Fix ContactsTest blocking and VideoPlaybackTest EDT hang

1. `ContactsTest`: Added `Display.getInstance().isContactsPermissionGranted()` check to fast-fail if permissions are missing. Added a 5-second safety timer to terminate the test if the native `getContacts` call blocks indefinitely (e.g. on a permission dialog). This addresses the user's concern about the test suite hanging on Android while attempting to cover the Contacts feature.
2. `VideoPlaybackTest`: Switched from the blocking `MediaManager.createMedia` (which hangs the EDT on network access) to `MediaManager.createMediaAsync`. This prevents the "timeout waiting for DONE" error.
3. Both tests now override `shouldTakeScreenshot()` to false to avoid flakiness associated with async states.

Author: google-labs-jules[bot]

scripts/hellocodenameone/common/src/main/java/com/codenameone/examples/hellocodenameone/tests/VideoPlaybackTest.java

@@ -24,27 +24,34 @@ public boolean runTest() throws Exception {
         form.add(BorderLayout.NORTH, status);
         form.show();
 
+        // Use createMediaAsync to avoid blocking the EDT (which causes timeouts)
         try {
-            Media video = MediaManager.createMedia(VIDEO_URL, true, null);
-            if (video != null) {
-                video.setNativePlayerMode(false); // Try to embed if possible
-                form.add(BorderLayout.CENTER, video.getVideoComponent());
-                status.setText("Playing video...");
-                form.revalidate();
-                video.play();
-            } else {
-                status.setText("Failed to create media (null).");
-                form.revalidate();
-            }
+            MediaManager.createMediaAsync(VIDEO_URL, true, () -> {
+                // On completion of playback (optional, we just want to start it)
+            }).ready(media -> {
+                if (media != null) {
+                    media.setNativePlayerMode(false); // Try to embed if possible
+                    form.add(BorderLayout.CENTER, media.getVideoComponent());
+                    status.setText("Playing video...");
+                    form.revalidate();
+                    media.play();
+                } else {
+                    status.setText("Failed to create media (null).");
+                    form.revalidate();
+                }
+                // Wait a bit for playback to start, then finish.
+                UITimer.timer(2000, false, form, () -> done());
+            }).except(err -> {
+                 status.setText("Error creating media: " + err.getMessage());
+                 form.revalidate();
+                 done();
+            });
         } catch (Exception e) {
             status.setText("Error: " + e.getMessage());
             e.printStackTrace();
+            done();
         }
 
-        // Wait a bit for playback to start/fail, then finish.
-        // We do not wait for the video to finish as it is a playback test, not a completion test.
-        UITimer.timer(2000, false, form, () -> done());
-
         return true;
     }
 }