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/WantList.svelte

@@ -22,6 +22,10 @@
   // runs one now. Taking a held album off leaves its files and stops it
   // being fetched back if they go.
   //
+  // Upgrades (#5524) are held albums wanted for a better copy: below the
+  // quality set under Acquisition, or holding a video rip. They search and
+  // download like an open want, and say what copy they have.
+  //
   // The list reads like the library (#5572): artists A–Z, each with its
   // albums oldest first, and each album's tracks a click away. The filter
   // narrows it to an artist or album by name, on the server, so it finds
@@ -166,6 +170,15 @@
     return `Imported ${n} ${relativeTime(g.imported_at)} from ${g.name}`;
   }
 
+  // A want the schedule still searches for: open, or held but wanted for a
+  // better copy.
+  const searchable = (w: Want) => !w.held_at || !!w.upgrade;
+
+  function upgradeLine(w: Want): string {
+    if (w.upgrade === 'rip') return 'A track is a video rip; looking for a clean copy';
+    return w.held_quality ? `You have ${w.held_quality}; looking for better` : 'Looking for a better copy';
+  }
+
   const attention = (w: Want) => w.grab?.live && (w.grab.import_state === 'review' || w.grab.import_state === 'failed');
 
   function why(w: Want): string {
@@ -231,11 +244,16 @@
     <p class="mt-3 text-text-primary">
       {#if artist}None of this artist's albums are in the catalogue.
       {:else if list === 'missing'}No missing albums are wanted back.
+      {:else if list === 'upgrade'}No album is wanted for a better copy.
       {:else}Nothing is wanted.{/if}
     </p>
     <p class="mt-1 text-sm text-text-secondary">
       {#if list === 'missing'}
         An album whose files stay missing past the grace window on the Missing files page lands here.
+      {:else if list === 'upgrade'}
+        An album you have below the quality set under
+        <a href="/admin/acquisition" class="text-accent-fg hover:underline">Acquisition</a>, or with a video
+        rip among its tracks, lands here.
       {:else}
         A request you approve, a new release from a followed artist, or an album whose files went
         missing lands here.
@@ -278,7 +296,10 @@
                   <div class="text-xs text-text-muted" data-testid="want-why">
                     {why(w)} · {w.held_at ? `held ${relativeTime(w.held_at)}` : `wanted ${relativeTime(w.wanted_at)}`}
                   </div>
-                  {#if !w.held_at}
+                  {#if w.held_at && w.upgrade}
+                    <div class="truncate text-xs text-text-secondary" data-testid="want-upgrade">{upgradeLine(w)}</div>
+                  {/if}
+                  {#if searchable(w)}
                     <div
                       class="text-xs {attention(w) ? 'text-text-primary' : 'truncate text-text-secondary'}"
                       data-testid="want-search"
@@ -303,7 +324,7 @@
                     <ListMusic size={12} strokeWidth={2} /> Tracks
                     <ChevronDown size={12} strokeWidth={2} class={shown === w.id ? 'rotate-180' : ''} />
                   </button>
-                  {#if !w.held_at}
+                  {#if searchable(w)}
                     <button
                       type="button"
                       onclick={() => onSearch(w)}
@@ -339,7 +360,7 @@
                   <WantTracks wantId={w.id} />
                 </div>
               {/if}
-              {#if open === w.id && !w.held_at}
+              {#if open === w.id && searchable(w)}
                 <div class="sm:pl-[4.25rem]">
                   <WantCandidates wantId={w.id} title={w.title} />
                 </div>