- button.css: replaced with go-backend multi-class selector version + ghost variant rules
- badge.css: replaced with go-backend pill-shape version + primary variant
- card.css: replaced with go-backend token-based header/body/footer version
- card.templ: migrated from children passthrough to typed CardProps{Header/Body/Footer}
- ui_test.go: rewrote TestCard_RendersChildren -> TestCard_RendersTypedRegions; added TestBadge_PrimaryVariant; added textComponent helper + io import
- auth_login.templ, auth_signup.templ: migrated Card usage to typed CardProps API
- tablos.templ: migrated TabloCard to typed CardProps API with extracted tabloCardBody
- planning.templ, tasks.templ, events.templ, etapes.templ: all compound button class strings updated to multi-class pattern
- go test ./... passes (all packages green)
- just generate succeeds
