- rename to MetaForge with updated branding

- redesign UI with modern card-based layout and tabs
- add social media preview functionality with OG and Twitter tags
- implement character counters with visual warnings for title/description length
- add search result preview with live updates
- create copy/download functionality for generated meta tags
- implement form data persistence using localStorage
- add syntax highlighting for generated HTML
- improve mobile responsiveness with media queries
- replace external script reference from `sidebar.js` to `logo.js`

Author: TobiasMue91