1.0 library + player settings: Jellyfin/Link/Files library with details panel, player gear, settings cards, host flag

Library: source switch, selectable cards with a details panel, one merged
Continue row, Latest grouped per series without re-releases, Link page with
previews and recent links, Files embedded. Player: gear popover in both
designs, progress line while controls hide, live hwdec. Settings rebuilt as
cards. State marks the host member (proto stays 9, unreleased); hosting
shows LAN invite addresses; window buttons in fullscreen. fadeThrough keeps
the outgoing view's state.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/desktop/lib/src/shell/motion.dart

@@ -35,12 +35,14 @@ Widget fadeThrough(Widget child, {Key? key}) => AnimatedSwitcher(
           );
         }
         // Outgoing (anim 1 -> 0): fully faded by the time it reaches 0.65.
+        // Same widget shape as the incoming branch, or the old view would
+        // remount (and lose its state) while it fades.
         return FadeTransition(
           opacity: CurvedAnimation(
             parent: anim,
             curve: const Interval(1 - fadeOutPart, 1, curve: Curves.easeIn),
           ),
-          child: c,
+          child: ScaleTransition(scale: const AlwaysStoppedAnimation(1.0), child: c),
         );
       },
       child: child,