fix: preserve parent coordinate dtype in overview levels (#47)

TiTiler requires coordinate dtypes to match between parent and child
groups. Previously np.linspace() always returned float64, causing
alignment errors when parent coordinates were int64.

Now reads parent dtype and casts overview coordinates accordingly.

Fixes: group /measurements/reflectance/r10m/1 is not aligned error

Author: wietzesuijker

src/eopf_geozarr/conversion/geozarr.py

@@ -935,10 +935,14 @@ def create_overview_dataset_all_vars(
     # Calculate the transform for this overview level
     overview_transform = rasterio.transform.from_bounds(*native_bounds, width, height)
 
-    # Create coordinate arrays
+    # Determine coordinate dtype from parent dataset to maintain alignment
+    parent_x_dtype = ds.coords["x"].dtype if "x" in ds.coords else np.float64
+    parent_y_dtype = ds.coords["y"].dtype if "y" in ds.coords else np.float64
+
+    # Create coordinate arrays preserving parent dtype
     left, bottom, right, top = native_bounds
-    x_coords = np.linspace(left, right, width, endpoint=False)
-    y_coords = np.linspace(top, bottom, height, endpoint=False)
+    x_coords = np.linspace(left, right, width, endpoint=False, dtype=parent_x_dtype)
+    y_coords = np.linspace(top, bottom, height, endpoint=False, dtype=parent_y_dtype)
 
     # Check if we're dealing with geographic coordinates (EPSG:4326)
     if native_crs and native_crs.to_epsg() == 4326: