v1.6.0

New features

• Genre Breakdown, Spotify-verified: filter Last.fm's community tags down to Spotify's own genre vocabulary (SPOTIFY_GENRE_SEEDS) when Spotify credentials are configured, so tags that are really artist names, list titles, or one-off scrobbler noise don't show up as genres. Common near-duplicate spellings (Rnb/R&B, Dnb/Drum N Bass/Drum & Bass) are collapsed onto one canonical entry.
• Genre Breakdown, less noisy: a "Show: all / above 1% / 2% / 5%" dropdown hides small legend rows (the bar itself stays untouched) so a full genre scan doesn't make the page too long. The selected threshold persists as you switch periods.
• Before They Were Famous, verified: each candidate is checked against Spotify's own artist search before being included, filtering out soundtrack/compilation scrobbles where the "artist" field is really an album or production title (e.g. "Monster High the Movie"). Spotify's Client Credentials auth was extracted into a shared lib/Spotify.php, reused by both this and the existing quick-listen links.
• Multi-artist credit filtering: Before They Were Famous and Obscurity Index now both filter out multi-artist scrobble credits ("Artist A, Artist B & Artist C"), which Last.fm otherwise treats as one low-listener "artist" — a source of false "obscure find" results.
• YouTube quota protection: a local 24-hour call counter (youtube_daily_limit, default 100) caps live YouTube API lookups so quick-listen links can't exceed the free quota; excess lookups fall back to the search link.
• Distance Listened, at a glance: each comparison (flights, marathons, Moon/Mars trips, etc.) now shows a progress bar for the fractional remainder — e.g. "~74 flights, 64%" — instead of a bare decimal count.
• BPM Average, visualized: replaced the plain pulsing dot with an animated ECG-style heart-monitor trace, scrolling at the real average-BPM's beat interval.

Fixes

• ListenLinks caching bug: a failed Spotify/YouTube request (auth hiccup, network error) was being cached as a permanent "no match" for 30 days — indistinguishable from a genuine miss. Now only a completed API response gets cached, so a transient failure retries fresh next time instead of freezing a track's button on "Search" for a month.