* feat: add user locale preference to user_preferences table
- Introduced a new column 'locale' in the user_preferences table to store per-user UI language preferences.
- Added a CHECK constraint to ensure only supported locales ('sv', 'en') are allowed.
- Triggered a schema reload notification for the changes.
chore: declare CSS module support in TypeScript
- Added a declaration for CSS modules in globals.d.ts to enable TypeScript support for importing CSS files.
* feat: add Swish as an invoice payment method in company settings
Broad update across dashboard pages, components, extensions, and lib code. Includes ESLint config additions, onboarding flow redesign, settings page refactor, help page content expansion, dead code removal, and test mock fixes. Adds dev docs and public assets.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>