Настройки расширения

Добавить страницу с настройками, где можно изменить настройки расширения. Например, указать доски на которых работает расширение, изменить уровни громкости для вебм, и тд.

Start by mapping the browser extension's current board-detection and WEBM audio behavior before designing the settings page. Identify which board selections and volume levels need to be configurable, how settings should persist, and how to verify that changing them affects the extension. Done means the page supports the agreed options and those options are applied consistently.

Written by the indexing model from the issue text.