Use os.path.join for path construction in metadata_builder

[Copilot]

Description of the Changes You Made

Replaced string concatenation with os.path.join() for file path construction in metadata_builder.py to match the pattern used in overlap_detection.py.

Changes:

• Added import os
• Line 127 (split zarr): os.path.join(row['zarr_base_path'], row['file_path'], str(self.level))
• Line 129 (non-split zarr): os.path.join(self.image_file_prefix, row['file_path'], str(self.level))
• Line 131 (tiff): os.path.join(self.image_file_prefix, row['file_path'])

Before:

file_path = row['zarr_base_path'] + row['file_path'] + f'/{self.level}'

After:

file_path = os.path.join(row['zarr_base_path'], row['file_path'], str(self.level))

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Instructions for Testing

Run the metadata_builder unit tests:

python tests/test_detection/test_metadata_builder.py

Additional Info

This change improves cross-platform compatibility and makes path construction more robust. All existing tests pass.

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