feat: rework PairForm — 3 checkboxes, validation logic, word pickers

Replaces the answer_type dropdown with 3 independent checkboxes:
- Text: positive statement required; negative requires question+positive;
  question is optional standalone; auto-detects words + {{uuid}} placeholders
- Ja/Nein: addon, adds answer field (null/true/false) to positive statement
- Wort: opens positive/negative word pickers → linked via statement_positive/negative_words

Validation rules:
- At least one type must be checked
- Text: positive statement non-empty
- Negative statement only allowed when question + positive both filled

Word creation: highlight text in any field → 'Als Wort erstellen' button

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/pages/StatementCreation.jsx

@@ -78,31 +78,119 @@ function HighlightedTextarea({ value, onChange, wordMap, rows = 3, placeholder,
   );
 }
 
-// ─── PairForm ─────────────────────────────────────────────────────────────────
-function PairForm({ objectId, onPairSaved, onCancel }) {
+// ─── WordSearch (for word pickers) ───────────────────────────────────────────
+function WordSearch({ existingIds = [], onAdd, placeholder = 'Wort suchen…' }) {
+  const lang = getUserLang();
+  const [q, setQ] = useState('');
+  const [results, setResults] = useState([]);
+  const [open, setOpen] = useState(false);
+  const [creating, setCreating] = useState(false);
+  const ref = useRef(null);
+
+  useEffect(() => {
+    if (!q.trim()) { setResults([]); return; }
+    const t = setTimeout(async () => {
+      try {
+        const data = await apiFetch(`/words?search=${encodeURIComponent(q.trim())}&limit=10`);
+        setResults(Array.isArray(data) ? data.filter(w => !existingIds.includes(w.id)) : []);
+      } catch {}
+    }, 300);
+    return () => clearTimeout(t);
+  }, [q, existingIds]);
+
+  useEffect(() => {
+    function out(e) { if (ref.current && !ref.current.contains(e.target)) setOpen(false); }
+    document.addEventListener('mousedown', out);
+    return () => document.removeEventListener('mousedown', out);
+  }, []);
+
+  async function handleCreate() {
+    setCreating(true);
+    try {
+      const w = await apiPost('/words', { [`titel_${lang}`]: q.trim() });
+      onAdd(w); setQ(''); setResults([]); setOpen(false);
+    } catch (e) { alert('Fehler: ' + e.message); }
+    finally { setCreating(false); }
+  }
+
+  return (
+    <div ref={ref} className="relative">
+      <input
+        type="text" value={q}
+        onChange={e => { setQ(e.target.value); setOpen(true); }}
+        onFocus={() => setOpen(true)}
+        placeholder={placeholder}
+        className="w-full border border-slate-300 rounded-lg px-2.5 py-1.5 text-xs focus:outline-none focus:ring-2 focus:ring-indigo-400 bg-white"
+      />
+      {open && q.trim() && (
+        <div className="absolute z-30 left-0 right-0 mt-1 bg-white border border-slate-200 rounded-lg shadow-lg overflow-hidden max-h-36 overflow-y-auto">
+          {results.map(w => (
+            <button key={w.id} onMouseDown={e => e.preventDefault()}
+              onClick={() => { onAdd(w); setQ(''); setResults([]); setOpen(false); }}
+              className="w-full text-left px-3 py-1.5 text-xs hover:bg-indigo-50 hover:text-indigo-700 border-b border-slate-100 last:border-0"
+            >
+              {w.titel_de || w.id}{w.titel_en && <span className="text-slate-400 ml-1">({w.titel_en})</span>}
+            </button>
+          ))}
+          {results.length === 0 && (
+            <button onMouseDown={e => e.preventDefault()} onClick={handleCreate} disabled={creating}
+              className="w-full text-left px-3 py-1.5 text-xs text-indigo-600 hover:bg-indigo-50 font-medium"
+            >
+              {creating ? 'Erstelle…' : `+ „${q.trim()}" neu erstellen`}
+            </button>
+          )}
+        </div>
+      )}
+    </div>
+  );
+}
+
+function WordTag({ word, onRemove }) {
+  return (
+    <span className="inline-flex items-center gap-1 text-xs bg-indigo-50 text-indigo-700 rounded-full pl-2 pr-1 py-0.5 font-medium">
+      {word.titel_de || word.id}
+      <button onClick={() => onRemove(word.id)}
+        className="text-indigo-300 hover:text-red-500 rounded-full w-3.5 h-3.5 flex items-center justify-center">×</button>
+    </span>
+  );
+}
+
+// ─── PairForm ─────────────────────────────────────────────────────────────────
+function PairForm({ objectId, onPairSaved }) {
   const lang = getUserLang();
-  const [answerType, setAnswerType] = useState('word');
   const [showForm, setShowForm] = useState(false);
+
+  // Type checkboxes
+  const [typeText, setTypeText] = useState(false);
+  const [typeYesNo, setTypeYesNo] = useState(false);
+  const [typeWord, setTypeWord] = useState(false);
+
+  // Text fields
   const [question, setQuestion] = useState('');
   const [positive, setPositive] = useState('');
   const [negative, setNegative] = useState('');
-  const [wordMap, setWordMap] = useState({});   // { 'hund': {id, titel_de, ...} }
+  const [wordMap, setWordMap] = useState({});
   const [selection, setSelection] = useState('');
-  const [saving, setSaving] = useState(false);
   const [creatingWord, setCreatingWord] = useState(false);
 
