feat: add More link in sample camera help overlay opening F1 dialog

Underlined 'More… (F1)' line at the bottom of the painted help box emits
open_full_help, wired to the existing Mouse / Keyboard Controls dialog.

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

src/aare/gui/main_window.py

@@ -913,6 +913,7 @@ class MainWindow(QMainWindow):
         self.sample_camera.smargon.connect(self.daq.move_smargon)
         self.beamline.smargon_panel.smargon.connect(self.daq.move_smargon)
         self.sample_camera.samcam_updated.connect(self.daq.samcam_settings)
+        self.sample_camera.open_full_help.connect(self.show_controls_help)
 
         self.raster.omega.connect(self.daq.set_omega)
         self.raster.smargon.connect(self.daq.move_smargon)

src/aare/gui/widgets/camera_image.py

@@ -98,6 +98,8 @@ class SampleCameraImageLabel(QGraphicsView):
     samcam_updated = Signal(SampleCameraSettings)
 
     switch_raster_grid = Signal()
+    # "More…" link in the help overlay; main window opens the full F1 dialog.
+    open_full_help = Signal()
 
     def __init__(
         self,
@@ -147,6 +149,7 @@ class SampleCameraImageLabel(QGraphicsView):
         # legend visibility is already handled by the panel checkboxes.
         self._help_expanded = False
         self._help_hit_rect: QRectF | None = None  # viewport coords, set on paint
+        self._help_more_rect: QRectF | None = None  # "More…" link inside the overlay
         self._target_point = None
         self._target_shape = None
         self._target_color_name = "Cyan"
@@ -471,6 +474,19 @@ class SampleCameraImageLabel(QGraphicsView):
         self._scaling()
 
     def mousePressEvent(self, event):
+        # "More…" link before the box toggle: its rect lies inside the help box,
+        # so the toggle below would swallow the click otherwise.
+        if (
+            event.button() == Qt.MouseButton.LeftButton
+            and self._help_more_rect is not None
+            and self._help_more_rect.contains(QPointF(self.viewport().mapFrom(self, event.pos())))
+        ):
+            self._help_expanded = False
+            self.update()
+            self.open_full_help.emit()
+            event.accept()
+            return
+
         # Help badge first: pure UI affordance, must work even when camera
         # interaction is disabled (session overlay etc.).
         if (
@@ -1087,6 +1103,7 @@ class SampleCameraImageLabel(QGraphicsView):
 
     def _draw_help_overlay(self, painter: QPainter):
         self._help_hit_rect = None
+        self._help_more_rect = None
         if not self._help_expanded:
             self._draw_help_badge(painter)
             return
@@ -1114,8 +1131,15 @@ class SampleCameraImageLabel(QGraphicsView):
             for entry in entries:
                 max_width = max(max_width, fm.horizontalAdvance(entry))
 
+        more_text = "More…  (F1)"
+        max_width = max(max_width, fm.horizontalAdvance(more_text))
+
         width = max_width + padding * 2
-        height = len(self._HELP_SECTIONS) * header_height + n_lines * line_height + padding * 2
+        height = (
+            len(self._HELP_SECTIONS) * header_height
+            + (n_lines + 1) * line_height  # +1: trailing "More…" link line
+            + padding * 2
+        )
 
         bg_rect = QRectF(18, max(18, self.viewport().height() - height - 18), width, height)
         self._help_hit_rect = bg_rect  # click anywhere on the box to close
@@ -1135,6 +1159,19 @@ class SampleCameraImageLabel(QGraphicsView):
                 painter.drawText(QPointF(bg_rect.left() + padding, y + fm.ascent()), entry)
                 y += line_height
 
+        # Trailing link to the full F1 dialog; underlined so it reads as clickable.
+        link_font = QFont(font)
+        link_font.setUnderline(True)
+        painter.setFont(link_font)
+        painter.setPen(QPen(qcolor(LEGEND_TEXT), 1))
+        painter.drawText(QPointF(bg_rect.left() + padding, y + fm.ascent()), more_text)
+        self._help_more_rect = QRectF(
+            bg_rect.left() + padding,
+            y,
+            fm.horizontalAdvance(more_text),
+            line_height,
+        )
+
         painter.restore()
 
     def _draw_overlay_legend(self, painter: QPainter):