feat(jellyfin): add jellyfin-mpv-shim for high-quality casting

apps/jellyfin-mpv-shim/default.nix

@@ -0,0 +1,12 @@
+{pkgs, ...}: {
+  home.packages = with pkgs; [
+    jellyfin-mpv-shim
+  ];
+
+  wayland.windowManager.hyprland.settings.windowrulev2 = [
+    # --- JELLYFIN MPV SHIM ---
+    "float, class:^(jellyfin-mpv-shim)$"
+    "center, class:^(jellyfin-mpv-shim)$"
+    "size 70% 70%, class:^(jellyfin-mpv-shim)$"
+  ];
+}

modules/home/apps-optional.nix

@@ -5,5 +5,6 @@
     ../../apps/tickrs
     ../../apps/claude
     ../../apps/delfin
+    ../../apps/jellyfin-mpv-shim
   ];
 }