feat: lesbares Placeholder-Format {1.Hund} in Pair-Textfeldern

- Textarea zeigt {1.Hund} (Index + Wort), Directus speichert {uuid.uuid}
- displayToStorage / storageToDisplay Konvertierung bei Save und Edit
- PreviewText-Komponente: Placeholder farblich hervorgehoben (blau)
- Chip-Klick fügt {1.Hund} an Cursor-Position ein
- startEdit konvertiert gespeicherte UUIDs zurück zu lesbarem Format

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

frontend/src/pages/GenerateIt.tsx

@@ -29,6 +29,44 @@ const ChevronRightIcon = () => (
   </svg>
 )
 
+// ── Placeholder helpers ───────────────────────────────────────────────────────
+
+// Display format: {1.Hund}  ←→  Storage format: {objectUUID.wordUUID}
+
+function displayToStorage(text: string, chips: ObjectChip[]): string {
+  return text.replace(/\{(\d+)\.([^}]+)\}/g, (match, indexStr, label) => {
+    const chip = chips.find(c => c.objectIndex === parseInt(indexStr) && c.label === label)
+    return chip ? `{${chip.objectId}.${chip.wordId}}` : match
+  })
+}
+
+function storageToDisplay(text: string, chips: ObjectChip[]): string {
+  // UUIDs are long (36 chars with hyphens); display indexes are short numbers
+  return text.replace(/\{([0-9a-f-]{30,})\.([0-9a-f-]{30,})\}/g, (match, objectId, wordId) => {
+    const chip = chips.find(c => c.objectId === objectId && c.wordId === wordId)
+    return chip ? `{${chip.objectIndex}.${chip.label}}` : match
+  })
+}
+
+// Renders text with {index.label} placeholders highlighted in blue
+function PreviewText({ text, chips }: { text: string; chips: ObjectChip[] }) {
+  const display = storageToDisplay(text, chips)
+  const parts = display.split(/(\{\d+\.[^}]+\})/g)
+  return (
+    <span style={{ fontSize: 11, color: 'var(--text-2)', fontStyle: 'italic' }}>
+      {parts.map((part, i) => {
+        const m = part.match(/^\{(\d+)\.([^}]+)\}$/)
+        if (m) return (
+          <mark key={i} style={{ background: '#dbeafe', color: '#1e40af', borderRadius: 3, padding: '0 2px', fontStyle: 'normal', fontWeight: 600 }}>
+            {m[2]}
+          </mark>
+        )
+        return <span key={i}>{part}</span>
+      })}
+    </span>
+  )
+}
+
 // ── PairForm ──────────────────────────────────────────────────────────────────
 
 interface PairFormProps {
@@ -41,8 +79,8 @@ interface PairFormProps {
 
 function PairForm({ objectId, token, objectChips, onSaved, onCancel }: PairFormProps) {
   const [level, setLevel] = useState(50)
-  const [questionDe, setQuestionDe] = useState('')
-  const [statementDe, setStatementDe] = useState('')
+  const [questionDe, setQuestionDe] = useState('')  // display format: {1.Hund}
+  const [statementDe, setStatementDe] = useState('') // display format: {1.Hund}
   const [saving, setSaving] = useState(false)
   const [error, setError] = useState('')
 
@@ -50,19 +88,14 @@ function PairForm({ objectId, token, objectChips, onSaved, onCancel }: PairFormP
   const statementRef = useRef<HTMLTextAreaElement>(null)
   const lastFocusedRef = useRef<'question' | 'statement'>('statement')
 
-  const resolveTemplate = (text: string): string =>
-    text.replace(/\{([^.}]+)\.([^}]+)\}/g, (_, oid, wid) => {
-      const chip = objectChips.find(c => c.objectId === oid && c.wordId === wid)
-      return chip ? chip.label : '{?}'
-    })
-
-  const insertAtCursor = (oid: string, wordId: string) => {
+  // Insert display-format placeholder at cursor: {1.Hund}
+  const insertAtCursor = (chip: ObjectChip) => {
     const ref = lastFocusedRef.current === 'question' ? questionRef : statementRef
     const ta = ref.current
     if (!ta) return
     const start = ta.selectionStart ?? ta.value.length
     const end = ta.selectionEnd ?? ta.value.length
-    const placeholder = `{${oid}.${wordId}}`
+    const placeholder = `{${chip.objectIndex}.${chip.label}}`
     const newVal = ta.value.slice(0, start) + placeholder + ta.value.slice(end)
     if (lastFocusedRef.current === 'question') setQuestionDe(newVal)
     else setStatementDe(newVal)
@@ -73,13 +106,14 @@ function PairForm({ objectId, token, objectChips, onSaved, onCancel }: PairFormP
   }
 
