feat: Placeholder farbig markieren in Freigabe-View und Pair-Modal

Objekt-Placeholder indigo, Wort-Placeholder grün, geleakte ⟦PHn⟧-Tokens rot.

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

src/pages/Publish.jsx

@@ -2,6 +2,7 @@ import { useEffect, useState, useRef, useCallback } from 'react';
 import Layout from '../components/Layout';
 import { apiFetch, apiPost } from '../lib/api';
 import { buildRows } from '../lib/pairRows';
+import PlaceholderText from '../components/PlaceholderText';
 
 const LANGS = [
   { code: 'de', flag: '🇩🇪' },
@@ -124,7 +125,7 @@ function PairRow({ pair, flagged, onToggleFlag, objIndexById, onAssign, assignin
                 const isQuestion = row.label === 'Frage';
                 return (
                   <div key={row.label} className={`${row.color} ${isQuestion ? 'italic' : ''} break-words`}>
-                    {val || <span className="text-red-400 italic not-italic">— {row.label} fehlt —</span>}
+                    {val ? <PlaceholderText text={val} /> : <span className="text-red-400 italic not-italic">— {row.label} fehlt —</span>}
                   </div>
                 );
               })}