Drop Qt Quick Controls and Qt Widgets

The binary now links Core, Gui, Quick and QuickShapes, nothing else.

Qt Widgets was there for one reason, QSystemTrayIcon, so the tray icon is gone
and QApplication is back to QGuiApplication. The cat itself is the whole
interface: right-click or long-press opens the settings window, which carries
the tricks and a quit button. Ctrl+C in the terminal works as well.

The settings window is rebuilt from Qt Quick primitives. AppButton, AppSlider,
AppToggle and SettingsGroup replace the Controls types, keyboard handling and
accessible roles included, and a Flickable with plain positioners replaces
QtQuick.Layouts.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CMakeLists.txt

@@ -8,13 +8,13 @@ project(TNCat
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-find_package(Qt6 6.5 REQUIRED COMPONENTS Core Gui Quick QuickControls2 Widgets)
+# No Qt Quick Controls and no Qt Widgets: the whole interface is plain Qt Quick.
+find_package(Qt6 6.5 REQUIRED COMPONENTS Core Gui Quick QuickShapes)
 qt_standard_project_setup(REQUIRES 6.5)
 
 qt_add_executable(tncat
     src/main.cpp
     src/catcontroller.h src/catcontroller.cpp
-    src/traycontroller.h src/traycontroller.cpp
     src/appsettings.h src/appsettings.cpp
     src/platforminfo.h src/platforminfo.cpp
 )
@@ -22,7 +22,8 @@ qt_add_executable(tncat
 target_include_directories(tncat PRIVATE src)
 
 # QML files live in qml/ but register at the module root (TNCat.Main etc.)
-set(TNCAT_QML Main Cat Chip Cup CatWindow ChipWindow CupWindow OverlayWindow SettingsWindow CatDefs)
+set(TNCAT_QML Main Cat Chip Cup CatWindow ChipWindow CupWindow OverlayWindow
+               SettingsWindow AppButton AppSlider AppToggle SettingsGroup CatDefs)
 foreach(qmlfile IN LISTS TNCAT_QML)
     set_source_files_properties(qml/${qmlfile}.qml PROPERTIES QT_RESOURCE_ALIAS ${qmlfile}.qml)
     list(APPEND TNCAT_QML_FILES qml/${qmlfile}.qml)
@@ -37,7 +38,7 @@ qt_add_qml_module(tncat
 )
 
 target_link_libraries(tncat PRIVATE
-    Qt6::Core Qt6::Gui Qt6::Quick Qt6::QuickControls2 Qt6::Widgets)
+    Qt6::Core Qt6::Gui Qt6::Quick Qt6::QuickShapes)
 
 set_target_properties(tncat PROPERTIES
     MACOSX_BUNDLE TRUE