[变更性质] feat(frontend)

[新增功能] round5 主题基线重置：shadcn preset b6t6C6CTw CLI init、app.css 仅保留 tailwind + shadcn 主题变量层
[实现方案] 删除 round3 自定义 token/布局原语/legacy 别名；theme.ts 删除；mobileCss 守门测试重写
[影响范围] src/app.css、components.json、lib/utils.ts、lib/theme.ts、测试

1 files changed, 0 insertions, 28 deletions

diff --git a/frontend/src/lib/theme.ts b/frontend/src/lib/theme.ts
deleted file mode 100644
index ad949a4..0000000
--- a/frontend/src/lib/theme.ts
+++ /dev/null
@@ -1,28 +0,0 @@
-// 主题切换（round3）：默认 mint；.theme-amber 类挂 <html> 切到 amber 变量组。
-// 两套 token 都是 app.css 里的 CSS 变量组，本模块只负责持久化与挂类。
-
-export type BrandTheme = 'mint' | 'amber';
-const KEY = 'sl-brand-theme';
-
-export function currentTheme(): BrandTheme {
-  if (typeof document === 'undefined' || typeof localStorage === 'undefined') return 'mint';
-  const stored = localStorage.getItem(KEY);
-  return stored === 'amber' ? 'amber' : 'mint';
-}
-
-export function applyTheme(t: BrandTheme): void {
-  if (typeof document === 'undefined') return;
-  if (t === 'amber') document.documentElement.classList.add('theme-amber');
-  else document.documentElement.classList.remove('theme-amber');
-  if (typeof localStorage !== 'undefined') localStorage.setItem(KEY, t);
-}
-
-export function toggleTheme(): BrandTheme {
-  const next: BrandTheme = currentTheme() === 'mint' ? 'amber' : 'mint';
-  applyTheme(next);
-  return next;
-}
-
-if (typeof document !== 'undefined') {
-  applyTheme(currentTheme());
-}