Fix: Add pandas to notebooks dependencies

[harikapadia999]

Description

Fixes #151 - Resolves ModuleNotFoundError: No module named 'pandas' when running sam3_image_predictor_example.ipynb

Problem

The example notebook sam3_image_predictor_example.ipynb requires pandas but it was only listed in the dev optional dependencies, not in notebooks dependencies. Users installing with pip install -e ".[notebooks]" would encounter an import error.

Solution

Added pandas to the notebooks optional dependencies in pyproject.toml

Testing

• Verified pandas is now included in notebooks dependencies
• Change is minimal and non-breaking
• Aligns with existing dev dependencies that already include pandas

Checklist

• Fixes reported issue ModuleNotFoundError: No module named 'pandas' #151
• Minimal change (single line addition)
• No breaking changes
• Follows existing dependency structure

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[drduhe]

Not for you to address in this PR - but I am wondering if we may want to start pinning versions for the dependencies here.