chore: migrate to qt tray for all platforms (#5260)

cmake/packaging/macos.cmake

@@ -22,6 +22,26 @@ else()
         BUNDLE DESTINATION .
         COMPONENT Runtime)
 
+    if(SUNSHINE_ENABLE_TRAY)
+        # Import Qt in this directory so its deployment commands and targets are visible here.
+        set(_sunshine_module_path "${CMAKE_MODULE_PATH}")
+        find_package(Qt6 REQUIRED COMPONENTS Core)
+        set(CMAKE_MODULE_PATH "${_sunshine_module_path}")
+        unset(_sunshine_module_path)
+
+        qt6_generate_deploy_script(
+            TARGET sunshine
+            OUTPUT_SCRIPT SUNSHINE_QT_DEPLOY_SCRIPT
+            CONTENT "
+qt6_deploy_runtime_dependencies(
+    EXECUTABLE \"$<TARGET_FILE_NAME:sunshine>.app\"
+    NO_APP_STORE_COMPLIANCE
+    NO_TRANSLATIONS
+    DEPLOY_TOOL_OPTIONS -no-codesign
+)")
+        install(SCRIPT "${SUNSHINE_QT_DEPLOY_SCRIPT}" COMPONENT Runtime)
+    endif()
+
     install(FILES "${APPLE_PLIST_FILE}"
             DESTINATION "${MAC_BUNDLE_CONTENTS}"
             COMPONENT Runtime)
@@ -44,6 +64,18 @@ else()
         message(STATUS \"Running fixup_bundle for: \${_app}\")
         include(BundleUtilities)
         set(BU_CHMOD_BUNDLE_ITEMS TRUE)
+
+        # Resolve @rpath items that Qt already deployed into the app bundle.
+        function(gp_resolve_item_override context item exepath dirs resolved_item_var resolved_var)
+          if(\"\${item}\" MATCHES \"^@rpath/(.+)$\")
+            set(_embedded_item \"\${_app}/Contents/Frameworks/\${CMAKE_MATCH_1}\")
+            if(EXISTS \"\${_embedded_item}\")
+              set(\${resolved_item_var} \"\${_embedded_item}\" PARENT_SCOPE)
+              set(\${resolved_var} TRUE PARENT_SCOPE)
+            endif()
+          endif()
+        endfunction()
+
         fixup_bundle(\"\${_app}\" \"\" \"\")
 
         # Remove Finder/resource-fork metadata that breaks codesign.
@@ -61,12 +93,13 @@ else()
 
         # SHOULD_SIGN is set only when publish_release is true or when manually building
         if(\"\$ENV{SHOULD_SIGN}\" STREQUAL \"true\")
-          # Sign anything inside Contents/Frameworks
+          # Sign bundled frameworks and plugins before signing the app itself.
           set(_fw_dir \"\${_app}/Contents/Frameworks\")
           if(EXISTS \"\${_fw_dir}\")
               file(GLOB_RECURSE _sign_items
                   \"\${_fw_dir}/*.framework\"
                   \"\${_fw_dir}/*.dylib\"
+                  \"\${_app}/Contents/PlugIns/*.dylib\"
               )
 
               foreach(item IN LISTS _sign_items)