   const handleSave = async () => {
-    if (!statementDe.trim()) { setError('Aussage (statement_de) ist Pflicht.'); return }
+    if (!statementDe.trim()) { setError('Aussage ist Pflicht.'); return }
     setSaving(true)
     setError('')
     try {
+      // Convert display format → storage format (UUIDs) before saving
       await createDbPair(objectId, {
-        question_de: questionDe.trim() || undefined,
-        statement_de: statementDe.trim(),
+        question_de: questionDe.trim() ? displayToStorage(questionDe.trim(), objectChips) : undefined,
+        statement_de: displayToStorage(statementDe.trim(), objectChips),
         level,
         words: [],
       }, token)
@@ -112,7 +146,7 @@ function PairForm({ objectId, token, objectChips, onSaved, onCancel }: PairFormP
           <div style={{ display: 'flex', flexWrap: 'wrap', gap: 4 }}>
             {objectChips.map(chip => (
               <button key={`${chip.objectId}.${chip.wordId}`} type="button"
-                onClick={() => insertAtCursor(chip.objectId, chip.wordId)}
+                onClick={() => insertAtCursor(chip)}
                 style={{
                   padding: '2px 7px', borderRadius: 'var(--r-full)', fontSize: 11,
                   border: '1px solid #93c5fd', cursor: 'pointer',
@@ -137,7 +171,7 @@ function PairForm({ objectId, token, objectChips, onSaved, onCancel }: PairFormP
           onChange={e => setQuestionDe(e.target.value)}
           onFocus={() => { lastFocusedRef.current = 'question' }}
           rows={2}
-          placeholder="question_de…"
+          placeholder="z.B. Was ist das? oder: Was macht {1.Hund}?"
           style={{
             width: '100%', resize: 'vertical', padding: '6px 8px',
             borderRadius: 'var(--r-sm)', border: '1px solid var(--border)',
@@ -145,11 +179,7 @@ function PairForm({ objectId, token, objectChips, onSaved, onCancel }: PairFormP
             fontFamily: 'var(--font)', fontSize: 12, boxSizing: 'border-box',
           }}
         />
-        {questionDe && (
-          <p style={{ fontSize: 11, color: 'var(--text-2)', marginTop: 2, fontStyle: 'italic' }}>
-            {resolveTemplate(questionDe)}
-          </p>
-        )}
+        {questionDe && <div style={{ marginTop: 3 }}><PreviewText text={questionDe} chips={objectChips} /></div>}
       </div>
 
       {/* Statement (required) */}
@@ -163,7 +193,7 @@ function PairForm({ objectId, token, objectChips, onSaved, onCancel }: PairFormP
           onChange={e => setStatementDe(e.target.value)}
           onFocus={() => { lastFocusedRef.current = 'statement' }}
           rows={2}
-          placeholder="statement_de…"
+          placeholder="z.B. Das ist ein {1.Hund}."
           style={{
             width: '100%', resize: 'vertical', padding: '6px 8px',
             borderRadius: 'var(--r-sm)', border: `1px solid ${statementDe.trim() ? 'var(--border)' : 'var(--danger)'}`,
@@ -171,11 +201,7 @@ function PairForm({ objectId, token, objectChips, onSaved, onCancel }: PairFormP
             fontFamily: 'var(--font)', fontSize: 12, boxSizing: 'border-box',
           }}
         />
-        {statementDe && (
-          <p style={{ fontSize: 11, color: 'var(--text-2)', marginTop: 2, fontStyle: 'italic' }}>
-            {resolveTemplate(statementDe)}
-          </p>
-        )}
+        {statementDe && <div style={{ marginTop: 3 }}><PreviewText text={statementDe} chips={objectChips} /></div>}
       </div>
 
       {error && <div style={{ fontSize: 11, color: 'var(--danger)' }}>{error}</div>}
@@ -218,19 +244,14 @@ function PairsList({ pairs, loading, objectId, token, objectChips, onRefresh }:
   const editStatementRef = useRef<HTMLTextAreaElement>(null)
   const editLastFocusedRef = useRef<'question' | 'statement'>('statement')
 
-  const resolveTemplate = (text: string): string =>
-    text.replace(/\{([^.}]+)\.([^}]+)\}/g, (_, oid, wid) => {
-      const chip = objectChips.find(c => c.objectId === oid && c.wordId === wid)
-      return chip ? chip.label : '{?}'
-    })
-
-  const insertAtCursor = (oid: string, wordId: string) => {
+  // Insert display-format placeholder at cursor: {1.Hund}
+  const insertAtCursor = (chip: ObjectChip) => {
     const ref = editLastFocusedRef.current === 'question' ? editQuestionRef : editStatementRef
     const ta = ref.current
     if (!ta) return
     const start = ta.selectionStart ?? ta.value.length
     const end = ta.selectionEnd ?? ta.value.length
-    const placeholder = `{${oid}.${wordId}}`
+    const placeholder = `{${chip.objectIndex}.${chip.label}}`
     const newVal = ta.value.slice(0, start) + placeholder + ta.value.slice(end)
     if (editLastFocusedRef.current === 'question') setEditQuestion(newVal)
     else setEditStatement(newVal)
@@ -243,8 +264,9 @@ function PairsList({ pairs, loading, objectId, token, objectChips, onRefresh }:
   const startEdit = (pair: DbPair) => {
     setEditingId(pair.id)
     setEditLevel(pair.level)
-    setEditStatement(pair.statements[0]?.statement_de ?? '')
-    setEditQuestion(pair.questions[0]?.question_de ?? '')
+    // Convert storage format (UUIDs) → display format ({1.Hund}) for editing
+    setEditStatement(storageToDisplay(pair.statements[0]?.statement_de ?? '', objectChips))
+    setEditQuestion(storageToDisplay(pair.questions[0]?.question_de ?? '', objectChips))
   }
 
