- drop Bulma and Font Awesome, plain CSS built on charte.css
- dashboard: GitHub-like calendar grouped by year, selected day panel
(sticky side column on desktop, bottom bar on mobile), keyboard navigation
- public page: today's mood and last months fit in one screen, journal hidden
- day log page: mode picker as pills, illustration follows the chosen mode
- login, password and invitation screens in French, global flash messages
- add User#current_mode_since
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
