移除gitignore中的lib文件夹，上传被排除掉的前端lib文件

dashboard/src/lib/theme-context.ts

@@ -0,0 +1,15 @@
+import { createContext } from 'react'
+
+type Theme = 'dark' | 'light' | 'system'
+
+export type ThemeProviderState = {
+  theme: Theme
+  setTheme: (theme: Theme) => void
+}
+
+const initialState: ThemeProviderState = {
+  theme: 'system',
+  setTheme: () => null,
+}
+
+export const ThemeProviderContext = createContext<ThemeProviderState>(initialState)