feat(web): admin playback-errors inbox

Surfaces client-reported playback failures from /api/admin/playback-errors
in a new admin tab. Tabs: Unresolved (default) / Resolved. Each row
shows track + artist + album, error kind badge, who hit it, when,
optional client-supplied detail, and the absolute file path so the
operator can grep the library mount without leaving the page.

Per-row actions (RowActionsMenu):
- Resolve (primary) — modal with Fixed / Ignored dropdown for the
  "no further action taken" cases.
- Copy — JSON payload to clipboard with track_id / file_path / kind
  / detail / reporter / client_id / occurred_at. Matches the
  operator's "logs with a copy-out function" ask.
- Delete file (danger, modal-confirm) — uses the existing
  /api/admin/quarantine/{track_id}/delete-file endpoint AND
  auto-stamps resolution='deleted' so a single click closes both
  the file and the inbox row.

Deferred to a follow-up: Hide (the existing quarantine flow is
per-user-flag, not a true library-hide), and Re-request via Lidarr
(needs album MBID join — not in the current ListAdminPlaybackErrors
projection).

Also: admin tab list grows from five to six; AdminTabs.test.ts
updated.

web/src/lib/api/admin.ts

@@ -3,6 +3,7 @@ import { api } from './client';
 import { qk } from './queries';
 import type {
   ActionResult,
+  AdminPlaybackError,
   AdminQuarantineRow,
   LidarrConfig,
   LidarrMetadataProfile,
@@ -11,7 +12,8 @@ import type {
   LidarrRequest,
   LidarrRequestStatus,
   LidarrRootFolder,
-  LidarrTestResult
+  LidarrTestResult,
+  PlaybackErrorResolution
 } from './types';
 
 // Admin Lidarr config -----------------------------------------------------
@@ -174,6 +176,34 @@ export function createQuarantineActionsQuery(limit: number = 50) {
   });
 }
 
+// Admin playback errors ---------------------------------------------------
+
+export async function listAdminPlaybackErrors(
+  resolved: boolean = false
+): Promise<AdminPlaybackError[]> {
+  return api.get<AdminPlaybackError[]>(
+    `/api/admin/playback-errors?resolved=${resolved}`
+  );
+}
+
+export async function resolvePlaybackError(
+  id: string,
+  resolution: PlaybackErrorResolution
+): Promise<{ id: string }> {
+  return api.post<{ id: string }>(
+    `/api/admin/playback-errors/${id}/resolve`,
+    { resolution }
+  );
+}
+
+export function createAdminPlaybackErrorsQuery(resolved: boolean = false) {
+  return createQuery({
+    queryKey: qk.adminPlaybackErrors(resolved),
+    queryFn: () => listAdminPlaybackErrors(resolved),
+    staleTime: 30_000
+  });
+}
+
 // Admin cover art ---------------------------------------------------------
 
 export type RefetchAlbumCoverResponse = {