Fix SE(3) plot-state sample indexing

[FlorianPfaff]

Bug

AbstractSE3Distribution.plot_state() indexed sampled SE(3) states as if samples were stored in columns. PyRecEst's distribution sampling contract returns an array shaped (n_samples, state_dim), including AbstractDiracDistribution.sample().

For two SE(3) samples shaped (2, 7), the previous implementation iterated over the seven state coordinates and assembled seven malformed vectors of shape (2,). It mixed coordinates from different samples and could then fail inside plot_point() or plot incorrect poses.

Fix

• iterate over the sample axis (samples.shape[0]);
• read quaternion and linear coordinates from each sample row;
• preserve the existing showMarginalized=True behavior by combining each sampled quaternion with the mode's linear position;
• add a regression asserting that two row-major SE(3) samples produce exactly two unchanged plotted states.

Validation

• isolated pre-fix reproduction: 2 samples shaped (2, 7) became 7 vectors shaped (2,);
• isolated patched reproduction: the same input remains 2 vectors shaped (7,) and matches the original samples;
• branch is 2 commits ahead and 0 behind main;
• final diff is limited to the SE(3) plotting method and its focused test.

GitHub Actions should run the repository's full supported backend and test matrix.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	25.38s
✅ JSON	prettier	7	0	0	0	0.97s
✅ JSON	v8r	7		0	0	3.49s
✅ MARKDOWN	markdownlint	68	0	0	0	1.88s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.55s
✅ PYTHON	black	1809	56	0	0	86.34s
✅ PYTHON	isort	1809	88	0	0	2.66s
✅ REPOSITORY	betterleaks	yes		no	no	1.27s
✅ REPOSITORY	checkov	yes		no	no	53.35s
✅ REPOSITORY	gitleaks	yes		no	no	16.0s
✅ REPOSITORY	git_diff	yes		no	no	0.15s
✅ REPOSITORY	secretlint	yes		no	no	79.55s
✅ REPOSITORY	syft	yes		no	no	5.64s
✅ REPOSITORY	trivy-sbom	yes		no	no	6.46s
✅ REPOSITORY	trufflehog	yes		no	no	31.3s
✅ YAML	prettier	11	0	0	0	0.75s
✅ YAML	v8r	11		0	0	12.18s
✅ YAML	yamllint	11		0	0	0.61s

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