fix(web): move {@const} blocks to immediate children of {#each}

Svelte 5 requires {@const} to be a direct child of certain blocks
({#snippet}, {#if}, {#each}, etc.). Placing them inside <li>
bodies broke the build with const_tag_invalid_placement. Moved
the RowAction const declarations up so they sit between {#each}
and the <li> opener; the each-binding (u/r) is in scope for the
entire each block body, so the consts behave identically.

Caught by local docker build on dev:
  src/routes/admin/users/+page.svelte:259:12
  https://svelte.dev/e/const_tag_invalid_placement

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/src/routes/admin/quarantine/+page.svelte

@@ -181,6 +181,11 @@
       {#each rows as r (r.track_id)}
         {@const isExpanded = !!expanded[r.track_id]}
         {@const lidarrDisabled = !r.lidarr_album_mbid}
+        {@const primary: RowAction = { icon: RotateCcw, label: 'Resolve', onclick: () => onResolve(r) }}
+        {@const secondary: RowAction[] = [
+          { icon: Play, label: 'Play', onclick: () => onPlay(r) },
+          { icon: Trash2, label: 'Delete file', onclick: () => openDeleteFile(r), danger: true }
+        ]}
         <li
           class="flex items-start gap-4 p-3"
           data-testid="admin-quarantine-row"
@@ -259,11 +264,6 @@
           </div>
 
           <!-- Action cluster -->
-          {@const primary: RowAction = { icon: RotateCcw, label: 'Resolve', onclick: () => onResolve(r) }}
-          {@const secondary: RowAction[] = [
-            { icon: Play, label: 'Play', onclick: () => onPlay(r) },
-            { icon: Trash2, label: 'Delete file', onclick: () => openDeleteFile(r), danger: true }
-          ]}
           <div class="flex shrink-0 items-center gap-2">
             <RowActionsMenu {primary} {secondary} />