Fix F1 help focus issue in InterestPointExplorer

The F1 help key wasn't working until the user clicked on the table.
This commit fixes that by:

- Making the panel focusable with setFocusable(true)
- Adding mouse listeners to automatically request focus when:
  * Mouse enters the panel area
  * Mouse is pressed/clicked anywhere in the panel

Now F1 works immediately when you hover or click anywhere in the
InterestPointExplorer window, without requiring a table row click first.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: StephanPreibisch

src/main/java/net/preibisch/mvrecon/fiji/spimdata/explorer/interestpoint/InterestPointExplorerPanel.java

@@ -89,6 +89,10 @@ public InterestPointExplorerPanel( final ViewInterestPoints viewInterestPoints,
 		this.delete = new ArrayList< Pair< InterestPoints, ViewId > >();
 
 		this.viewSetupExplorer = viewSetupExplorer;
+
+		// Make the panel focusable to receive key events
+		setFocusable( true );
+
 		initComponent( viewInterestPoints );
 	}
 
@@ -440,6 +444,25 @@ public void mouseClicked(MouseEvent e)
 
 		addPopupMenu( table );
 		addHelpListener( table );
+
+		// Request focus on this panel when the mouse enters, so F1 works
+		this.addMouseListener( new MouseListener()
+		{
+			@Override
+			public void mouseReleased(MouseEvent e) {}
+
+			@Override
+			public void mousePressed(MouseEvent e) { requestFocusInWindow(); }
+
+			@Override
+			public void mouseExited(MouseEvent e) {}
+
+			@Override
+			public void mouseEntered(MouseEvent e) { requestFocusInWindow(); }
+
+			@Override
+			public void mouseClicked(MouseEvent e) {}
+		});
 	}
 
 	protected void addHelpListener( final JTable table )