Two interacting bugs that left LB Sync-tab cards rendering with a
solid orange gradient background instead of the dark glass style
every other Sync-page card uses:
1. **Duplicate element id** ``listenbrainz-tab-content``: the new
Sync-tab content div reused the same id the Discover page's
pre-existing LB section already owned. Two elements with the
same id is invalid HTML, and ``getElementById`` in the refresh
loop was hitting the Sync version first while ``initialize
SyncPage``'s ``${tabId}-tab-content`` lookup could race against
it. Renamed the Sync-page tab id + ``data-tab`` attribute to
``listenbrainz-sync`` (matches the existing ``${tabId}-tab-
content`` convention so the lookup becomes
``listenbrainz-sync-tab-content``). Discover-page LB tab
keeps its original id untouched.
2. **Dead ``.listenbrainz-playlist-card`` rule** at style.css
L36155 painting a solid ``linear-gradient(#eb743b → #d26230)``
over the card. That class was orphaned — no JS or HTML
instantiated it before Phase 1c.1 — but it sat at higher
source order than my unified ``.youtube-playlist-card,
.tidal-playlist-card, ...`` rule, so the bare-class selector
won the cascade and overwrote the dark glass background.
Also removed the matching dead ``.listenbrainz-icon { font-
size: 48px }`` rule and its local ``@keyframes pulse`` copy
(the keyframes are defined in four other live blocks).
3. **Missing LB selectors in unified inner-element rules**:
``.listenbrainz-playlist-card`` was only added to the OUTER
card selector group in the first pass — the inner
``.playlist-card-icon`` / ``.playlist-card-content`` /
``.playlist-card-name`` / ``.playlist-card-info`` /
``.playlist-card-action-btn`` (+ ::before, :hover, :disabled)
selector groups were left out, so the inner elements lost all
their styling. Bulk-added LB to every group so the card
inherits the full glass shell the other sources get, with a
brand-orange ``rgba(235, 116, 59, ...)`` accent matching the
Tidal / Deezer / Spotify-public pattern.
969d5ffc1b
