fix(dock): harden blocking paths and fashion plugins

Fix blocking path handling in the dock stack.
Harden fashion mode plugin behavior for edge cases and invalid inputs.

Author: shule1987

panels/dock/CMakeLists.txt

@@ -168,6 +168,7 @@ qt_generate_wayland_protocol_server_sources(dock-plugin
 
 target_link_libraries(dock-plugin PUBLIC
     Qt${QT_VERSION_MAJOR}::Core
+    Qt${QT_VERSION_MAJOR}::Concurrent
     Qt${QT_VERSION_MAJOR}::DBus
     Qt${QT_VERSION_MAJOR}::Gui
     Qt${QT_VERSION_MAJOR}::Network