fix: admin bugs from the audit: a playback-error delete no longer reports failure, a failed Overview load no longer reads as all-clear, and email settings can't be saved over with defaults (M503 #5604)

- Playback errors: Delete file stops resolving the error row the track
  deletion already took with it (ON DELETE CASCADE), which 404'd into
  "Delete failed".
- Overview: a queue that fails to load says so with Try again, and its tile
  shows a dash, not 0. Delete via Lidarr shows only for an album Lidarr
  holds while Lidarr is connected. An approve refreshes the Collection.
- Quarantine: Delete via Lidarr is in the row menu, so a phone reaches it;
  "1 report", not "1 reports".
- Duplicates: the Keep badge follows the copy picked.
- Integrations: provider save failures and load errors are said, not
  swallowed or shown as "No providers registered"; the Lidarr test catches
  a failed call; SMTP fills once and Save stays off until it has loaded.
  Lidarr's blurb says what it is still used for.
- Requests: release profiles point at Collection › Following.
- Library: an empty library sends an admin to Admin to run a scan, and
  tells anyone else the admin scans it, instead of opening Settings.

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

web/src/routes/admin/duplicates/+page.svelte

@@ -432,7 +432,8 @@
 
           <ul class="divide-y divide-border">
             {#each group.members as m (m.track_id)}
-              {@const keep = m.track_id === group.survivor_track_id}
+              {@const keep = keeperOf(group) === m.track_id}
+              {@const proposed = m.track_id === group.survivor_track_id}
               <li class="flex items-start gap-3 px-4 py-3" data-testid="duplicate-member">
                 <input
                   type="radio"
@@ -446,14 +447,15 @@
                   <div class="flex flex-wrap items-center gap-2">
                     <span class="truncate text-sm text-text-primary">{m.title}</span>
                     {#if keep}
-                      <!-- The proposed copy to keep, with the rule that chose it.
-                           A default the merge will let the operator override. -->
+                      <!-- The copy the merge will keep: the proposed one with the
+                           rule that chose it, or the one the operator picked. The
+                           badge follows the pick, as the merge does (#5604). -->
                       <span
                         class="shrink-0 rounded-full bg-accent-tint px-2 py-0.5 text-xs text-accent-fg"
                         data-testid="survivor-badge"
-                        title="Proposed to keep: {group.survivor_reason}"
+                        title={proposed ? `Proposed to keep: ${group.survivor_reason}` : 'Your pick'}
                       >
-                        Keep · {group.survivor_reason}
+                        Keep · {proposed ? group.survivor_reason : 'your pick'}
                       </span>
                     {/if}
                   </div>

web/src/routes/admin/duplicates/duplicates.test.ts

@@ -151,6 +151,15 @@ describe('admin duplicates', () => {
     expect(rows[1].querySelector('[data-testid="survivor-badge"]')).toBeNull();
   });
 
+  test('picking another copy moves the keep badge to it', async () => {
+    renderWith(response());
+    const rows = screen.getAllByTestId('duplicate-member');
+    await fireEvent.click(rows[1].querySelector('input[type="radio"]') as HTMLInputElement);
+    const after = screen.getAllByTestId('duplicate-member');
+    expect(after[0].querySelector('[data-testid="survivor-badge"]')).toBeNull();
+    expect(text(after[1].querySelector('[data-testid="survivor-badge"]') as HTMLElement)).toBe('Keep · your pick');
+  });
+
   test('an acoustic group reads as a match percentage', () => {
     const r = response();
     r.groups[0] = { ...r.groups[0], tier: 'acoustic', worst_bit_error_rate: 0.04 };