Function useReactionSync

useReactionSync(options: UseReactionSyncOptions): UseReactionSyncResult
Core hook for sending and receiving reaction effects in a room.

Routes reaction events over the semantic relay (low-latency QUIC datagrams). Listens for incoming reactions from other participants and fires the active-effect lifecycle. Handles permission enforcement and cooldown throttling locally; delivery dedup + self-message filtering is provided by useRelaySubProtocol so this hook stays small.
Parameters
- options: UseReactionSyncOptions
Returns UseReactionSyncResult
Example
```
const { triggerReaction, activeEffect, canTrigger, isCoolingDown } = useReactionSync({
  localUserId: user.email,
  isOwner: true,
  permission: 'owner-only',
});

// Trigger a reaction
triggerReaction('heart');

// Render the active effect
<ReactionsOverlay activeEffect={activeEffect} onEffectComplete={clearEffect} />
```
- Defined in hooks/useReactionSync.ts:41