fix: always show tab scroll buttons in PropertyDetailView — Aktivitätslog sichtbar

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

src/components/supply/PropertyDetailView.tsx

@@ -311,7 +311,7 @@ function SignalsPanel({ signals }: { signals: FutureSignal[] }) {
 
 // ── Main component ────────────────────────────────────────────────────────────
 
-const TABS = ['Übersicht', 'Verhandlung & Markt', 'Hard Facts', 'Soft Factors', 'Matchability', 'Datenqualität', 'Quelle', 'Signale', 'Aktivitätslog'] as const
+const TABS = ['Übersicht', 'Verhandlung', 'Hard Facts', 'Soft Factors', 'Matchability', 'Datenqualität', 'Quelle', 'Signale', 'Aktivitätslog'] as const
 
 export function PropertyDetailView({ propertyId, onClose }: PropertyDetailViewProps) {
   const [tab, setTab] = useState(0)
@@ -393,11 +393,13 @@ export function PropertyDetailView({ propertyId, onClose }: PropertyDetailViewPr
         value={tab}
         onChange={(_, v) => setTab(v)}
         variant="scrollable"
-        scrollButtons="auto"
+        scrollButtons
+        allowScrollButtonsMobile
         sx={{
           borderBottom: '1px solid #e2e8f0',
           flexShrink: 0,
           '& .MuiTab-root': { textTransform: 'none', fontSize: '0.8rem', minWidth: 'auto', px: 1.5 },
+          '& .MuiTabScrollButton-root': { width: 28 },
         }}
       >
         {TABS.map(label => (