fix(pitch-deck): TTS letter spelling (CE/SAST/DAST) + Finanzplan slide loads version scenario

TTS:
- CE → "C. E." for letter-by-letter pronunciation
- SAST → "S. A. S. T.", DAST → "D. A. S. T."

Finanzplan Slide 28:
- Data grid now loads Wandeldarlehen fp_scenario when active FM scenario
  contains "wandeldarlehen" (scenarioId=c0000000-...-000000000200)
- Base Case version continues to load default fp_scenario

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

pitch-deck/components/slides/FinanzplanSlide.tsx

@@ -77,6 +77,11 @@ export default function FinanzplanSlide({ lang, investorId, preferredScenarioId
     [fm.activeResults],
   )
 
+  // Determine fp_scenario_id from the active FM scenario name
+  const fpScenarioParam = fm.activeScenario?.name?.toLowerCase().includes('wandeldarlehen')
+    ? '?scenarioId=c0000000-0000-0000-0000-000000000200'
+    : ''
+
   // Load sheet list
   useEffect(() => {
     fetch('/api/finanzplan')
@@ -94,12 +99,12 @@ export default function FinanzplanSlide({ lang, investorId, preferredScenarioId
     }
     setLoading(true)
     try {
-      const r = await fetch(`/api/finanzplan/${name}`)
+      const r = await fetch(`/api/finanzplan/${name}${fpScenarioParam}`)
       const data = await r.json()
       setRows(data.rows || [])
     } catch { /* ignore */ }
     setLoading(false)
-  }, [])
+  }, [fpScenarioParam])
 
   useEffect(() => { loadSheet(activeSheet) }, [activeSheet, loadSheet])