jellyfin panel app: browse, detail and player

adds the /jellyfin screen and its two panels (nav + view) on top of the
jellyfin sidecar, following the photos/invoiceshelf shape.

the transcode path is a progressive mp4 rather than hls, so no hls.js
dependency is added under the frozen-install rule. that stream has no
length and no byte ranges, so the player owns its own scrubber and seeks
by re-negotiating at a new startTimeTicks, tracking offset + currentTime;
a direct file keeps native controls. the hls url is still returned, so
switching later is a player change only.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/apps/officer-web/state/usePageTitle.ts

@@ -19,6 +19,7 @@ const RULES: TitleRule[] = [
   { match: (p) => p.startsWith('/contacts'), title: 'Contacts' },
   { match: (p) => p.startsWith('/music'), title: 'Music' },
   { match: (p) => p.startsWith('/photos'), title: 'Photos' },
+  { match: (p) => p.startsWith('/jellyfin'), title: 'Video' },
   { match: (p) => p.startsWith('/soulseek'), title: 'Soulseek' },
   { match: (p) => p.startsWith('/headscale'), title: 'Headscale' },
   { match: (p) => p.startsWith('/transmission'), title: 'Transmission' },