Add fallback for non-consolidated zarr stores

- Try consolidated=True first
- Fall back to consolidated=False if no .zmetadata
- Should now work with dynamical.org stores

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

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

app.py

@@ -62,9 +62,15 @@ def load_dataset(dataset_name, use_cache=True):
         logger.info(f"Opening zarr store at: {url}")
 
         # Open zarr store (using zarr v2)
-        logger.info("Opening with consolidated=True")
-        ds = xr.open_zarr(url, consolidated=True)
-        logger.info(f"Successfully opened zarr store")
+        # Try consolidated first, then fall back to non-consolidated
+        try:
+            logger.info("Trying to open with consolidated=True")
+            ds = xr.open_zarr(url, consolidated=True)
+            logger.info(f"Successfully opened with consolidated metadata")
+        except KeyError:
+            logger.info("No consolidated metadata, trying consolidated=False")
+            ds = xr.open_zarr(url, consolidated=False)
+            logger.info(f"Successfully opened without consolidated metadata")
         logger.info(f"Dataset dimensions: {dict(ds.dims)}")
         logger.info(f"Dataset variables: {list(ds.data_vars)}")
         logger.info(f"Dataset coordinates: {list(ds.coords)}")