FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

node_modules/viem/chains/definitions/zksyncSepoliaTestnet.ts

@@ -0,0 +1,34 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+import { chainConfig } from '../../zksync/chainConfig.js'
+
+export const zksyncSepoliaTestnet = /*#__PURE__*/ defineChain({
+  ...chainConfig,
+  blockTime: 200,
+  id: 300,
+  name: 'ZKsync Sepolia Testnet',
+  network: 'zksync-sepolia-testnet',
+  nativeCurrency: { name: 'Ether', symbol: 'ETH', decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ['https://sepolia.era.zksync.dev'],
+      webSocket: ['wss://sepolia.era.zksync.dev/ws'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'ZKsync Explorer',
+      url: 'https://sepolia.explorer.zksync.io/',
+      blockExplorerApi: 'https://block-explorer-api.sepolia.zksync.dev/api',
+    },
+  },
+  contracts: {
+    multicall3: {
+      address: '0xF9cda624FBC7e059355ce98a31693d299FACd963',
+    },
+    erc6492Verifier: {
+      address: '0xfB688330379976DA81eB64Fe4BF50d7401763B9C',
+      blockCreated: 3855712,
+    },
+  },
+  testnet: true,
+})