fix(min-app-react): add missing useMainButton export

Author: evermake

packages/mini-app-react/src/index.ts

@@ -1,7 +1,9 @@
 export type { MiniApp } from './context.ts'
 export { MiniAppContext } from './context.ts'
-export { useBackButton } from './hooks/useBackButton.ts'
 export type { UseBackButtonOptions } from './hooks/useBackButton.ts'
+export { useBackButton } from './hooks/useBackButton.ts'
+export type { UseMainButtonOptions } from './hooks/useMainButton.ts'
+export { useMainButton } from './hooks/useMainButton.ts'
 export { useMiniApp } from './hooks/useMiniApp.ts'
 export type { UseSettingsButtonOptions } from './hooks/useSettingsButton.ts'
 export { useSettingsButton } from './hooks/useSettingsButton.ts'