command"), package: "@ai-sdk/openai-compatible", options: { name: "cohere" } },
+        {},
+      )
+      expect(ignored.sdk).toBeUndefined()
+
+      const result = yield* plugin.trigger(
+        "aisdk.sdk",
+        { model: model("cohere", "command"), package: "@ai-sdk/cohere", options: { name: "cohere" } },
+        {},
+      )
+      expect(result.sdk).toBeDefined()
+    }),
+  )
+
+  it.effect("uses the model provider ID as the bundled SDK name", () =>
+    Effect.gen(function* () {
+      const plugin = yield* PluginV2.Service
+      yield* plugin.add(CoherePlugin)
+      const result = yield* plugin.trigger(
+        "aisdk.sdk",
+        {
+          model: model("custom-cohere", "command-r-plus"),
+          package: "@ai-sdk/cohere",
+          options: { name: "custom-cohere", apiKey: "test", baseURL: "https://cohere.example" },
+        },
+        {},
+      )
+
+      expect(cohereOptions.at(-1)).toEqual({
+        name: "custom-cohere",
+        apiKey: "test",
+        baseURL: "https://cohere.example",
+      })
+      expect(result.sdk?.languageModel("command-r-plus").provider).toBe("custom-cohere.chat")
+    }),
+  )
+
+  it.effect("leaves language selection to the default languageModel fallback", () =>
+    Effect.gen(function* () {
+      const plugin = yield* PluginV2.Service
+      const calls: string[] = []
+      const sdk = fakeSelectorSdk(calls)
+      yield* plugin.add(CoherePlugin)
+      const result = yield* plugin.trigger(
+        "aisdk.language",
+        { model: model("cohere", "alias", { api: { id: ModelV2.ID.make("command-r-plus") } }), sdk, options: {} },
+        {},
+      )
+
+      expect(result.language).toBeUndefined()
+      expect(calls).toEqual([])
+      expect(result.language ?? sdk.languageModel("command-r-plus")).toBeDefined()
+      expect(calls).toEqual(["languageModel:command-r-plus"])
+    }),
+  )
+})