-  // Auto-detect words in all three fields combined
-  const allText = `${question} ${positive} ${negative}`;
+  // Yes/No answer
+  const [yesNoAnswer, setYesNoAnswer] = useState(null); // null | true | false
 
+  // Word pickers
+  const [positiveWords, setPositiveWords] = useState([]);
+  const [negativeWords, setNegativeWords] = useState([]);
+
+  const [saving, setSaving] = useState(false);
+
+  // Auto-detect words from text fields (only when Text type active)
+  const allText = typeText ? `${question} ${positive} ${negative}` : '';
   useEffect(() => {
+    if (!allText.trim()) { setWordMap({}); return; }
     const t = setTimeout(async () => {
-      const words = [...new Set(
-        allText.split(/[\s.,!?;:()\[\]"']+/).filter(w => w.length >= 2)
-      )];
-      if (!words.length) return;
-
+      const tokens = [...new Set(allText.split(/[\s.,!?;:()\[\]"']+/).filter(w => w.length >= 2))];
+      if (!tokens.length) return;
       const results = await Promise.allSettled(
-        words.map(w =>
+        tokens.map(w =>
           apiFetch(`/words?titel_${lang}=${encodeURIComponent(w)}&limit=1`)
             .then(d => Array.isArray(d) && d.length ? { key: w.toLowerCase(), word: d[0] } : null)
         )
@@ -118,151 +206,251 @@ function PairForm({ objectId, onPairSaved, onCancel }) {
     if (!selection.trim()) return;
     setCreatingWord(true);
     try {
-      const body = { [`titel_${lang}`]: selection.trim() };
-      const w = await apiPost('/words', body);
+      const w = await apiPost('/words', { [`titel_${lang}`]: selection.trim() });
       setWordMap(prev => ({ ...prev, [selection.trim().toLowerCase()]: w }));
     } catch (e) { alert('Fehler: ' + e.message); }
     finally { setCreatingWord(false); }
   }
 
