Show per-indexer grab share and rebuild the Indexers card as a list

The Indexers card sat beside Requests as a stretched, vertically centred
grid of pills — mostly dead space once the Ombi list was expanded, and it
said nothing about which indexer was actually doing the work.

- Fetch Prowlarr's indexerstats over a rolling 30-day window and merge
  per-indexer queries/grabs into the summary. Cached 10 min on success and
  never on failure, so a stats outage can't blank the column after it
  recovers or take the up/down list down with it.
- Rank indexers busiest-first by grab share (query share as fallback);
  queries mostly count enabled indexers, grabs count who delivered.
- One indexer per line, matched to the Ombi request rows: same padding,
  gap, radius and two-line body, plus a share bar scaled to the busiest
  indexer and an Online/Offline badge the 30s poll keeps current.
- Let that row size cards to their own content instead of stretching.

Bump APP_VERSION to 1.2.0.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

static/js/dashboard.js

@@ -187,6 +187,12 @@ async function pollProwlarr() {
       const light = document.getElementById('idx-light-' + idx.id);
       if (row)   { row.classList.toggle('up', idx.up);   row.classList.toggle('down', !idx.up); }
       if (light) { light.classList.toggle('up', idx.up); light.classList.toggle('down', !idx.up); }
+      const badge = document.getElementById('idx-badge-' + idx.id);
+      if (badge) {
+        badge.classList.toggle('online', idx.up);
+        badge.classList.toggle('offline', !idx.up);
+        badge.textContent = idx.up ? 'Online' : 'Offline';
+      }
     });
     updateServicePill('prowlarr', d.up_count === d.total && d.total > 0);
     const stat = document.getElementById('svc-stat-prowlarr');