[ENH]: Simplify Preprocess interface

[synchon]

• description of feature/fix
• tests added/passed
• add an entry for the latest changes

This PR refactors the Preprocess interface to simplify implementation logic.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.60%. Comparing base (0f459e2) to head (5b51d11).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #473      +/-   ##
==========================================
- Coverage   91.60%   91.60%   -0.01%     
==========================================
  Files         146      146              
  Lines        5956     5919      -37     
  Branches      951      950       -1     
==========================================
- Hits         5456     5422      -34     
+ Misses        324      321       -3     
  Partials      176      176              

Flag	Coverage Δ
docs	100.00% <ø> (ø)

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Files with missing lines	Coverage Δ
junifer/preprocess/_temporal_filter.py	100.00% <ø> (ø)
junifer/preprocess/_temporal_slicer.py	98.24% <ø> (-0.17%)	⬇️
junifer/preprocess/base.py	90.00% <ø> (+2.24%)	⬆️
.../preprocess/confounds/fmriprep_confound_remover.py	99.45% <ø> (-0.02%)	⬇️
junifer/preprocess/smoothing/smoothing.py	89.28% <ø> (-1.63%)	⬇️
junifer/preprocess/warping/space_warper.py	100.00% <ø> (+3.57%)	⬆️

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[github-actions]

PR Preview Action v1.6.2
Preview removed because the pull request was closed.
2025-11-07 12:48 UTC

[synchon]

CI passes on juseless.