fix: button focus ring, playlist reorder mode, edit modal mobile, backdrop-filter

- button:focus{outline:none} — removes the blue tap-highlight box in WebView
- Playlist reorder: replaced always-on drag handles with explicit 'Neu anordnen'
  mode. Handles only appear after tapping the button; a sticky Speichern/Abbrechen
  bar appears above the list. Touch drag is now fully supported. Context-menu
  (long-press) is blocked while reorder mode is active to prevent conflicts.
- styles.css: .pl-drag-handle always visible when pl-draggable (no hover needed)
- Edit modal footer: wrap buttons on small screens so Save doesn't overflow
- Edit modal overlay: remove backdrop-filter:blur — causes WebView compositor
  glitch where 3/4 of the modal disappears after returning from background

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/main.js

@@ -16,6 +16,7 @@ import {
   onGlobalSearch, s_goArtist, s_goAlbum, playerBarGoArtist, playerBarGoAlbum,
   searchSimilarArtist, searchAndPreview, loadItunesAlbum, expandArtistBio,
   loadAlbums, loadStarred, loadRandom, filterStarred, filterPlaylist,
+  plReorderEnter, plReorderSave, plReorderCancel,
 } from './views.js';
 import { loadSpotifyImporter, resolveSpotifyLink, clearSpotifyPreview, spotifyDlAll } from './spotify.js';
 import {
@@ -282,7 +283,9 @@ Object.assign(window, {
   openSettings, closeSettings, saveSettings, confirmDisconnect, checkBackend,
   openSidebar, closeSidebar, switchNavMode, showCtxMenu,
   // Views
-  loadAlbums, loadStarred, loadRandom, filterStarred, filterPlaylist, loadSpotifyImporter, resolveSpotifyLink, clearSpotifyPreview, spotifyDlAll,
+  loadAlbums, loadStarred, loadRandom, filterStarred, filterPlaylist,
+  plReorderEnter, plReorderSave, plReorderCancel,
+  loadSpotifyImporter, resolveSpotifyLink, clearSpotifyPreview, spotifyDlAll,
   executeSpotifyDownload,
   openPlModal, closePlModal, addSongsToPlaylist, createAndAddPlaylist, createPlaylistPrompt,
   showSongInfo, closeInfoModal,