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/quarantine/+page.svelte

@@ -170,7 +170,6 @@
     <ul class="divide-y divide-border rounded-lg border border-border bg-surface">
       {#each rows as r (r.track_id)}
         {@const isExpanded = !!expanded[r.track_id]}
-        {@const lidarrDisabled = !r.lidarr_album_mbid}
         {@const primary: RowAction = {
           icon: RotateCcw,
           label: 'Resolve',
@@ -190,7 +189,19 @@
             ariaLabel: `Delete file for ${r.track_title}`,
             onclick: () => openDeleteFile(r),
             danger: true
-          }
+          },
+          // In the row's actions, so a phone reaches it from the menu too
+          // (#5604). A local-only track has no Lidarr album to remove, so
+          // it isn't offered.
+          ...(r.lidarr_album_mbid
+            ? [{
+                icon: Cloud,
+                label: 'Delete via Lidarr',
+                ariaLabel: `Delete via Lidarr for ${r.track_title}`,
+                onclick: () => openDeleteLidarr(r),
+                danger: true
+              }]
+            : [])
         ]}
         <li
           class="flex items-start gap-4 p-3"
@@ -219,7 +230,7 @@
               {r.track_title}
             </div>
             <div class="truncate text-sm text-text-secondary">
-              {r.artist_name} · {r.album_title} · {r.report_count} reports — latest {relativeTime(r.latest_at)}
+              {r.artist_name} · {r.album_title} · {r.report_count} {r.report_count === 1 ? 'report' : 'reports'} — latest {relativeTime(r.latest_at)}
             </div>
 
             <!-- Reason distribution pills -->
@@ -247,7 +258,7 @@
                 strokeWidth={1.5}
                 class="transition-transform {isExpanded ? 'rotate-90' : ''}"
               />
-              {isExpanded ? 'Hide reports' : `Show ${r.reports.length} reports`}
+              {isExpanded ? 'Hide reports' : `Show ${r.reports.length} ${r.reports.length === 1 ? 'report' : 'reports'}`}
             </button>
 
             {#if isExpanded}
@@ -273,29 +284,6 @@
           <div class="flex shrink-0 items-center gap-2">
             <RowActionsMenu {primary} {secondary} />
 
-            {#if lidarrDisabled}
-              <span
-                aria-label={`Delete via Lidarr disabled for ${r.track_title}`}
-                title="Local-only track — no Lidarr album to remove."
-                class="hidden md:inline-flex items-center gap-1 rounded-md bg-action-destructive px-3 py-1.5 text-sm text-action-fg opacity-50 cursor-not-allowed"
-                data-testid="delete-lidarr-disabled"
-              >
-                <Trash2 size={14} strokeWidth={2} />
-                <Cloud size={14} strokeWidth={2} />
-                Delete via Lidarr
-              </span>
-            {:else}
-              <button
-                type="button"
-                aria-label={`Delete via Lidarr for ${r.track_title}`}
-                class="hidden md:inline-flex items-center gap-1 rounded-md bg-action-destructive px-3 py-1.5 text-sm text-action-fg"
-                onclick={() => openDeleteLidarr(r)}
-              >
-                <Trash2 size={14} strokeWidth={2} />
-                <Cloud size={14} strokeWidth={2} />
-                Delete via Lidarr
-              </button>
-            {/if}
           </div>
         </li>
       {/each}
@@ -311,7 +299,7 @@
   {#if deleteFileRow}
     <p class="-mt-2 text-sm text-text-secondary">
       Remove <em class="font-medium text-text-primary">{deleteFileRow.track_title}</em>
-      from disk and clear {deleteFileRow.report_count} reports? Lidarr may auto-redownload depending on its monitor settings.
+      from disk and clear {deleteFileRow.report_count} {deleteFileRow.report_count === 1 ? 'report' : 'reports'}? Lidarr may auto-redownload depending on its monitor settings.
     </p>
     <div class="mt-5 flex justify-end gap-2">
       <button