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feat: add synchronous cache access method

fix: resolve persistent API error and add auto-retry on reconnection

• Prevent caching of network errors in YouTubeAPI to allow recovery.
• Differentiate between 404s (cached) and network errors (not cached) in MB API.
• Add auto-retry listener for 'online' event in both YouTube and MB APIs to recover from disconnects automatically.

Update version to 0.2.4 and adjust base URL logic

Fix cache redundancy and ensure lookupUrl returns a Map

Resolves a stale data bug in the YouTube MusicBrainz Importer that was caused by a redundant, local cache (_urlCache) which was not being invalidated.

Removing this redundant cache revealed a subsequent TypeError, as the importer expected a Map from _mbApi.lookupUrl, but the MusicBrainzAPI.js library returned a plain Object. This commit refactors the MusicBrainzAPI.js library to have its lookupUrl method return a Map to fix this underlying issue.

fix:(MusicBrainzAPI.js) batch URL lookup