* refactor(z-index): introduce a shared named z-index scale
Replace scattered magic z-index numbers (100, 150, 200, 201, 250) with
named layers (z-app-bar, z-app-bar-elevated, z-modal, z-menu-elevated)
so intent is documented at each call site and future additions insert
predictably instead of colliding.
Defined via Tailwind's @utility directive in two places that mirror
each other: packages/ui/src/index.css (ui:-prefixed, for components
that live in the @cio/ui package) and apps/dashboard/src/app.css
(unprefixed, for dashboard-only files) — a ui:-prefixed custom utility
only compiles if it is also used somewhere under packages/ui/src, so
dashboard-only usages need the unprefixed twin.
Also fixes two pre-existing dropdown/select menus (tags-admin.svelte,
mark-exercise-modal.svelte) that used ui:z-[250], which never actually
compiled to any CSS rule since nothing under packages/ui/src used that
exact class.
Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>
* fix(ui): safelist the packaged z-index scale so it always compiles
@utility only emits a class when Tailwind's scanner sees that exact
candidate under packages/ui/src, so ui:z-app-bar-elevated and
ui:z-menu-elevated were documented but silently missing from the
compiled @cio/ui CSS since nothing inside the package itself used
them. Safelist all four layers via @source inline() so the shipped
scale always matches what's documented, regardless of which layers
this package happens to reference internally.
Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>
---------
Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>
