fix reorder in virtual buckets, split view tags, editor/preview cleanup

- Fix card drag reorder in favorites/journal/current (filter logic
  now mirrors renderBoard)
- Split view shows tag-matched cards as own group alongside related
- Remove extract/tree-view buttons from detail preview (edit-only)
- Context menu tag input: Enter assigns tag directly
- Tag autocomplete closes on ESC/click-outside globally
- Close modal cleans up both autocomplete popups

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

public/index.php

@@ -720,12 +720,6 @@ if (str_starts_with($route, '/api/')) {
                     <button id="detail-delete" class="flex items-center gap-1.5 px-2.5 py-1 text-xs border border-t-border text-t-muted hover:border-t-danger hover:text-t-danger transition-colors">
                         <i class="ph ph-trash text-sm"></i><span class="font-pixel text-[10px]">del</span>
                     </button>
-                    <button id="detail-extract" class="flex items-center gap-1.5 px-2.5 py-1 text-xs border border-t-border text-t-muted hover:border-t-accent hover:text-t-accent transition-colors" title="extract selection to new card">
-                        <i class="ph ph-arrow-square-out text-sm"></i>
-                    </button>
-                    <button id="detail-tree" class="flex items-center gap-1.5 px-2.5 py-1 text-xs border border-t-border text-t-muted hover:border-t-accent hover:text-t-accent transition-colors" title="tree view">
-                        <i class="ph ph-tree-structure text-sm"></i>
-                    </button>
                     <button id="detail-zen" class="flex items-center gap-1.5 px-2.5 py-1 text-xs border border-t-border text-t-muted hover:border-t-accent hover:text-t-accent transition-colors" title="zen mode">
                         <i class="ph ph-corners-out text-sm"></i>
                     </button>