   const saveEdit = async () => {
@@ -253,8 +275,9 @@ function PairsList({ pairs, loading, objectId, token, objectChips, onRefresh }:
     try {
       await updateDbPair(editingId, {
         level: editLevel,
-        statement_de: editStatement,
-        question_de: editQuestion,
+        // Convert display format → storage format (UUIDs) before saving
+        statement_de: displayToStorage(editStatement, objectChips),
+        question_de: editQuestion.trim() ? displayToStorage(editQuestion, objectChips) : '',
       }, token)
       setEditingId(null)
       onRefresh()
@@ -302,7 +325,7 @@ function PairsList({ pairs, loading, objectId, token, objectChips, onRefresh }:
                   <div style={{ display: 'flex', flexWrap: 'wrap', gap: 4 }}>
                     {objectChips.map(chip => (
                       <button key={`${chip.objectId}.${chip.wordId}`} type="button"
-                        onClick={() => insertAtCursor(chip.objectId, chip.wordId)}
+                        onClick={() => insertAtCursor(chip)}
                         style={{
                           padding: '2px 7px', borderRadius: 'var(--r-full)', fontSize: 11,
                           border: '1px solid #93c5fd', cursor: 'pointer',
@@ -325,11 +348,7 @@ function PairsList({ pairs, loading, objectId, token, objectChips, onRefresh }:
                 placeholder="Aussage (Pflicht)…"
                 style={{ width: '100%', padding: '5px 8px', borderRadius: 'var(--r-sm)', border: '1px solid var(--border)', background: 'var(--surface-2)', color: 'var(--text-1)', fontSize: 12, resize: 'vertical', boxSizing: 'border-box' }}
               />
-              {editStatement && (
-                <p style={{ fontSize: 11, color: 'var(--text-2)', marginTop: -4, fontStyle: 'italic' }}>
-                  {resolveTemplate(editStatement)}
-                </p>
-              )}
+              {editStatement && <div style={{ marginTop: 2 }}><PreviewText text={editStatement} chips={objectChips} /></div>}
               <textarea
                 ref={editQuestionRef}
                 value={editQuestion}
@@ -339,11 +358,7 @@ function PairsList({ pairs, loading, objectId, token, objectChips, onRefresh }:
                 placeholder="Frage (optional)…"
                 style={{ width: '100%', padding: '5px 8px', borderRadius: 'var(--r-sm)', border: '1px solid var(--border)', background: 'var(--surface-2)', color: 'var(--text-1)', fontSize: 12, resize: 'vertical', boxSizing: 'border-box' }}
               />
-              {editQuestion && (
-                <p style={{ fontSize: 11, color: 'var(--text-2)', marginTop: -4, fontStyle: 'italic' }}>
-                  {resolveTemplate(editQuestion)}
-                </p>
-              )}
+              {editQuestion && <div style={{ marginTop: 2 }}><PreviewText text={editQuestion} chips={objectChips} /></div>}
 
               <div style={{ display: 'flex', gap: 4 }}>
                 <button className="btn-primary btn-sm" style={{ flex: 1 }} onClick={saveEdit} disabled={saving || !editStatement.trim()}>
@@ -371,12 +386,14 @@ function PairsList({ pairs, loading, objectId, token, objectChips, onRefresh }:
               </div>
               {pair.statements.map(s => (
                 <div key={s.id} style={{ fontSize: 12, color: 'var(--text-1)', marginBottom: 3, paddingLeft: 4 }}>
-                  <span style={{ fontSize: 10, color: 'var(--text-2)', marginRight: 4 }}>Aussage:</span>{resolveTemplate(s.statement_de)}
+                  <span style={{ fontSize: 10, color: 'var(--text-2)', marginRight: 4 }}>Aussage:</span>
+                  <PreviewText text={s.statement_de} chips={objectChips} />
                 </div>
               ))}
               {pair.questions.map(q => (
-                <div key={q.id} style={{ fontSize: 12, color: 'var(--text-2)', fontStyle: 'italic', paddingLeft: 4 }}>
-                  <span style={{ fontSize: 10, marginRight: 4, fontStyle: 'normal' }}>Frage:</span>{resolveTemplate(q.question_de)}
+                <div key={q.id} style={{ fontSize: 12, paddingLeft: 4 }}>
+                  <span style={{ fontSize: 10, color: 'var(--text-2)', marginRight: 4 }}>Frage:</span>
+                  <PreviewText text={q.question_de} chips={objectChips} />
                 </div>
               ))}
             </>