fix live canvas clipping

src/main/java/eu/jonahbauer/raytracing/render/canvas/LiveCanvas.java

@@ -42,15 +42,19 @@ public final class LiveCanvas implements Canvas {
 
     public @NotNull Thread preview() {
         var frame = new JFrame();
-        frame.setSize(getWidth(), getHeight());
         frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
         frame.setContentPane(new JPanel() {
+            {
+                setPreferredSize(new Dimension(image.getWidth(), image.getHeight()));
+            }
+
             @Override
             protected void paintComponent(Graphics g) {
                 g.drawImage(image, 0, 0, null);
             }
         });
         frame.setResizable(false);
+        frame.pack();
         frame.setVisible(true);
 
         var update = Thread.ofVirtual().start(() -> {