DevTools TextDiff: kein Zeilenumbruch in Textarea, Zeilennummern bleiben korrekt

frontend/src/tools/devtools.jsx

@@ -1009,7 +1009,8 @@ function TextDiff({ mobile }) {
   const changedB = diff ? changedLineNums(diff, 'b') : new Set();
 
   const ta = { ...S.inp, fontSize:12, fontFamily:"'Courier New',monospace", width:'100%',
-    boxSizing:'border-box', minHeight:180, resize:'vertical', lineHeight:'1.6', padding:'7px 8px' };
+    boxSizing:'border-box', minHeight:180, resize:'vertical', lineHeight:'1.6', padding:'7px 8px',
+    whiteSpace:'pre', overflowX:'auto', overflowWrap:'normal' };
 
   function LineNumCol({ text, changedSet }) {
     return (
@@ -1017,9 +1018,10 @@ function TextDiff({ mobile }) {
         padding:'7px 6px', minWidth:36, textAlign:'right', userSelect:'none',
         fontFamily:"'Courier New',monospace", fontSize:12, lineHeight:'1.6',
         background:'rgba(0,0,0,0.2)', borderRight:'1px solid rgba(255,255,255,0.07)',
-        whiteSpace:'pre', flexShrink:0}}>
+        flexShrink:0, overflowY:'hidden'}}>
         {(text||' ').split('\n').map((_,i) => (
           <div key={i} style={{
+            height:'1.6em',
             color: changedSet.has(i+1) ? '#ff6b9d' : 'rgba(255,255,255,0.25)',
             background: changedSet.has(i+1) ? 'rgba(255,107,157,0.12)' : 'transparent',
           }}>{i+1}</div>
@@ -1044,7 +1046,7 @@ function TextDiff({ mobile }) {
             <div style={{display:'flex', borderRadius:6, overflow:'hidden', border:'1px solid rgba(255,255,255,0.1)', background:'rgba(255,255,255,0.04)'}}>
               <LineNumCol text={val} changedSet={cset}/>
               <textarea style={{...ta, border:'none', borderRadius:0, background:'transparent', flex:1, resize:'vertical'}}
-                value={val} placeholder="Text hier einfügen…"
+                wrap="off" value={val} placeholder="Text hier einfügen…"
                 onChange={e=>{ setter(e.target.value); setDiff(null); }}/>
             </div>
           </div>