feat(pitch): showcase mode — per-investor toggle hides financial/investor slides for customer demos

Adds is_showcase boolean to pitch_investors; when set, filters out financials,
the ask, cap table, assumptions, finanzplan, risks, and intro-presenter slides.
Slide navigation is fully dynamic — progress bar and counts update accordingly.

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

pitch-deck/lib/hooks/useSlideNavigation.ts

@@ -1,21 +1,23 @@
 'use client'
 
 import { useState, useCallback } from 'react'
+import { SlideId } from '../types'
 import { SLIDE_ORDER, TOTAL_SLIDES } from '../slide-order'
 
 // Re-export for backwards compatibility
 export { SLIDE_ORDER, TOTAL_SLIDES }
 
-export function useSlideNavigation() {
+export function useSlideNavigation(slideOrder: SlideId[] = SLIDE_ORDER) {
+  const total = slideOrder.length
   const [currentIndex, setCurrentIndex] = useState(0)
   const [direction, setDirection] = useState(0)
   const [visitedSlides, setVisitedSlides] = useState<Set<number>>(new Set([0]))
   const [showOverview, setShowOverview] = useState(false)
 
-  const currentSlide = SLIDE_ORDER[currentIndex]
+  const currentSlide = slideOrder[currentIndex]
 
   const goToSlide = useCallback((index: number) => {
-    if (index < 0 || index >= TOTAL_SLIDES) return
+    if (index < 0 || index >= total) return
     setDirection(index > currentIndex ? 1 : -1)
     setCurrentIndex(index)
     setVisitedSlides(prev => new Set([...prev, index]))
@@ -23,10 +25,10 @@ export function useSlideNavigation() {
   }, [currentIndex])
 
   const nextSlide = useCallback(() => {
-    if (currentIndex < TOTAL_SLIDES - 1) {
+    if (currentIndex < total - 1) {
       goToSlide(currentIndex + 1)
     }
-  }, [currentIndex, goToSlide])
+  }, [currentIndex, goToSlide, total])
 
   const prevSlide = useCallback(() => {
     if (currentIndex > 0) {
@@ -35,7 +37,7 @@ export function useSlideNavigation() {
   }, [currentIndex, goToSlide])
 
   const goToFirst = useCallback(() => goToSlide(0), [goToSlide])
-  const goToLast = useCallback(() => goToSlide(TOTAL_SLIDES - 1), [goToSlide])
+  const goToLast = useCallback(() => goToSlide(total - 1), [goToSlide, total])
 
   const toggleOverview = useCallback(() => {
     setShowOverview(prev => !prev)
@@ -47,8 +49,8 @@ export function useSlideNavigation() {
     direction,
     visitedSlides,
     showOverview,
-    totalSlides: TOTAL_SLIDES,
-    slideOrder: SLIDE_ORDER,
+    totalSlides: total,
+    slideOrder,
     goToSlide,
     nextSlide,
     prevSlide,
@@ -57,6 +59,6 @@ export function useSlideNavigation() {
     toggleOverview,
     setShowOverview,
     isFirst: currentIndex === 0,
-    isLast: currentIndex === TOTAL_SLIDES - 1,
+    isLast: currentIndex === total - 1,
   }
 }