Handle direct mapping states in MTT mean extraction

[FlorianPfaff]

Bug

get_extract_mean("euclidean", mtt_scenario=True) already extracts mapping values when a tracker exposes them through .tracks or get_tracks(). However, passing the equivalent mapping directly as the filter state falls through to _point_estimate_or_mean(...), so the dictionary itself is returned instead of the per-track estimates.

This makes semantically equivalent MTT state representations behave differently and can leak track objects into evaluation output.

Fix

Treat a direct Mapping like the already-supported list and tuple track collections. The existing _extract_track_collection_mean(...) helper then preserves mapping insertion order and extracts each track's point estimate or mean.

Regression coverage

Add a focused test for a plain {track_id: track} state and verify that it returns an ordered list of numeric track means.

Validation

• reproduced the failure against current main (1 failed, 2 passed);
• applied the one-line dispatch fix;
• focused regression suite passes (3 passed);
• both changed files compile successfully;
• branch is 2 commits ahead and 0 behind main, with only 17 changed lines across the implementation and test.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	29.33s
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✅ JSON	v8r	7		0	0	5.28s
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✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.67s
✅ PYTHON	black	1865	87	0	0	102.32s
✅ PYTHON	isort	1865	139	0	0	2.95s
✅ REPOSITORY	betterleaks	yes		no	no	2.57s
✅ REPOSITORY	checkov	yes		no	no	56.91s
✅ REPOSITORY	gitleaks	yes		no	no	18.69s
✅ REPOSITORY	git_diff	yes		no	no	0.55s
✅ REPOSITORY	secretlint	yes		no	no	89.03s
✅ REPOSITORY	syft	yes		no	no	5.34s
✅ REPOSITORY	trivy-sbom	yes		no	no	6.24s
✅ REPOSITORY	trufflehog	yes		no	no	33.62s
✅ YAML	prettier	11	0	0	0	0.92s
✅ YAML	v8r	11		0	0	13.61s
✅ YAML	yamllint	11		0	0	0.61s

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