on /files the viewer is NOT part of the file browser. `useFileViewerPanels` lives on
the SCREEN and swaps the whole workspace layout when `?view=` appears, opening a
viewer panel beside the browser. a plugin renders its own defaultLayout and has no
such hook — so double-clicking a file in this panel set `?view=` and nothing on earth
read it.
which means it never worked here. it LOOKED like it did for one deploy, because
`urlPath` was navigating to /files, where that screen did the work — so the bug I
introduced and then removed is the only reason anybody saw a preview.
the panel reads `?view=` itself now and renders FileViewerView, which the platform
exports for exactly this. OVER the browser rather than beside it: this panel is one
column of a two-column screen, and splitting it again would give a preview the width
of a phone.
closing clears `view` and `viewRoot` and leaves `media` alone, so you land back in
the folder you were in rather than at the top.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>