CLAUDE: GenericJTabbedDialog - don't stretch checkboxes (fix accidental toggle)

Checkboxes were laid out with fill=HORIZONTAL, stretching the (text-less) JCheckBox across the half-width cell so its click target reached the scrollbar - a near-scrollbar miss-click silently toggled them (this flipped 'DNN remote' off mid-session). Anchor checkboxes WEST at natural size; the rest of the cell is now dead space. Applies to all tabbed dialogs.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/main/java/com/elphel/imagej/common/GenericJTabbedDialog.java

@@ -315,7 +315,13 @@ public class GenericJTabbedDialog implements ActionListener {
 					label.setHorizontalAlignment(JLabel.RIGHT);
 	            	tab.add(label,gbc);
 	        		gbc.gridx = 1;
-	        		tab.add(component,gbc);
+	        		if (component instanceof JCheckBox) { // don't stretch checkboxes - keep the click target at the box, not the whole half-width cell (a near-scrollbar click was toggling them) // By Claude on 06/20/2026
+	        			gbc.fill = GridBagConstraints.NONE; gbc.anchor = GridBagConstraints.WEST;
+	        			tab.add(component,gbc);
+	        			gbc.fill = GridBagConstraints.HORIZONTAL; gbc.anchor = GridBagConstraints.CENTER; // restore for the following rows
+	        		} else {
+	        			tab.add(component,gbc);
+	        		}
 				}
 			}
 			// Add empty label that would push up all other rows