Fix playback, API races, tray, MPRIS, and search UX; add tests

- Correct history/resume next-previous context and list index resync after reload
- Abort stale RadioBrowser requests and suppress error banners when cache satisfies loads
- Reset local search filter on page changes and debounce compact-mode API search
- Move system tray to C++ (QSystemTrayIcon) for reliable Wayland context menus
- Harden MPRIS registration and metadata updates for Plasma media widgets
- Add playback and API race unit tests
- Drop unused KF6 Kirigami, I18n, and CoreAddons build dependencies
- Update packaging docs, CI, and PKGBUILD to match Qt-only requirements

src/CMakeLists.txt

@@ -12,6 +12,7 @@ set(SOURCES
     bearwavecontroladaptor.cpp
     notificationmanager.cpp
     icyreader.cpp
+    systemtraymanager.cpp
 )
 
 # Create executable
@@ -45,9 +46,6 @@ target_link_libraries(bearwave PRIVATE
     Qt6::QuickControls2
     Qt6::Widgets
     Qt6::Multimedia
-    KF6::Kirigami
-    KF6::I18n
-    KF6::CoreAddons
 )
 
 # Install