* Upgrade ESLint and related configurations to version 9
- Update ESLint to version 9.19.0
- Migrate ESLint configurations to flat config format
- Remove deprecated ESLint config files
- Update package dependencies and configurations
- Simplify ESLint setup across packages
- Remove unnecessary ESLint config blocks from package.json files
- Improved CI caching with Turborepo tasks
- Removed duplicate styles
* Updated to TailwindCSS v4
* Moved CSS module to its own CSS file because of lightingcss strict validation
* Respect next parameter in middleware
* Updated all packages.
* Split CSSs for better organization.
* Redesigned theme and auth pages
* Improved pill and header design
* Formatted files using Prettier
* Better footer layout
* Better auth layout
* Bump version of the repository to 2.0.0
This commit removes the redundant `use-toast.tsx` file and refactors the authentication methods in `personal-accounts-server-actions.ts` to enhance service integration and data handling. UI components like `LanguageDropdownSwitcher` and `site-header-account-section.tsx` have been refined for better readability. Changes in the `config.tsx` file aim to improve the overall code cleanliness. The `schema.sql` file under migrations was updated to cascade delete for 'invited_by' reference.
