feat: Replace RondevuConnection with RondevuPeer state machine

- Created type-safe EventEmitter with generics
- Implemented state pattern for peer connection lifecycle
- Added comprehensive timeout handling for all connection phases
- Removed client-provided offer IDs (server generates hash-based IDs)
- Replaced RondevuConnection with RondevuPeer throughout
- Added states: idle, creating-offer, waiting-for-answer, answering, exchanging-ice, connected, failed, closed
- Configurable timeouts: ICE gathering, waiting for answer, creating answer, ICE connection
- Better error handling with 'failed' event and error details

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/offers.ts

@@ -5,7 +5,6 @@ import { RondevuAuth } from './auth.js';
 declare const Buffer: any;
 
 export interface CreateOfferRequest {
-  id?: string;
   sdp: string;
   topics: string[];
   ttl?: number;
@@ -24,18 +23,8 @@ export interface Offer {
   answeredAt?: number;
 }
 
-/**
- * RTCIceCandidateInit interface for environments without native WebRTC types
- */
-export interface RTCIceCandidateInit {
-  candidate?: string;
-  sdpMid?: string | null;
-  sdpMLineIndex?: number | null;
-  usernameFragment?: string | null;
-}
-
 export interface IceCandidate {
-  candidate: RTCIceCandidateInit; // Full candidate object
+  candidate: any; // Full candidate object as plain JSON - don't enforce structure
   peerId: string;
   role: 'offerer' | 'answerer';
   createdAt: number;
@@ -290,7 +279,7 @@ export class RondevuOffers {
    */
   async addIceCandidates(
     offerId: string,
-    candidates: RTCIceCandidateInit[]
+    candidates: any[]
   ): Promise<void> {
     const response = await this.fetchFn(`${this.baseUrl}/offers/${encodeURIComponent(offerId)}/ice-candidates`, {
       method: 'POST',