Display battery status on the extension icon and popup page, and support custom notifications.
State of the extension icon: ● Green color: power level > 15%, Red color: power level <= 15% ● ⚡️flag: charging or fully charged, without ⚡️flag: not charged ● The battery icon itself reflects the overall power level ● Hover over the icon to display battery percentage
The popup page displays detailed information, and you can set whether to show battery percentage on the extension icon.
