Fix channel display on tvOS - use full screen instead of modal popup

Changed MediaCoordinator routing from .modal to .push for tvOS to match native library behavior. All channels (Xtream VOD, Xtream Series, Live TV, etc.) now display in full-screen grid layout instead of a small centered modal window.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Shared/Coordinators/MediaCoordinator.swift

@@ -18,9 +18,9 @@ final class MediaCoordinator: NavigationCoordinatable {
     @Root
     var start = makeStart
     #if os(tvOS)
-    @Route(.modal)
+    @Route(.push)
     var library = makeLibrary
-    @Route(.modal)
+    @Route(.push)
     var liveTV = makeLiveTV
     #else
     @Route(.push)