The sidebar now either shows fully (280px with labels, search, user
info) or is completely replaced by the mobile UI. The icon-only 72px
strip is eliminated — below 900px the mobile top bar, bottom nav,
drawer, and FAB take over entirely.
Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>
The mobile layout now activates the moment the left sidebar would need
to shrink — at 688px (72px sidebar + 600px feed + padding). Added a
custom `sidebar` Tailwind screen breakpoint and replaced all `md:`
references that control the sidebar/mobile toggle with `sidebar:`.
This ensures the bottom nav, top bar, drawer, FAB, and full-width feed
kick in precisely when the sidebar can no longer fit alongside the feed.
Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>
Alex Gleason