Phase 9: Timeline playback controls & polish

[elfensky]

Deferred enhancements from Phase 4 (War Outcome & Interactive Timeline):

• Auto-play / play-pause controls with usePlayback hook
• Speed selector (1x / 2x / 5x / 10x), day counter, jump-to-next-event
• CSS transitions on map sectors for smooth state changes during scrubbing
• Event visualization effects (green/red flash for success/fail)
• Use h1_event_snapshot data for live dashboard event progress (not historical replay)
• Add points, points_taken, points_max, status to h1_live_snapshot for future richer replay

Related: #25 (map history replay)