+  // Validation
+  const atLeastOne = typeText || typeYesNo || typeWord;
+  const textOk = !typeText || positive.trim().length > 0;
+  const negativeOk = !negative.trim() || (question.trim().length > 0 && positive.trim().length > 0);
+  const canSave = atLeastOne && textOk && negativeOk;
+
+  function validationHint() {
+    if (!atLeastOne) return 'Wähle mindestens einen Typ (Text / Ja·Nein / Wort).';
+    if (!textOk) return 'Text: Positive Aussage ist Pflicht.';
+    if (!negativeOk) return 'Negative Aussage erfordert Frage + Positive Aussage.';
+    return '';
+  }
+
+  function reset() {
+    setTypeText(false); setTypeYesNo(false); setTypeWord(false);
+    setQuestion(''); setPositive(''); setNegative('');
+    setWordMap({}); setYesNoAnswer(null);
+    setPositiveWords([]); setNegativeWords([]);
+    setShowForm(false);
+  }
+
   async function handleSave() {
-    if (!question.trim() || !positive.trim() || !negative.trim()) {
-      alert('Bitte alle drei Felder ausfüllen.');
-      return;
-    }
+    if (!canSave) return;
     setSaving(true);
     try {
-      const qField = `sentence_${lang}`;
-      const posProcField = `positive_sentence_${lang}`;
-      const negProcField = `negative_sentence_${lang}`;
+      const answerTypes = [
+        ...(typeText   ? ['text']   : []),
+        ...(typeYesNo  ? ['yes_no'] : []),
+        ...(typeWord   ? ['word']   : []),
+      ];
 
-      // Insert word placeholders
-      const qProcessed   = withPlaceholders(question,  wordMap);
-      const posProcessed = withPlaceholders(positive,  wordMap);
-      const negProcessed = withPlaceholders(negative,  wordMap);
+      // Question (only if Text + question text filled)
+      let questionId = null;
+      if (typeText && question.trim()) {
+        const q = await apiPost('/questions', {
+          [`sentence_${lang}`]: withPlaceholders(question, wordMap),
+          status: 'draft',
+        });
+        questionId = q.id;
+      }
 
-      // 1. Create question
-      const q = await apiPost('/questions', { [qField]: qProcessed, status: 'draft' });
+      // Positive statement
+      const posBody = { status: 'draft' };
+      if (typeText && positive.trim())
+        posBody[`positive_sentence_${lang}`] = withPlaceholders(positive, wordMap);
+      if (typeYesNo && yesNoAnswer !== null)
+        posBody.answer = yesNoAnswer;
 
-      // 2. Create positive statement (separate record)
-      const posStmt = await apiPost('/statements', { [posProcField]: posProcessed, status: 'draft' });
+      const posStmt = await apiPost('/statements', posBody);
 
-      // 3. Create negative statement (separate record)
-      const negStmt = await apiPost('/statements', { [negProcField]: negProcessed, status: 'draft' });
+      // Link positive words to positive statement
+      if (typeWord && positiveWords.length)
+        await Promise.all(positiveWords.map(w => apiLink(`/statements/${posStmt.id}/positive-words/${w.id}`)));
 
-      // 4. Create pair
+      // Negative statement (Text + negative text, OR Word + negativeWords)
+      let negStmtId = null;
+      const hasNegText = typeText && negative.trim();
+      const hasNegWords = typeWord && negativeWords.length > 0;
+
+      if (hasNegText || hasNegWords) {
+        const negBody = { status: 'draft' };
+        if (hasNegText)
+          negBody[`negative_sentence_${lang}`] = withPlaceholders(negative, wordMap);
+        const negStmt = await apiPost('/statements', negBody);
+        negStmtId = negStmt.id;
+        if (hasNegWords)
+          await Promise.all(negativeWords.map(w => apiLink(`/statements/${negStmt.id}/negative-words/${w.id}`)));
+      }
+
+      // Pair
       const pair = await apiPost('/pairs', {
-        answer_type: answerType,
-        question_id: q.id,
+        answer_type: answerTypes,
+        question_id: questionId,
         positive_statement_id: posStmt.id,
-        negative_statement_id: negStmt.id,
+        negative_statement_id: negStmtId,
         status: 'draft',
       });
 
