fix: Failure to create playlist from importing an M3U file with duplicate tracks

[cyanChill]

Why

This PR fixes an edge case which prevents the creation of a playlist when importing from an M3U file. The problem is that it's possible for the M3U file to reference the same track multiple time (ie: if it was created from a different app which supports having a track appear multiple times). In our case, we didn't account for this, so when we went to create the tracksToPlaylists relations, Drizzle will throw an error since we were trying to insert a new entry with a track id that's already used.

Checklist

• Documentation is up to date to reflect these changes.
• Ensure dependency licenses are up-to-date by running pnpm sync:licenses.
• This diff will work correctly for pnpm android:prod.

Summary by CodeRabbit

• Bug Fixes
  • Improved M3U playlist import efficiency by eliminating redundant track lookups for duplicate playlist entries, enhancing performance during backup restoration.

[cyanChill]

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Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: b110a878-2741-42c5-a7cf-f00cab1f03fa

📥 Commits

Reviewing files that changed from the base of the PR and between 8adde73 and 77698ae.

📒 Files selected for processing (1)

• mobile/src/modules/backup/M3U.ts

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📝 Walkthrough

Walkthrough

This PR deduplicates track URIs computed during M3U playlist reading by wrapping the strategy-based URI mapping in a Set before converting it back to an array, preventing repeated playlist entries from generating redundant database lookups.

Changes

M3U Playlist URI Deduplication

Layer / File(s)	Summary
Deduplicate trackUris in playlist reading mobile/src/modules/backup/M3U.ts	readM3UPlaylist wraps the computed trackUris (absolute/relative/unmodified strategy mapping) in a Set to remove duplicates, then converts back to an array, ensuring repeated playlist entries do not create duplicate database lookup URIs.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

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