fix(pitch-deck): presenter fixes — prev button, TTS pronunciation, text accuracy

- Fix: Zurück-Button — onPrev was not passed to PresenterOverlay
- TTS: BreakPilot, Executive Summary etc. pronounced in English
- "Ihre Kunden" → "Unsere Kunden"
- "kein kleine" → "kein kleines und mittleres Unternehmen vorhalten kann"
- Removed all false "lösen/befreien" claims

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

pitch-deck/app/api/presenter/tts/route.ts

@@ -29,7 +29,21 @@ export async function POST(request: NextRequest) {
       return await synthesizeViaOvh(text, OVH_EN)
     }
 
-    return await synthesizeViaComplianceService(text, language)
+    // Fix pronunciation of English words in German TTS
+    let ttsText = text
+    if (language === 'de') {
+      ttsText = ttsText
+        .replace(/BreakPilot/g, 'Bräikpailot')
+        .replace(/Breakpilot/g, 'Bräikpailot')
+        .replace(/Executive Summary/g, 'Exekjutiv Sammäri')
+        .replace(/Onepager/g, 'Wann-Päidscher')
+        .replace(/Land & Expand/g, 'Länd änd Expänd')
+        .replace(/Compliance Optimizer/g, 'Compliance Optimeiser')
+        .replace(/Deep Dive/g, 'Diep Deiv')
+        .replace(/Use Case/g, 'Juhs Käis')
+    }
+
+    return await synthesizeViaComplianceService(ttsText, language)
   } catch (error) {
     console.error('TTS proxy error:', error)
     return NextResponse.json({ error: 'TTS service not reachable' }, { status: 503 })