-      // 5. Link pair to object
       await apiLink(`/objects/${objectId}/pairs/${pair.id}`);
 
-      // Reset
-      setQuestion(''); setPositive(''); setNegative('');
-      setWordMap({}); setShowForm(false);
-      onPairSaved({ ...pair, question: q, positive_statement: posStmt, negative_statement: negStmt });
+      reset();
+      onPairSaved({ ...pair, question: questionId ? { [`sentence_${lang}`]: question } : null,
+        positive_statement: posStmt, negative_statement: null });
     } catch (e) { alert('Fehler: ' + e.message); }
     finally { setSaving(false); }
   }
 
   return (
-    <div className="space-y-3">
-      {/* Answer type + toggle button */}
-      <div className="flex items-center gap-2">
-        <select
-          value={answerType}
-          onChange={e => setAnswerType(e.target.value)}
-          className="border border-slate-300 rounded-lg px-2 py-1.5 text-xs focus:outline-none focus:ring-2 focus:ring-indigo-400 bg-white"
-        >
-          <option value="word">Wort</option>
-          <option value="yes_no">Ja / Nein</option>
-          <option value="text">Text</option>
-        </select>
-        <button
-          onClick={() => setShowForm(s => !s)}
-          className="flex-1 py-1.5 text-xs font-medium rounded-lg bg-indigo-600 hover:bg-indigo-700 text-white transition-colors"
-        >
-          {showForm ? '✕ Abbrechen' : '+ Add new pair'}
-        </button>
-      </div>
+    <div className="space-y-2">
+      {/* Toggle button */}
+      <button
+        onClick={() => setShowForm(s => !s)}
+        className="w-full py-1.5 text-xs font-medium rounded-lg bg-indigo-600 hover:bg-indigo-700 text-white transition-colors"
+      >
+        {showForm ? '✕ Abbrechen' : '+ Add new pair'}
+      </button>
 
