Put the menu drag handle next to the summary instead of inside it

A button inside a summary is an interactive element in an interactive element; screen
readers announce it unreliably. The handle keeps its look and its mouse, touch and arrow
key behaviour. Also corrects the anchor hints and waits for the menu error in the admin check.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

public/assets/admin.css

@@ -998,3 +998,9 @@ details.card > summary:hover { background: #fafbf8 }
 .term-chip { border: 1px solid var(--line); background: #fff; color: var(--ink); border-radius: 999px; padding: 4px 11px; font-size: 12px; cursor: pointer }
 .term-chip[aria-pressed="true"] { background: #edf4dc; border-color: var(--accent); font-weight: 650 }
 .term-chip[aria-pressed="true"]::before { content: '✓ '; }
+/* Der Ziehknopf eines Menüeintrags liegt über der linken Ecke der Zusammenfassung, gehört aber
+   nicht zu ihr - sonst stünde ein Knopf in einem Knopf. */
+.menu-entry { position: relative }
+.menu-entry > .menu-drag-handle { position: absolute; left: 14px; top: 10px; z-index: 1 }
+.menu-entry summary { padding-left: 58px; min-height: 60px }
+@media (max-width: 560px) { .menu-entry > .menu-drag-handle { left: 8px; top: 8px } .menu-entry summary { padding-left: 50px; min-height: 56px } }