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Add comprehensive audio synchronization configuration and testing: - Create AudioSyncConfig types for audio events, background music, and scene audio configurations - Define audio timing for all 9 scenes with frame-accurate sync points - Add utilities for absolute frame calculation, volume interpolation, and sync verification with tolerance support - Include 94 tests covering timing calculations, overlap detection, volume consistency, and frame-accurate sync point verification The new audioSync.ts provides a centralized source of truth for all audio-visual synchronization, enabling automated verification of audio timing accuracy across the Portal Presentation composition. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>