       {showForm && (
-        <div className="border border-indigo-100 rounded-xl p-3 bg-indigo-50/40 space-y-3">
-          {/* "Als Wort erstellen" — floating */}
-          {selection && (
-            <div className="flex items-center gap-2 bg-white border border-indigo-200 rounded-lg px-3 py-2">
-              <span className="text-xs text-slate-600 flex-1">
-                Ausgewählt: <strong className="text-indigo-700">„{selection}"</strong>
-              </span>
-              <button
-                onClick={handleCreateWord}
-                disabled={creatingWord}
-                className="text-xs bg-indigo-600 hover:bg-indigo-700 text-white px-2.5 py-1 rounded-lg font-medium disabled:opacity-50"
-              >
-                {creatingWord ? 'Erstelle…' : 'Als Wort erstellen'}
-              </button>
+        <div className="border border-indigo-100 rounded-xl p-3 bg-indigo-50/30 space-y-3">
+
+          {/* ── Type checkboxes ── */}
+          <div className="flex items-center gap-4">
+            {[['typeText', typeText, setTypeText, 'Text'],
+              ['typeYesNo', typeYesNo, setTypeYesNo, 'Ja / Nein'],
+              ['typeWord', typeWord, setTypeWord, 'Wort'],
+            ].map(([key, val, setter, label]) => (
+              <label key={key} className="flex items-center gap-1.5 text-xs font-medium text-slate-700 cursor-pointer select-none">
+                <input
+                  type="checkbox"
+                  checked={val}
+                  onChange={e => setter(e.target.checked)}
+                  className="w-3.5 h-3.5 accent-indigo-600"
+                />
+                {label}
+              </label>
+            ))}
+          </div>
+
+          {/* ── Text section ── */}
+          {typeText && (
+            <div className="space-y-2.5 pt-1 border-t border-indigo-100">
+              {/* "Als Wort erstellen" banner */}
+              {selection && (
+                <div className="flex items-center gap-2 bg-white border border-indigo-200 rounded-lg px-2.5 py-1.5">
+                  <span className="text-xs text-slate-600 flex-1 truncate">
+                    „<strong className="text-indigo-700">{selection}</strong>"
+                  </span>
+                  <button onClick={handleCreateWord} disabled={creatingWord}
+                    className="text-xs bg-indigo-600 hover:bg-indigo-700 text-white px-2 py-0.5 rounded font-medium disabled:opacity-50 whitespace-nowrap">
+                    {creatingWord ? '…' : 'Als Wort erstellen'}
+                  </button>
+                </div>
+              )}
+
+              <div>
+                <label className="block text-xs font-semibold text-slate-500 uppercase tracking-wide mb-1">
+                  Positive Aussage <span className="text-red-400">*</span>
+                </label>
+                <HighlightedTextarea value={positive} onChange={setPositive} wordMap={wordMap}
+                  rows={2} placeholder="Das ist ein Hund." onSelectionChange={setSelection} />
+              </div>
+
+              <div>
+                <label className="block text-xs font-semibold text-slate-500 uppercase tracking-wide mb-1">
+                  Frage <span className="text-slate-300">(optional)</span>
+                </label>
+                <HighlightedTextarea value={question} onChange={setQuestion} wordMap={wordMap}
+                  rows={2} placeholder="Was ist das?" onSelectionChange={setSelection} />
+              </div>
+
+              <div>
+                <label className="block text-xs font-semibold text-slate-500 uppercase tracking-wide mb-1">
+                  Negative Aussage
+                  <span className="text-slate-300 ml-1">(optional — braucht Frage + Positiv)</span>
+                </label>
+                <HighlightedTextarea value={negative} onChange={setNegative} wordMap={wordMap}
+                  rows={2} placeholder="Das ist keine Katze." onSelectionChange={setSelection} />
+                {negative.trim() && !negativeOk && (
+                  <p className="text-xs text-red-500 mt-0.5">Frage + Positive Aussage erforderlich.</p>
+                )}
+              </div>
+
+              {Object.keys(wordMap).length > 0 && (
+                <div className="flex flex-wrap gap-1">
+                  <span className="text-xs text-slate-400 w-full">Erkannte Wörter:</span>
+                  {Object.entries(wordMap).map(([title, w]) => (
+                    <span key={w.id} className="text-xs bg-indigo-100 text-indigo-700 rounded px-1.5 py-0.5">{title}</span>
+                  ))}
+                </div>
+              )}
             </div>
           )}
 
-          <div>
-            <label className="block text-xs font-semibold text-slate-500 uppercase tracking-wide mb-1">Frage</label>
-            <HighlightedTextarea
-              value={question}
-              onChange={setQuestion}
-              wordMap={wordMap}
-              rows={2}
-              placeholder="Was ist das?"
-              onSelectionChange={setSelection}
-            />
-          </div>
-
-          <div>
-            <label className="block text-xs font-semibold text-slate-500 uppercase tracking-wide mb-1">Positive Aussage</label>
-            <HighlightedTextarea
-              value={positive}
-              onChange={setPositive}
-              wordMap={wordMap}
-              rows={2}
-              placeholder="Das ist ein Hund."
-              onSelectionChange={setSelection}
-            />
-          </div>
-
-          <div>
-            <label className="block text-xs font-semibold text-slate-500 uppercase tracking-wide mb-1">Negative Aussage</label>
-            <HighlightedTextarea
-              value={negative}
-              onChange={setNegative}
-              wordMap={wordMap}
-              rows={2}
-              placeholder="Das ist keine Katze."
-              onSelectionChange={setSelection}
-            />
-          </div>
-
-          {Object.keys(wordMap).length > 0 && (
-            <div className="flex flex-wrap gap-1">
-              <span className="text-xs text-slate-400">Erkannte Wörter:</span>
-              {Object.entries(wordMap).map(([title, w]) => (
-                <span key={w.id} className="text-xs bg-indigo-100 text-indigo-700 rounded px-1.5 py-0.5 font-medium">
-                  {title}
-                </span>
-              ))}
+          {/* ── Ja/Nein section ── */}
+          {typeYesNo && (
+            <div className="pt-2 border-t border-indigo-100">
+              <p className="text-xs font-semibold text-slate-500 uppercase tracking-wide mb-2">Antwort</p>
+              <div className="flex gap-2">
+                {[
+                  [null,  '— Offen', 'bg-slate-100 text-slate-600 border-slate-200'],
+                  [true,  '✓ Ja',    'bg-green-50 text-green-700 border-green-300'],
+                  [false, '✗ Nein',  'bg-red-50 text-red-600 border-red-300'],
+                ].map(([val, label, cls]) => (
+                  <button key={String(val)}
+                    onClick={() => setYesNoAnswer(val)}
+                    className={`flex-1 py-1.5 text-xs font-medium rounded-lg border transition-all
+                      ${yesNoAnswer === val ? `${cls} ring-2 ring-offset-1 ring-indigo-400` : 'bg-white text-slate-500 border-slate-200 hover:border-slate-300'}`}
+                  >
+                    {label}
+                  </button>
+                ))}
+              </div>
             </div>
           )}
 
