fix(pitch): showcase sidebar shows only filtered slides + AI presenter via FAB

NavigationFAB and SlideOverview now accept slideNames prop and render only the
active slide list (filtered for showcase mode). Adds AI presenter start button
to the FAB footer so it's accessible even when intro-presenter slide is hidden.

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

pitch-deck/components/SlideOverview.tsx

@@ -9,10 +9,12 @@ interface SlideOverviewProps {
   onGoToSlide: (index: number) => void
   onClose: () => void
   lang: Language
+  slideNames?: string[]
 }
 
-export default function SlideOverview({ currentIndex, onGoToSlide, onClose, lang }: SlideOverviewProps) {
+export default function SlideOverview({ currentIndex, onGoToSlide, onClose, lang, slideNames: slideNamesProp }: SlideOverviewProps) {
   const i = t(lang)
+  const activeSlideNames = slideNamesProp ?? i.slideNames
 
   return (
     <motion.div
@@ -28,7 +30,7 @@ export default function SlideOverview({ currentIndex, onGoToSlide, onClose, lang
         className="grid grid-cols-3 md:grid-cols-4 lg:grid-cols-5 gap-3 max-w-5xl w-full"
         onClick={(e) => e.stopPropagation()}
       >
-        {i.slideNames.map((name, idx) => (
+        {activeSlideNames.map((name, idx) => (
           <motion.button
             key={idx}
             initial={{ opacity: 0, y: 20 }}