feat(ts): 实现 Polaris 可交互首页

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

ts/web/nextjs/polaris/src/features/navigation/lib/sidebar-preference.test.ts

@@ -0,0 +1,15 @@
+import { describe, expect, it } from "vitest"
+
+import { parseSidebarPreference } from "./sidebar-preference"
+
+describe("侧栏持久化值", () => {
+  it("解析显式布尔字符串", () => {
+    expect(parseSidebarPreference("true", false)).toBe(true)
+    expect(parseSidebarPreference("false", true)).toBe(false)
+  })
+
+  it("损坏或缺失值回退设置默认值", () => {
+    expect(parseSidebarPreference("collapsed", false)).toBe(false)
+    expect(parseSidebarPreference(null, true)).toBe(true)
+  })
+})