Fix multi-session skeleton

[Deterous]

For multi-session skeletons, the LBA does not start at 0 and the detected files don't get erased.
This fix adds the LBA of the first sector to the inside-contents check to account for this.

Summary by CodeRabbit

• Bug Fixes
  • Fixed sector offset alignment in ISO9660 skeleton creation to correctly handle file system area mapping.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: fb33ce5d-a152-4dca-8d05-f403e1f569f3

📥 Commits

Reviewing files that changed from the base of the PR and between 101f4a6 and 964d971.

📒 Files selected for processing (1)

• skeleton.ixx

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📝 Walkthrough

Walkthrough

The change adjusts sector indexing in skeleton creation logic to align sector numbering with the ISO9660 area map's starting LBA offset by adding area_map[0].lba to the sector index when checking membership.

Changes

Cohort / File(s)	Summary
Sector offset alignment skeleton.ixx	Modified membership check during sector erasure to account for area map's starting LBA offset by adjusting sector index from s to s + area_map[0].lba.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A sector shifts, its offset found,
Where LBA marks the ISO ground,
No longer lost in numbered space,
Each block now knows its proper place! 📍

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Fix multi-session skeleton' directly addresses the main change: adjusting sector indexing for multi-session skeleton creation by accounting for non-zero starting LBA.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[superg]

Good catch!