adds Cells to Smartsheet

[smar-kaloyan-gangov]

Pull Request

Description

Add Cells class to Smartsheet class for IDE autocomplete support. This change makes the Cells API accessible with proper type hints, enabling code completion in IDEs when accessing smart.Cells methods.

Related Issue

Fixes #121

Type of Change

• Bug fix
• New feature
• Documentation update
• Code refactoring
• Other (please describe):

Environment Information

• Smartsheet API Version: 2.0
• Smartsheet Python SDK Version: 3.7.2
• Python Version: 3.7+

What Changes Were Made

1. Added from .cells import Cells import in smartsheet/smartsheet.py
2. Added Cells: Cells type annotation to the Smartsheet class
3. Updated CHANGELOG.md with the new feature

Why These Changes Were Made

The Cells class was previously only accessible via the dynamic __getattr__ method, which meant IDEs couldn't provide autocomplete for Cells methods like get_cell_history() and add_image_to_cell(). By
adding explicit import and type annotation, developers now get proper IDE support, matching the pattern used for all other API resource classes (Sheets, Attachments, Contacts, etc.).

Testing

• Ran existing test suite: python -m pytest tests/
• Ran pylint: pylint smartsheet/smartsheet.py
• Local test: added the local version to a python project that now I can see the Cell class from the LSP

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have updated the relevant files in docs-source/ (no updates needed - autodoc handles this automatically)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (no new tests needed - this is a type annotation change)
• New and existing unit tests pass locally with my changes

Additional Notes

N/A

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