fix(showcase): block financial data from AI Q&A, fix FAB overflow, fix presenter slide mapping

AI Q&A: fetch is_showcase from DB; showcase sessions receive no financial/funding
context and have an explicit LLM guard refusing to discuss investment details.
FAQ context and financial slide IDs stripped from system prompt.

FAB: flex layout so Fullscreen button is always visible regardless of panel height.

Presenter: pass activeSlideOrder to usePresenterMode so buildSlideAudioPlan maps
slideIdx → slideId from the filtered list, not the full SLIDE_ORDER. Progress
calculation also filters to active scripts only.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pitch-deck/components/PitchDeck.tsx

@@ -105,6 +105,7 @@ export default function PitchDeck({ lang, onToggleLanguage, investor, onLogout,
     currentSlide: nav.currentIndex,
     totalSlides: nav.totalSlides,
     language: lang,
+    slideOrder: activeSlideOrder,
   })
 
   // Audit tracking