feat(web): drop "Remove from library" from the track kebab

No single-click destructive action belongs in the kebab. Removing the item
orphaned its whole path (RemoveTrackPopover was its only caller, and the
admin/tracks API client was the popover's only caller), so per the repo's
no-dead-code convention the chain is fully removed: the menu item + its
admin/isAdmin plumbing in TrackMenu, RemoveTrackPopover(.svelte/.test),
src/lib/api/admin/tracks(.ts/.test), and the now-needless transitive mocks
in the CompactTrackCard / PlaylistTrackRow / playlist specs.

The kebab is now an 8-item, admin-agnostic menu. The DELETE /api/admin/tracks
server endpoint is untouched — a future safer admin surface can rebind it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/lib/components/TrackMenu.svelte

@@ -10,17 +10,14 @@
     Disc3,
     User,
     EyeOff,
-    Eye,
-    Trash2
+    Eye
   } from 'lucide-svelte';
   import { goto } from '$app/navigation';
   import { useQueryClient } from '@tanstack/svelte-query';
   import FlagPopover from './FlagPopover.svelte';
-  import RemoveTrackPopover from './RemoveTrackPopover.svelte';
   import AddToPlaylistMenu from './AddToPlaylistMenu.svelte';
   import TrackMenuItem from './TrackMenuItem.svelte';
   import TrackMenuDivider from './TrackMenuDivider.svelte';
-  import { user } from '$lib/auth/store.svelte';
   import { createLikedIdsQuery, likeEntity, unlikeEntity } from '$lib/api/likes';
   import { createMyQuarantineQuery, unflagTrack } from '$lib/api/quarantine';
   import { qk } from '$lib/api/queries';
@@ -44,7 +41,6 @@
 
   let menuOpen = $state(false);
   let flagOpen = $state(false);
-  let removeOpen = $state(false);
   let addOpen = $state(false);
 
   const queryClient = useQueryClient();
@@ -63,8 +59,6 @@
     return rows.some((r) => r.track_id === track.id);
   });
 
-  const isAdmin = $derived(user.value?.is_admin === true);
-
   function toggleMenu(e: MouseEvent) {
     e.stopPropagation();
     menuOpen = !menuOpen;
@@ -73,7 +67,6 @@
   function closeAll() {
     menuOpen = false;
     flagOpen = false;
-    removeOpen = false;
     addOpen = false;
   }
 
@@ -124,13 +117,8 @@
     goto(`/artists/${track.artist_id}`);
   }
 
-  function onRemoveOpen() {
-    menuOpen = false;
-    removeOpen = true;
-  }
-
   function onKeydown(e: KeyboardEvent) {
-    if (!menuOpen && !flagOpen && !removeOpen && !addOpen) return;
+    if (!menuOpen && !flagOpen && !addOpen) return;
     if (e.key === 'Escape') {
       e.preventDefault();
       closeAll();
@@ -166,8 +154,8 @@
            add-to-playlist / start-radio group → navigation group → hide.
            "Start radio" is shown even under hideQueueActions (reseeding a
            station from the current track is meaningful where play-next /
-           add-to-queue are not). The admin-only "Remove from library" is a
-           web superset Android has no surface for — kept past the divider. -->
+           add-to-queue are not). No single-click destructive action lives
+           here — track removal is intentionally kept out of the kebab. -->
       {#if !hideQueueActions}
         <TrackMenuItem icon={ListVideo} label="Play next" onclick={onPlayNext} />
         <TrackMenuItem icon={ListMusic} label="Add to queue" onclick={onAddToQueue} />
@@ -199,15 +187,6 @@
         label={hidden ? 'Unhide' : 'Hide'}
         onclick={onToggleHide}
       />
-      {#if isAdmin}
-        <TrackMenuDivider />
-        <TrackMenuItem
-          icon={Trash2}
-          label="Remove from library"
-          onclick={onRemoveOpen}
-          danger
-        />
-      {/if}
     </div>
   {/if}
 
@@ -215,10 +194,6 @@
     <FlagPopover {track} onClose={closeAll} />
   {/if}
 
-  {#if removeOpen}
-    <RemoveTrackPopover {track} onClose={closeAll} />
-  {/if}
-
   {#if addOpen}
     <AddToPlaylistMenu tracks={[track]} onClose={() => (addOpen = false)} />
   {/if}