feat: Phase 5+6 — Finanzplan Bridge + Financials-Slide Sync

- Adapter: fp_* Tabellen → FMResult Interface (60 Monate)
- Compute-Endpoint: source=finanzplan delegiert an Finanzplan-Engine
- useFinancialModel Hook: computeFromFinanzplan() + finanzplanResults
- FinancialsSlide: Toggle "Szenario-Modell" vs "Finanzplan (Excel)"
- Gruendungsdatum fix: EK+FK auf Aug (m8), Raumkosten ab Aug
- Startup-Preisstaffel: <10 MA ab 3.600 EUR/Jahr, 14-Tage-Test

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

pitch-deck/components/slides/FinancialsSlide.tsx

@@ -28,7 +28,8 @@ export default function FinancialsSlide({ lang }: FinancialsSlideProps) {
   const [activeTab, setActiveTab] = useState<FinTab>('overview')
   const de = lang === 'de'
 
-  const activeResults = fm.activeResults
+  const [useFinanzplan, setUseFinanzplan] = useState(false)
+  const activeResults = useFinanzplan ? fm.finanzplanResults : fm.activeResults
   const summary = activeResults?.summary
   const lastResult = activeResults?.results[activeResults.results.length - 1]
 
@@ -65,6 +66,20 @@ export default function FinancialsSlide({ lang }: FinancialsSlideProps) {
           <GradientText>{i.financials.title}</GradientText>
         </h2>
         <p className="text-sm text-white/50 max-w-2xl mx-auto">{i.financials.subtitle}</p>
+        <div className="flex items-center justify-center gap-2 mt-2">
+          <button
+            onClick={() => { setUseFinanzplan(false) }}
+            className={`px-3 py-1 text-[10px] rounded-lg transition-colors ${!useFinanzplan ? 'bg-indigo-500/20 text-indigo-300 border border-indigo-500/30' : 'text-white/40 hover:text-white/60'}`}
+          >
+            {de ? 'Szenario-Modell' : 'Scenario Model'}
+          </button>
+          <button
+            onClick={async () => { setUseFinanzplan(true); await fm.computeFromFinanzplan() }}
+            className={`px-3 py-1 text-[10px] rounded-lg transition-colors ${useFinanzplan ? 'bg-emerald-500/20 text-emerald-300 border border-emerald-500/30' : 'text-white/40 hover:text-white/60'}`}
+          >
+            {fm.computing ? '...' : (de ? 'Finanzplan (Excel)' : 'Financial Plan (Excel)')}
+          </button>
+        </div>
       </FadeInView>
 
       {/* Hero KPI Cards */}