Function createMiniAppButton

createMiniAppButton(options: MiniAppButtonOptions): TelegramInlineKeyboardButton
Creates an inline keyboard button that launches a Mini App.

Optional coordination hints are encoded into the launch URL so later flow layers can recover them without widening the Telegram button shape.
Parameters
- options: MiniAppButtonOptions
Returns TelegramInlineKeyboardButton
Example
```
const button = createMiniAppButton({
  text: "Open Task Shop",
  webAppUrl: "https://example.ngrok.app",
  startPayload: "signed-flow"
});
```