feat(search): queue pasted share links from Live Search and mobile search

Implement share-link detection in search (track, queue, album, artist,
composer): enqueue tracks/queues without interrupting playback; preview
album/artist/composer without switching the active server; queue preview
modal with scrollable track list. Based on community PR #551.

Co-authored-by: Daniel Wagner <daniel.iuser@icloud.com>

src/hooks/useShareQueuePreview.ts

@@ -0,0 +1,56 @@
+import { useEffect, useState } from 'react';
+import type { SubsonicSong } from '../api/subsonicTypes';
+import {
+  resolveShareSearchPayload,
+  type ShareSearchResolveResult,
+} from '../utils/share/enqueueShareSearchPayload';
+import type { QueueableShareSearchPayload } from '../utils/share/shareSearch';
+
+export type ShareQueuePreviewState =
+  | { status: 'idle' }
+  | { status: 'loading' }
+  | { status: 'ok'; songs: SubsonicSong[]; total: number; skipped: number }
+  | { status: 'error'; result: Exclude<ShareSearchResolveResult, { type: 'ok' }> };
+
+const IDLE: ShareQueuePreviewState = { status: 'idle' };
+
+export function useShareQueuePreview(
+  payload: Extract<QueueableShareSearchPayload, { k: 'queue' }> | null,
+  open: boolean,
+): ShareQueuePreviewState {
+  const [state, setState] = useState<ShareQueuePreviewState>(IDLE);
+
+  useEffect(() => {
+    if (!open || !payload) {
+      setState(IDLE);
+      return;
+    }
+
+    let cancelled = false;
+    setState({ status: 'loading' });
+
+    void resolveShareSearchPayload(payload)
+      .then(result => {
+        if (cancelled) return;
+        if (result.type === 'ok') {
+          setState({
+            status: 'ok',
+            songs: result.songs,
+            total: result.total,
+            skipped: result.skipped,
+          });
+          return;
+        }
+        setState({ status: 'error', result });
+      })
+      .catch(() => {
+        if (!cancelled) setState({ status: 'error', result: { type: 'error' } });
+      });
+
+    return () => {
+      cancelled = true;
+    };
+  }, [open, payload]);
+
+  return state;
+}