Release 2.8.0: version bump + docker-publish tag + What's New / version modal + PR description
- web_server: _SOULSYNC_BASE_VERSION 2.7.9 -> 2.8.0
- docker-publish.yml: default version_tag -> 2.8.0
- pr_description.md: rewritten for 2.8.0 (preview-clip cleanup, unverified-queue self-heal #934,
album-completeness split albums #936, clear-completed, youtube cookies, #937, discography
speed, wishlist art, dashboard perf #935, bounded memory #802)
- helper.js: WHATS_NEW carries the 2.8.0 block + folded "Earlier versions" summary;
VERSION_MODAL_SECTIONS leads with 2.8.0 highlights, rolls 2.7.9 into an aggregator
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