feat: complete QML shell migration and ship 0.0.8 Arch package

Replace the Widgets main shell with AppShellHost + QML routes, add a QML
independent player window, and remove the legacy player/page Widgets stack.
Also wire settings cache/proxy actions, fix quit-time engine teardown, improve
list/home scroll performance, and update Arch packaging to 0.0.8.

cmake/QEmbyPackaging.cmake

@@ -9,7 +9,7 @@ if(UNIX AND NOT APPLE)
             "${CMAKE_INSTALL_LIBDIR}/${QEMBY_RUNTIME_LIB_SUBDIR}")
     endif()
 
-    foreach(_qemby_runtime_target IN ITEMS qEmbyApp qEmbyCore QWKCore QWKWidgets)
+    foreach(_qemby_runtime_target IN ITEMS qEmbyApp qEmbyCore QWKCore QWKWidgets QWKQuick)
         if(TARGET "${_qemby_runtime_target}")
             set_target_properties("${_qemby_runtime_target}" PROPERTIES
                 INSTALL_RPATH "$ORIGIN"
@@ -18,7 +18,7 @@ if(UNIX AND NOT APPLE)
     endforeach()
 
     set(_qemby_qwk_install_targets)
-    foreach(_qemby_qwk_target IN ITEMS QWKCore QWKWidgets)
+    foreach(_qemby_qwk_target IN ITEMS QWKCore QWKWidgets QWKQuick)
         if(TARGET "${_qemby_qwk_target}")
             list(APPEND _qemby_qwk_install_targets "${_qemby_qwk_target}")
         endif()