The bottom filmstrip duplicated the rail's slides tab, so it is deleted
outright; its board-listing model survives as deck_boards, which both the
rail and the presenter keep using. The slides tab itself goes permanent —
any page with boards lists them, not just tagged deck documents — and rows
get a fixed-height box that letterboxes each board on its own aspect, so
phone screens and dashboards line up instead of stretching the column.
The tab row measures its labels and drops to icons (active tab keeps its
label) when the text genuinely cannot fit, sized by real overflow rather
than a width threshold so a third tab enables it everywhere for free.
Making the tab permanent would also have detonated a latent resize bug:
the rail's hover tier claimed every in-rail cursor move with no exemption
for a live drag, so a resize could widen the rail but never narrow it.
Panel-resize now runs ahead of the hover tiers as pointer capture, and the
web ladder learns native's z-order for an open model picker over the rail.
Claude-Session: https://claude.ai/code/session_01FqKQqNj8exYwopGDpYUU7x
b22c3c43e9