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/NavigationFAB.tsx

@@ -76,12 +76,12 @@ export default function NavigationFAB({
             animate={{ opacity: 1, scale: 1, y: 0 }}
             exit={{ opacity: 0, scale: 0.9, y: 20 }}
             transition={{ duration: 0.2 }}
-            className="w-[300px] max-h-[80vh] rounded-2xl overflow-hidden
+            className="w-[300px] max-h-[80vh] flex flex-col rounded-2xl overflow-hidden
               bg-black/80 backdrop-blur-xl border border-white/10
               shadow-2xl shadow-black/50"
           >
             {/* Header */}
-            <div className="flex items-center justify-between px-4 py-3 border-b border-white/10">
+            <div className="shrink-0 flex items-center justify-between px-4 py-3 border-b border-white/10">
               <span className="text-sm font-semibold text-white">{i.nav.slides}</span>
               <button
                 onClick={() => setIsOpen(false)}
@@ -93,7 +93,7 @@ export default function NavigationFAB({
             </div>
 
             {/* Slide List */}
-            <div className="overflow-y-auto max-h-[55vh] py-2">
+            <div className="flex-1 overflow-y-auto py-2">
               {activeSlideNames.map((name, idx) => {
                 const isActive = idx === currentIndex
                 const isVisited = visitedSlides.has(idx)
@@ -134,7 +134,7 @@ export default function NavigationFAB({
             </div>
 
             {/* Footer */}
-            <div className="border-t border-white/10 px-4 py-3 space-y-2">
+            <div className="shrink-0 border-t border-white/10 px-4 py-3 space-y-2">
               {/* Language Toggle */}
               <button
                 onClick={onToggleLanguage}