feat: a held album below the quality you settle for, or holding a video rip, stays wanted for a better copy, and the import replaces the old tracks with their likes and plays carried over (M502 #5524)

- acquisition_settings.upgrade_until (default High quality lossy, Lidarr's
  cutoff, note #5527; "" is off), an "Upgrade until" row under Searching.
- The wanted worker judges held albums hourly: tier per format from size per
  second (the scanner records no bitrate), the album's worst. Below the
  cutoff it is wanted for quality; a video rip among its tracks always.
- The schedule searches upgrades weekly, after open wants; a release no
  better than the copy held is refused ("not_better").
- The import matches each file to the track it would replace (recording,
  then disc/track) and replaces it when it is a rip or the file is a better
  tier: over the same path in one rename, or filed beside it and the old
  track folded in (library.ReplaceTrack: file first, then foldTrackInto).
  Nothing better: the release is set aside.
- Collection › Upgrades (Lidarr's Cutoff Unmet); Suspect sources says when a
  clean copy was looked for instead of Lidarr's search.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/lib/components/wanted/CollectionRail.svelte

@@ -6,7 +6,8 @@
   // catalogue of artists first, then the sections that show state. Activity
   // carries a second, accented count when downloads are waiting on a person.
   // Unmatched, like Lidarr's Unmapped Files, holds the library albums no
-  // MusicBrainz album matched (#5579).
+  // MusicBrainz album matched (#5579). Upgrades, Lidarr's Cutoff Unmet,
+  // holds the albums held but wanted for a better copy (#5524).
 
   let { counts }: { counts?: WantCounts } = $props();
 
@@ -15,6 +16,7 @@
     { href: '/collection', label: 'Catalogue', count: counts?.artists, exact: true, also: ['/collection/artist/'] },
     { href: '/collection/wanted', label: 'Wanted', count: counts?.wanted },
     { href: '/collection/missing', label: 'Missing files', count: counts?.missing },
+    { href: '/collection/upgrades', label: 'Upgrades', count: counts?.upgrades },
     { href: '/collection/activity', label: 'Activity', count: counts?.activity, attention: counts?.attention },
     { href: '/collection/following', label: 'Following', count: counts?.following },
     { href: '/collection/blocked', label: 'Blocked', count: counts?.blocked },