Fix settings/plugin window bugs; remove example plugin

- Add missing QGroupBox import to settings_window (caused silent crash on open)
- Remove Controls tab and _controls_tab() method from settings
- Clamp child window positions to screen bounds so they don't go off-screen on Windows when main window is maximized
- Apply same screen-clamp fix to Motion Capture plugin window
- Delete example plugin; disable it in enabled.json

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/plugins/motion_capture/plugin.py b/plugins/motion_capture/plugin.py
index e5d37c7..1c655c5 100644
--- a/plugins/motion_capture/plugin.py
+++ b/plugins/motion_capture/plugin.py
@@ -166,9 +166,16 @@ class MotionCapturePlugin(LabPlugin):
                 self._win.set_px_per_mm(state.get("px_per_mm", 10.0))
 
         if checked:
-            geo = self._ctx.main_window.geometry()
             if not self._win.isVisible():
-                self._win.move(geo.right() + 8, geo.top() + 40)
+                from PyQt6.QtWidgets import QApplication
+                mw = self._ctx.main_window
+                screen = QApplication.screenAt(mw.geometry().center()) or QApplication.primaryScreen()
+                avail = screen.availableGeometry()
+                geo = mw.normalGeometry()
+                self._win.adjustSize()
+                x = max(avail.left(), min(geo.right() + 8, avail.right()  - self._win.width()))
+                y = max(avail.top(),  min(geo.top()  + 40, avail.bottom() - self._win.height()))
+                self._win.move(x, y)
             self._win.show()
             self._win.raise_()
         else: