ci: pass bumped version and post-bump ref to docs jobs in release flow

[vdusek]

Summary

The v3.0.0 release versioned the docs as 2.5 instead of 3.0 (overwriting v2.5 content with v3). Root cause: manual_version_docs.yaml reads uv version --short from a checkout of the workflow's dispatch ref (pre-bump), so the job sees the old version. Run #26156928273 logged Version: 2.5.1, Major.Minor: 2.5, Major: 2; bad output is commit e0a0bc8.

Fix

• manual_version_docs.yaml — optional version_number input; snapshot step uses it when set, falls back to uv version --short for manual dispatch.

Companion data-restore PR: #808.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.52%. Comparing base (80a5974) to head (d15cec6).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #806      +/-   ##
==========================================
+ Coverage   94.50%   94.52%   +0.02%     
==========================================
  Files          48       48              
  Lines        4916     4916              
==========================================
+ Hits         4646     4647       +1     
+ Misses        270      269       -1     

Flag	Coverage Δ
integration	90.82% <ø> (ø)
unit	83.03% <ø> (ø)

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