Enable tiled_vae to prevent OOM on portrait images

Also add async polling to HTML test page for long-running jobs.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

workflows/Wan22-I2V-Remix-API.json

@@ -362,7 +362,7 @@
       "end_latent_strength": 1,
       "force_offload": true,
       "fun_or_fl2v_model": false,
-      "tiled_vae": false,
+      "tiled_vae": true,
       "augment_empty_frames": 0,
       "vae": [
         "157",