feat: pointing-hand cursor on all interactive widgets

QSS cannot set cursors and per-widget setCursor calls get forgotten as
widgets are added, so an app-level filter catches every Polish event on
buttons, combos, and sliders — dialogs and pop-outs included.

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

src/aare/gui/main_window.py

@@ -15,7 +15,7 @@ from aarecommon.models.models import (
     SessionsStateEnum,
     TokenData,
 )
-from PySide6.QtCore import QEvent, QPropertyAnimation, QSettings, Qt, QTimer, Signal, Slot
+from PySide6.QtCore import QEvent, QObject, QPropertyAnimation, QSettings, Qt, QTimer, Signal, Slot
 from PySide6.QtGui import (
     QAction,
     QActionGroup,
@@ -26,8 +26,10 @@ from PySide6.QtGui import (
     QPalette,
 )
 from PySide6.QtWidgets import (
+    QAbstractButton,
     QApplication,
     QCheckBox,
+    QComboBox,
     QDockWidget,
     QFrame,
     QGraphicsColorizeEffect,
@@ -39,6 +41,7 @@ from PySide6.QtWidgets import (
     QPushButton,
     QScrollArea,
     QSizePolicy,
+    QSlider,
     QStackedWidget,
     QTabWidget,
     QToolBar,
@@ -122,6 +125,22 @@ from aare.gui.widgets.wheel_value_guard import WheelValueGuard
 logger = setup_logger(LOGGER_NAME)
 
 
+class ClickableCursorFilter(QObject):
+    """App-wide pointing-hand cursor on every button/combo/slider, present
+    and future. QSS cannot set cursors, and per-widget setCursor calls are
+    forgotten whenever a new widget is added — the Polish event fires once
+    for each widget when its style is applied, so this catches them all.
+    Widgets that manage their own cursor afterwards (beamline state strip's
+    forbidden cursor) still win: they set it later."""
+
+    def eventFilter(self, obj, event):
+        if event.type() == QEvent.Type.Polish and isinstance(
+            obj, (QAbstractButton, QComboBox, QSlider)
+        ):
+            obj.setCursor(Qt.CursorShape.PointingHandCursor)
+        return False
+
+
 class MainWindow(QMainWindow):
     sample_geometry = Signal(SampleGeometryModel)
 
@@ -196,6 +215,10 @@ class MainWindow(QMainWindow):
         self._tutorial_text_resolver = DictionaryTextResolver(MANUAL_MOUNT_TUTORIAL)
         self.state_manager = UIStateManager("PSI", "AareGUI")
 
+        # App-level, not window-level: dialogs and pop-outs get it too.
+        self._clickable_cursor_filter = ClickableCursorFilter(self)
+        QApplication.instance().installEventFilter(self._clickable_cursor_filter)
+
         # Wheel safety: sliders/spin boxes/combos only react to the wheel
         # while the right mouse button is held; a bare wheel just scrolls
         # the page — it can never nudge a value or move a motor.