enhancement: create new thread with last chosen model

[urmauur]

Describe Your Changes

This pull request includes a small but significant change to the useCreateNewThread hook in the web/hooks/useCreateNewThread.ts file. The change introduces the use of a selectedModel state value to prioritize the model selection process when creating a new thread.

Key change:

• web/hooks/useCreateNewThread.ts: Added selectedModel from the selectedModelAtom and updated the defaultModel assignment to prioritize selectedModel over recommendedModel when no specific model is provided.

Fixes Issues

Screen.Recording.2025-01-26.at.22.26.18.mov

• Closes enhancement: Jan should remember and default to user's last chosen model #4398
• Closes #

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed

[github-actions]

Barecheck - Code coverage report

Total: 67.96%

Your code coverage diff: 0.01% ▴

Uncovered files and lines

File	Lines
web/hooks/useCreateNewThread.ts	139-140, 142-143, 150-151, 162, 171, 208, 212, 214

[github-actions]

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