fix(presenter): fix resume after chat interruption + sync stateRef

stateRef was still 'resuming' when advanceRef.current() ran,
causing it to bail out. Now sync stateRef immediately before advance.

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

pitch-deck/lib/hooks/usePresenterMode.ts

@@ -313,6 +313,7 @@ export function usePresenterMode({
     clearTimer()
     cancelSpeech()
     setState('presenting')
+    stateRef.current = 'presenting'
 
     const slideIdx = slideIndexRef.current
     const script = getScriptForIndex(slideIdx)
@@ -345,8 +346,10 @@ export function usePresenterMode({
 
   const resume = useCallback(() => {
     setState('resuming')
+    stateRef.current = 'resuming'
     timerRef.current = setTimeout(() => {
       setState('presenting')
+      stateRef.current = 'presenting' // Sync ref immediately before calling advance
       advanceRef.current()
     }, 2000)
   }, [])