fix(pitch-deck): add loading fallback for Unternehmensentwicklung tile

Shows "Lade Finanzplan..." when annualKPIs is empty (data not yet loaded)
instead of rendering nothing.

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

pitch-deck/components/slides/ExecutiveSummarySlide.tsx

@@ -537,7 +537,9 @@ export default function ExecutiveSummarySlide({ lang, data, investorId }: Execut
               <span>{de ? 'Jahr' : 'Year'}</span><span className="text-right">MA</span><span className="text-right">{de ? 'Kunden' : 'Customers'}</span><span className="text-right">ARR</span>
             </div>
             <div className="space-y-1">
-              {annualKPIs.map((k, idx) => {
+              {annualKPIs.length === 0 ? (
+                <p className="text-xs text-white/30 text-center py-2">{de ? 'Lade Finanzplan...' : 'Loading financial plan...'}</p>
+              ) : annualKPIs.map((k, idx) => {
                 const arrLabel = k.arr >= 1_000_000
                   ? (de ? `~${(k.arr / 1_000_000).toFixed(1).replace('.', ',')} Mio. EUR` : `~EUR ${(k.arr / 1_000_000).toFixed(1)}M`)
                   : (de ? `~${Math.round(k.arr / 1000)}k EUR` : `~EUR ${Math.round(k.arr / 1000)}k`)