Skip hidden (dot-prefixed) directories in the library scan

[riffsmith3]

The library scanner descends into hidden (dot-prefixed) directories, so a plugin that keeps an on-disk cache or working files under a .-prefixed folder in the DLC root has those files indexed as library songs (surfacing as duplicates in the library). This excludes any path with a hidden component below the DLC root, alongside the existing tutorials-builtin / minigames-builtin carve-outs.

Summary by CodeRabbit

• Bug Fixes
  • Hidden folders within the DLC directory are now excluded from library listings.
  • Built-in tutorial and minigame folders continue to be omitted from scan results.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a5dd8d16-eec4-4b74-8082-d50daf2bd012

📥 Commits

Reviewing files that changed from the base of the PR and between db3ca34 and bedebab.

📒 Files selected for processing (1)

• lib/scan.py

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📝 Walkthrough

Walkthrough

The library scanner now excludes hidden dot-prefixed directories within the DLC tree, in addition to the existing built-in directories, from sloppak and loose song folder discovery.

Changes

Library scan filtering

Layer / File(s)	Summary
Exclude hidden DLC directories lib/scan.py	_is_excluded_from_library now detects dot-prefixed path components relative to the DLC root and excludes those directories from scanning.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: excluding hidden dot-prefixed directories from the library scan.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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