Remove widget from client (DO NOT MERGE - NEED DEPRECATION FIRST)

[ItamarGoldman]

Summary

As part of the work in refactoring the client, removing the widget from the client.

Implementation Checklist

• Remove client/qiskit_serverless/visualization/ directory
• Remove widget() method from BaseClient
• Check if ipywidgets dependency can be removed from requirements
• Add to release notes as breaking change
• Run full test suite to ensure no hidden dependencies

Details and comments

Files to Remove

1. Widget Module Files

• client/qiskit_serverless/visualization/widget.py - Main widget implementation
• client/qiskit_serverless/visualization/__init__.py - Module initialization
• client/qiskit_serverless/visualization/ - Entire directory can be removed

Files to Update

1. BaseClient Class

File: client/qiskit_serverless/core/client.py:191-198

Action: Delete lines 187-198 (entire widget section)

Impact Assessment

✅ No Impact Areas

1. Main Package API - client/qiskit_serverless/__init__.py

   • Widget is NOT exported in the main package
   • No changes needed to package imports

2. Documentation - docs/

   • No documentation references to widget found
   • No .rst files mention widget or visualization

3. Tests - client/tests/

   • No test files reference widget or visualization
   • No test coverage to remove

4. Dependencies

   • Widget uses ipywidgets but this is likely already a dependency
   • Check requirements.txt or setup.py to see if ipywidgets can be removed