fix(pitch-deck): remove Berechnen button + cell editing from Finanzplan

Finanzplan is now read-only for investors:
- Removed "Berechnen" / "Compute" button
- Removed cell double-click editing
- Removed blue edit indicator dots
- All sums computed live in frontend (no manual recompute needed)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pitch-deck/components/slides/FinanzplanSlide.tsx

@@ -99,7 +99,6 @@ export default function FinanzplanSlide({ lang, investorId, preferredScenarioId,
   const [activeSheet, setActiveSheet] = useState<string>('guv')
   const [rows, setRows] = useState<SheetRow[]>([])
   const [loading, setLoading] = useState(false)
-  const [computing, setComputing] = useState(false)
   const [yearOffset, setYearOffset] = useState(0) // 0=2026, 1=2027, ...
   const de = lang === 'de'
 
@@ -197,31 +196,6 @@ export default function FinanzplanSlide({ lang, investorId, preferredScenarioId,
 
   useEffect(() => { loadSheet(activeSheet) }, [activeSheet, loadSheet])
 
-  // Compute
-  const handleCompute = async () => {
-    setComputing(true)
-    try {
-      await fetch('/api/finanzplan/compute', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ scenarioId: selectedScenarioId || undefined }) })
-      await loadSheet(activeSheet)
-    } catch { /* ignore */ }
-    setComputing(false)
-  }
-
-  // Cell edit
-  const handleCellEdit = async (rowId: number, monthKey: string, newValue: string) => {
-    const numVal = parseFloat(newValue.replace(/[^\d.-]/g, ''))
-    if (isNaN(numVal)) return
-
-    try {
-      await fetch(`/api/finanzplan/${activeSheet}`, {
-        method: 'PUT',
-        headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ rowId, updates: { [monthKey]: numVal } }),
-      })
-      await loadSheet(activeSheet)
-    } catch { /* ignore */ }
-  }
-
   const currentYear = 2026 + yearOffset
   const monthStart = yearOffset * 12 + 1
   const monthEnd = monthStart + 11
@@ -270,15 +244,6 @@ export default function FinanzplanSlide({ lang, investorId, preferredScenarioId,
             {tab.label}
           </button>
         ))}
-        <div className="flex-1" />
-        <button
-          onClick={handleCompute}
-          disabled={computing}
-          className="flex items-center gap-1 px-3 py-1.5 text-[10px] bg-emerald-500/20 text-emerald-300 rounded-lg hover:bg-emerald-500/30 transition-colors disabled:opacity-50"
-        >
-          <RefreshCw className={`w-3 h-3 ${computing ? 'animate-spin' : ''}`} />
-          {de ? 'Berechnen' : 'Compute'}
-        </button>
       </div>
 
       {/* === KPIs Tab === */}
@@ -656,7 +621,7 @@ export default function FinanzplanSlide({ lang, investorId, preferredScenarioId,
                 const label = getLabel(row)
                 const isSumRow = row.is_sum_row || label.includes('GESAMT') || label.includes('Summe') || label.includes('ÜBERSCHUSS') || label.includes('LIQUIDITÄT') || label.includes('UEBERSCHUSS') || label.includes('LIQUIDITAET')
                 const isTotalRow = label.includes('GESAMT') || label.includes('Bestandskunden gesamt') || label.includes('GESAMTUMSATZ') || label.includes('SUMME')
-                const isEditable = row.is_editable
+                const isEditable = false // read-only for investors
                 // Balance rows show Dec value, flow rows show annual sum
                 const isBalanceRow = label.includes('Kontostand') || label === 'LIQUIDITÄT' || label === 'LIQUIDITAET'
                 const isUnitPrice = (row as Record<string, unknown>).section === 'unit_cost' || (row as Record<string, unknown>).section === 'einkauf' || label.includes('Einkaufspreis')