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feat(Beatport MusicBrainz Importer.user.js): Unify and optimize update logic

Refactors the main runUpdate function to eliminate redundant code paths.

Previously, the script had two separate logic branches: one for the release detail page (which did a single URL lookup) and one for list pages (which did a batch lookup). This violated the DRY principle.

This commit unifies this logic into a single, more efficient pipeline:

1. Gathers all URLs (either the single detail URL or all list URLs).
2. Normalizes all URLs.
3. Fetches MusicBrainz data for all URLs in a single batch API call.
4. Updates the UI based on the results (buttons for detail, icons for list).

This change also:

• Improves cache invalidation: the detail page button now invalidates only its specific URL (invalidateCacheForUrl) instead of clearing the entire cache.
• Adds a cache-clearing onclick handler to the list page import icons.

bump MusicBrainz API Module version

refactor: use shared MusicBrainzAPI module

strip language codes from URLs for API calls to MusicBrainz

add @connect directive

buttons on release pages now have the same size and shape as share buttons

add support for Beatport URLs with language code

improve artist and release name extraction for search button