scheduler: smart auto-scroll replaces separate scroll lock checkbox; lidarr: allow single-seed candidates

Auto Scroll now pauses automatically when user scrolls up and resumes
when they reach the bottom — no separate Scroll Lock needed.

Lidarr discovery no longer hard-skips single-seed candidates; they
score low on breadth but can still reach threshold on merit.

Media/playback_aware_lidarr_discovery.sh

@@ -571,12 +571,6 @@ for candidate in "${!CANDIDATE_SCORE[@]}"; do
         days_ago=0
     fi
 
-    if (( seed_count < 2 )); then
-        log "  $ICON_SKIP Single-seed candidate skipped: $candidate"
-        REJECT_LIST+=("0|${candidate}|${seed_count}|0|single-seed skip")
-        continue
-    fi
-
     affinity_s=$(_affinity_score "$raw_score")
     breadth_s=$(_breadth_score "$seed_count")