fix(artwork): log when a manual motion cover wins over the plugins

[InstaZDLL]

What

fetch_album_motion_artwork returns a manual motion cover before the "resolving motion artwork" debug line runs. As a result, a diagnostic log shows nothing when a hand-set cover is on screen. On #766 this made a manual cover look like the plugin's. The plugin was then investigated for a cover it never produced.

• Add a debug line when the manual cover wins. It logs the artist, the album and the album id.
• Add a debug line when the album_motion_artwork row exists but its file is gone. The album then falls back to its static cover.
• docs/features/plugins.md mentions both lines.

No behaviour change.

Checks

• cargo fmt --check and cargo check pass.
• Local CodeRabbit review: 0 findings.

Summary by CodeRabbit

• Documentation

  • Précision des conditions dans lesquelles une couverture animée manuelle est utilisée à la place des plugins et du signalement d’un fichier manquant.

• Corrections

  • Amélioration des logs lors de l’utilisation d’une couverture manuelle et lorsqu’un fichier associé est absent. Le comportement reste inchangé si ce fichier est introuvable.

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🧰 Additional context used

📚 Code guidelines (1)

AGENTS.md — auto-discovered

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 1740008 and 32d8f80.

📒 Files selected for processing (2)

• docs/features/plugins.md
• src-tauri/crates/app/src/commands/motion_artwork.rs

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📝 Walkthrough

Walkthrough

Le code ajoute des messages debug lorsque la couverture manuelle prévaut ou que son fichier est absent. La recherche continue de renvoyer None si le fichier manque. La documentation décrit ces comportements.

Changes

Journalisation des couvertures manuelles

Layer / File(s)	Summary
Recherche et journalisation des couvertures manuelles src-tauri/crates/app/src/commands/motion_artwork.rs, docs/features/plugins.md	Le code journalise la couverture manuelle retenue et l’absence du fichier associé. La documentation précise que les plugins sont ignorés lorsqu’une couverture manuelle s’applique.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~4 minutes

Change: Refactor

Merge Risk: ⚪ Minimal · up to 32d8f

This PR adds diagnostics and documentation without changing artwork behavior; no material merge risk was identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	Le titre suit le format Conventional Commits et décrit clairement l’ajout de logs lorsqu’une couverture animée manuelle est sélectionnée.
Description check	✅ Passed	La description explique les deux cas journalisés et indique les vérifications exécutées. Elle ne reprend pas la checklist du modèle et ne confirme pas toutes les commandes demandées, mais elle fournit…
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 1 files. (1 skipped: 1 …
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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