fix finger gui cannot choose camera

examples/finger_pipeline.py

@@ -90,6 +90,7 @@ def main():
                     threshold=0.4,
                     grid_spacing=10,
                     arrow_scale=1.0,
+                    valid_mask=tactile.valid_mask,
                 )
                 cv2.imshow("UV Unrolled", arrows)
 

examples/gui/viewer3d/dashboard.py

@@ -570,6 +570,8 @@ class FingerDashboardWindow(QMainWindow):
         camera_id = str(camera_id).strip()
         if not camera_id:
             return
+        # Explicit camera pick clears sticky file mode and persists the live source.
+        self.settings_panel.set_video_source(camera_id)
         self.config.video = camera_id
         self._save_preferences()
         self._update_play_enabled_for_source()

examples/gui/viewer3d/widgets/settings_panel.py

@@ -110,6 +110,8 @@ class SettingsPanelWidget(QWidget):
         self.camera_combo = QComboBox()
         self.camera_combo.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed)
         self.camera_combo.setToolTip("Select an available camera")
+        # activated fires on user pick even when the index is unchanged (file → live override).
+        self.camera_combo.activated.connect(self._on_camera_combo_changed)
         self.camera_combo.currentIndexChanged.connect(self._on_camera_combo_changed)
         video_row.addWidget(self.camera_combo, 1)
         self.btn_refresh_cameras = QPushButton("Refresh")