Added light / dark / system theme switching and refreshed the Xerox Zine Punk light-mode interface.

Version 1.2.0 adds usage history and configuration portability improvements.

• Added the Logs tab with enable, disable, install, and uninstall history.
• Added usage statistics for recent extension lifecycle events.
• Added import/export support for groups, rules, preferences, and usage logs.
• Improved popup state refresh and reliability around stored extension data.
• Kept all data local to the browser; no account or remote service is required.