Bump dependency floors and add ipywidgets to doc group

[Marius1311]

What

• Modernize declared dependency floors to reflect the versions actually used/tested:
  • openai >=1.90 → >=2 (was a full major version behind its floor)
  • anthropic >=0.59 → >=0.75
  • google-genai >=1.27 → >=1.57
  • squidpy >=1.6 → >=1.7
  • scanpy >=1.11 → >=1.11.5
  • rapids-singlecell >=0.12 → >=0.13
  • colorspacious >=1.1 → >=1.1.2
• Add ipywidgets to the doc group so Jupyter/notebook tqdm progress bars render (otherwise tqdm warns IProgress not found), mirroring the cellmapper setup.

Notes

• No installed versions change (already above the new floors) — only the declared constraints.
• uv.lock is intentionally not committed (gitignored in this repo).

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.76%. Comparing base (9258b17) to head (ff9c8f8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #83      +/-   ##
==========================================
+ Coverage   84.54%   84.76%   +0.21%     
==========================================
  Files          15       15              
  Lines        1372     1372              
==========================================
+ Hits         1160     1163       +3     
+ Misses        212      209       -3     

see 1 file with indirect coverage changes

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