Moves kanban, gantt, section components, chat hooks and extracted
EtapesSection/RoadmapSection from apps/main into the new shared
packages/tablo-views package. Components that previously depended on
app-specific providers (UserStoreProvider, useIsReadOnlyUser, etc.) are
refactored to receive data/callbacks as props, keeping the package free
of apps/main dependencies.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
