wrap the today page in the shared header + container/stack shell,
render scheduled nodes as cards via list-cards, and add a muted
empty-state message that toggles when no nodes are scheduled.
existing #scheduled-nodes-list and li selectors used by cypress
tests are preserved (the empty message lives in its own element).
apply the new design system to the home page: wrap content in a
container/stack shell with a site-header for the logout and today
links, render the texts list as a vertical stack of cards via the
list-cards primitive, and dress the create plan modal with the new
modal/btn classes. js renders each text as an li.card with the
create-plan button preserved so existing cypress hooks (li,
.create-plan, .plan-name, .save-plan, .cancel-plan, ids) keep
matching.
