Fix View button tooltip to remove napari reference

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: hongquanli

gui/app.py

@@ -1067,7 +1067,7 @@ def setup_ui(self):
         self.view_flatfield_button.setCursor(Qt.PointingHandCursor)
         self.view_flatfield_button.clicked.connect(self.view_flatfield)
         self.view_flatfield_button.setEnabled(False)
-        self.view_flatfield_button.setToolTip("View flatfield and darkfield in napari")
+        self.view_flatfield_button.setToolTip("View flatfield and darkfield")
         self.view_flatfield_button.setFixedWidth(60)
         status_layout.addWidget(self.view_flatfield_button)