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/seiTestnet.ts

@@ -0,0 +1,27 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const seiTestnet = /*#__PURE__*/ defineChain({
+  id: 1328,
+  name: 'Sei Testnet',
+  nativeCurrency: { name: 'Sei', symbol: 'SEI', decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ['https://evm-rpc-testnet.sei-apis.com'],
+      webSocket: ['wss://evm-ws-testnet.sei-apis.com'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Seiscan',
+      url: 'https://testnet.seiscan.io',
+      apiUrl: 'https://api.etherscan.io/v2/api',
+    },
+  },
+  contracts: {
+    multicall3: {
+      address: '0xcA11bde05977b3631167028862bE2a173976CA11',
+      blockCreated: 98697651,
+    },
+  },
+  testnet: true,
+})