fix: validate plot kwargs and fix docstring refs (#1978)

[BHARATH0153]

changes

1. diag_kwargs / upper_kwargs / lower_kwargs now raise a ValueError on unknown keys instead of silently ignoring typos.
2. Fixed docstring and deprecation references from the non-existent _get_default_fig_kwargs to the real FigOptions / get_default_* functions.

closes #1978

Addresses items 2 and 3 of #1978
. Item 1 (NumPy array limits handling) was already fixed and merged in #2000.

checks

Validation performed:

• uv run pytest tests/plot_test.py (non-tensorboard) passes.
• uv run ruff check and uv run ruff format --check pass for the changed files.

Checklist

• I have read the contributing guide.
• uv run pytest -n auto -m "not slow and not gpu" passes.
• uv run pre-commit run --all-files passes (ruff and formatting).
• uv run pyright sbi passes.
• I added or updated tests for the changed behavior.
• I used Google-style docstrings for new or changed public functions.
• (If applicable) I reported how long new tests run and marked slow ones
  with pytest.mark.slow.

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📝 Walkthrough

Walkthrough

The plotting utilities now reject unknown plot keyword arguments. Docstrings and deprecation warnings reference the current default-options APIs. Tests cover validation errors and the updated warning message.

Changes

Plot API validation

Layer / File(s)	Summary
Plot keyword validation sbi/analysis/plot.py, tests/plot_test.py	_prepare_kwargs raises a ValueError for unknown keys before merging kwargs. Parameterized tests cover diagonal, upper, and lower plot kwargs.
Deprecation and API references sbi/analysis/plot.py, tests/plot_test.py	Docstrings and the _get_default_opts warning reference get_default_diag_kwargs, get_default_offdiag_kwargs, and FigOptions. A test verifies the warning references FigOptions and excludes the obsolete function name.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to cbbe4

Plotting now reports invalid keyword arguments clearly, while documentation and deprecation references point to the current APIs. The change is ready to merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR satisfies issue #1978 items 2 and 3 by rejecting unknown plot keyword arguments, correcting references to FigOptions and get_default_* functions, and adding regression tests. The NumPy limi…
Out of Scope Changes check	✅ Passed	The code, documentation, and tests are directly related to the linked issue and stated PR objectives. No unrelated changes are identified.
Docstring Coverage	✅ Passed	Docstring coverage is 83.33% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 2 files.
Title check	✅ Passed	The title clearly summarizes the two main changes: plot keyword validation and corrected documentation references. It is concise and specific.
Description check	✅ Passed	The description explains the changes, links issue #1978, reports validation, and includes the checklist. The optional “Anything else should we know?” section is omitted, but the description is otherwi…

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Actionable comments posted: 2

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Inline comments:
In `@sbi/analysis/plot.py`:
- Around line 971-973: Update the kwargs validation around plot_kwargs_i and
plot_kwarg_filled_i so user-supplied kwargs are validated even when plot_i is
None and get_default_kwargs returns an empty mapping; reject any non-empty
unsupported keys while preserving acceptance of empty kwargs and existing
validation for selected plot styles.

In `@tests/plot_test.py`:
- Line 577: Update the pytest.warns assertion around the FigOptions warning to
capture the emitted warning, then assert that its message does not contain
“_get_default_fig_kwargs” while retaining the existing FigOptions expectation.

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• sbi/analysis/plot.py
• tests/plot_test.py

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.45%. Comparing base (48fd958) to head (cbbe43b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2006   +/-   ##
=======================================
  Coverage   89.45%   89.45%           
=======================================
  Files         141      141           
  Lines       14487    14491    +4     
=======================================
+ Hits        12959    12963    +4     
  Misses       1528     1528           

Flag	Coverage Δ
fast	84.39% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sbi/analysis/plot.py	77.99% <100.00%> (+0.09%)	⬆️

[BHARATH0153]

@janfb "Thanks! Please review this whenever you have time