-          <button
-            onClick={handleSave}
-            disabled={saving || !question.trim() || !positive.trim() || !negative.trim()}
-            className="w-full py-2 text-xs font-medium rounded-lg bg-green-600 hover:bg-green-700 disabled:opacity-40 text-white transition-colors"
-          >
-            {saving ? 'Speichern…' : '✓ Pair speichern'}
-          </button>
+          {/* ── Wort section ── */}
+          {typeWord && (
+            <div className="pt-2 border-t border-indigo-100 space-y-2.5">
+              <div>
+                <p className="text-xs font-semibold text-slate-500 uppercase tracking-wide mb-1.5">Positive Wörter</p>
+                <div className="flex flex-wrap gap-1 mb-1.5">
+                  {positiveWords.map(w => (
+                    <WordTag key={w.id} word={w} onRemove={id => setPositiveWords(prev => prev.filter(x => x.id !== id))} />
+                  ))}
+                </div>
+                <WordSearch
+                  existingIds={positiveWords.map(w => w.id)}
+                  onAdd={w => setPositiveWords(prev => prev.some(x => x.id === w.id) ? prev : [...prev, w])}
+                  placeholder="Positives Wort suchen…"
+                />
+              </div>
+
+              <div>
+                <p className="text-xs font-semibold text-slate-500 uppercase tracking-wide mb-1.5">Negative Wörter</p>
+                <div className="flex flex-wrap gap-1 mb-1.5">
+                  {negativeWords.map(w => (
+                    <WordTag key={w.id} word={w} onRemove={id => setNegativeWords(prev => prev.filter(x => x.id !== id))} />
+                  ))}
+                </div>
+                <WordSearch
+                  existingIds={negativeWords.map(w => w.id)}
+                  onAdd={w => setNegativeWords(prev => prev.some(x => x.id === w.id) ? prev : [...prev, w])}
+                  placeholder="Negatives Wort suchen…"
+                />
+              </div>
+            </div>
+          )}
+
+          {/* ── Save ── */}
+          <div className="pt-2 border-t border-indigo-100 space-y-1.5">
+            {!canSave && <p className="text-xs text-amber-600">{validationHint()}</p>}
+            <button
+              onClick={handleSave}
+              disabled={saving || !canSave}
+              className="w-full py-2 text-xs font-medium rounded-lg bg-green-600 hover:bg-green-700 disabled:opacity-40 text-white transition-colors"
+            >
+              {saving ? 'Speichern…' : '✓ Pair speichern'}
+            </button>
+          </div>
         </div>
       )}
     </div>