feat(web): merge Song Importer into Global Suche (one unified field)

The importer no longer has its own sidebar/bottom-nav entry. The Global
Suche field now handles both jobs: plain text runs the Deezer search;
a pasted Spotify/SoundCloud/YouTube link switches into importer mode
(badge + "Importieren" button + preview), matching the Android app and
tidying the left nav.

- New onGlobalInput/tryImporterResolve; importer DOM moved into
  page-discover; old page-spotify-importer removed; routing cleaned up.
- Existing resolvers unchanged (still read the mirrored importer-link-input).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/views/navigation.js

@@ -62,12 +62,12 @@ export function navigate(page, data=null) {
   closeHeaderSearch();
   document.querySelectorAll('.page').forEach(p => p.classList.remove('active'));
   document.querySelectorAll('.nav-item,.bnav-item').forEach(n => n.classList.remove('active','active-blue'));
-  const cls = ['discover','new-releases','recommendations','spotify-importer'].includes(page) ? 'active-blue' : 'active';
+  const cls = ['discover','new-releases','recommendations'].includes(page) ? 'active-blue' : 'active';
   document.querySelectorAll(`[data-page="${page}"]`).forEach(el => el.classList.add(cls));
   const pageEl = document.getElementById(`page-${page}`);
   if(pageEl) { pageEl.classList.add('active'); document.getElementById('main-content').scrollTop = 0; }
   closeSidebar();
-  if(['discover','new-releases','recommendations','random','spotify-importer'].includes(page)) switchNavMode('discover');
+  if(['discover','new-releases','recommendations','random'].includes(page)) switchNavMode('discover');
   else if(['home','artists','albums','starred','playlists'].includes(page)) switchNavMode('library');
 
   if(page==='home')    loadHomeData(!S._navJumping); // explicit Home click refreshes; back/forward keeps state
@@ -85,7 +85,6 @@ export function navigate(page, data=null) {
   if(page==='playlists')     loadPlaylists();
   if(page==='playlist-detail' && data) loadPlaylistDetail(data);
   if(page==='recommendations')  loadRecommendations();
-  if(page==='spotify-importer') { loadSpotifyImporter(); loadSoundCloudImporter(); }
   if(page==='audiobooks') {
     import('./abs.js').then(m => {
       if (S.abs.currentLibraryId) m.loadAbsBooks(S.abs.currentLibraryId);

src/views/spotify.js

@@ -47,6 +47,50 @@ export function onImporterInput(val) {
   }
 }
 
+// ─── UNIFIED GLOBAL-SUCHE FIELD ───
+// One field on the Global-Suche page handles both jobs: a pasted Spotify/SoundCloud/YouTube link
+// switches into the importer flow; any other text runs the Deezer library search. This replaces the
+// separate "Song Importer" sidebar entry (the importer now lives inside Global Suche).
+const _IMPORT_LINK_RE = /^https?:\/\//i;
+const _IMPORT_HOST_RE = /(?:spotify\.com|soundcloud\.com|youtube\.com|youtu\.be)/i;
+function _isImportLink(v) { return _IMPORT_LINK_RE.test(v) || _IMPORT_HOST_RE.test(v); }
+
+export function onGlobalInput(val) {
+  const v = (val || '').trim();
+  const area    = document.getElementById('importer-area');
+  const results  = document.getElementById('global-search-results');
+  const badge   = document.getElementById('importer-badge');
+  const btn     = document.getElementById('importer-btn');
+  if (_isImportLink(v)) {
+    // Link → importer mode
+    if (results) results.style.display = 'none';
+    if (area)    area.style.display    = '';
+    if (badge)   badge.style.display   = '';
+    if (btn)     btn.style.display     = '';
+    const hidden = document.getElementById('importer-link-input');
+    if (hidden) hidden.value = v;            // mirror so resolveImporterLink() reads it
+    onImporterInput(v);                      // badge styling + clear stale previews
+    const hint = document.getElementById('importer-hint');
+    if (hint) hint.style.display = '';       // keep the platform hint as a header until a preview loads
+  } else {
+    // Text → Deezer search
+    if (area)  area.style.display  = 'none';
+    if (badge) badge.style.display = 'none';
+    if (btn)   btn.style.display   = 'none';
+    if (results) results.style.display = '';
+    window.onGlobalSearch(v);
+  }
+}
+
+// Enter in the unified field: resolve the link if it is one (search is already live via oninput).
+export function tryImporterResolve() {
+  const v = (document.getElementById('global-search-input')?.value || '').trim();
+  if (!_isImportLink(v)) return;
+  const hidden = document.getElementById('importer-link-input');
+  if (hidden) hidden.value = v;
+  resolveImporterLink();
+}
+
 export async function resolveImporterLink() {
   const url = document.getElementById('importer-link-input')?.value.trim();
   if (!url) return;