feat: refine mobile master agent sync and chat rendering

tests/master-agent-model-options.test.ts

@@ -0,0 +1,17 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { getMasterAgentModelOptions } from "../src/lib/master-agent-model-options";
+
+test("主 Agent 模型选项会明确暴露快反和深思模型", () => {
+  assert.deepEqual(
+    getMasterAgentModelOptions(),
+    ["gpt-5.4-mini", "gpt-5.4", "gpt-5.1", "gpt-4.1"],
+  );
+});
+
+test("主 Agent 模型选项会保留当前自定义模型", () => {
+  assert.deepEqual(
+    getMasterAgentModelOptions("gpt-4.1-mini"),
+    ["gpt-4.1-mini", "gpt-5.4-mini", "gpt-5.4", "gpt-5.1", "gpt-4.1"],
+  );
+});