chore: remove unused senderName field from reaction type

Baileys reaction events don't include push names, so this field
was dead interface pollution. (Cursor review)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/web/inbound/types.ts

@@ -57,8 +57,6 @@ export type WebInboundReaction = {
   senderJid?: string;
   /** E.164 of the person who reacted. */
   senderE164?: string;
-  /** Push name of the person who reacted. */
-  senderName?: string;
   /** Whether the reacted message was sent by us. */
   reactedToFromMe?: boolean;
   timestamp?: number;