Fix globe rotation direction (west-to-east landmass drift) (#83)

Flip camera rotation sign so landmasses move in the natural
west-to-east direction. Re-captured 120-frame animation.

Fixes #78

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: rdhyee

assets/isamples_globe.webp

@@ -93,7 +93,7 @@ async def capture_globe(num_frames=120, duration_sec=15, output_path="/tmp/isamp
                 () => {{
                     window._viewer.scene.camera.rotate(
                         Cesium.Cartesian3.UNIT_Z,
-                        -{rotation_per_frame}
+                        {rotation_per_frame}
                     );
                 }}
             """)