Import the Finlio Mobile design: a fixed bottom tab bar
(Accueil/Plan/Suivi/Flux) replaces the duplicated links in the mobile
hamburger menu, and the dashboard gets a mobile-first layout — hero
"reste à dépenser" card, revenus/épargne tiles, and a spending-by-
category list with progress bars — built from the same $sections data
the desktop tables use. Desktop dashboard is untouched.
The hero card uses a fixed dark background (independent of the
light/dark token swap) so its white text holds contrast in both
themes, matching how the existing -fill tokens are documented.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
