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/megaeth.ts

@@ -0,0 +1,59 @@
+import { chainConfig } from '../../op-stack/chainConfig.js'
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+const sourceId = 1 // mainnet
+
+export const megaeth = /*#__PURE__*/ defineChain({
+  ...chainConfig,
+  id: 4326,
+  blockTime: 1_000,
+  name: 'MegaETH',
+  nativeCurrency: {
+    name: 'Ether',
+    symbol: 'ETH',
+    decimals: 18,
+  },
+  rpcUrls: {
+    default: {
+      http: ['https://mainnet.megaeth.com/rpc'],
+      webSocket: ['wss://mainnet.megaeth.com/ws'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Etherscan',
+      url: 'https://mega.etherscan.io',
+      apiUrl: 'https://api.etherscan.io/v2/api',
+    },
+    blockscout: {
+      name: 'Blockscout',
+      url: 'https://megaeth.blockscout.com',
+      apiUrl: 'https://megaeth.blockscout.com/api',
+    },
+  },
+  contracts: {
+    ...chainConfig.contracts,
+    disputeGameFactory: {
+      [sourceId]: {
+        address: '0x8546840adF796875cD9AAcc5B3B048f6B2c9D563',
+      },
+    },
+    multicall3: {
+      address: '0xcA11bde05977b3631167028862bE2a173976CA11',
+      blockCreated: 0,
+    },
+    portal: {
+      [sourceId]: {
+        address: '0x7f82f57F0Dd546519324392e408b01fcC7D709e8',
+        blockCreated: 21644285,
+      },
+    },
+    l1StandardBridge: {
+      [sourceId]: {
+        address: '0x0CA3A2FBC3D770b578223FBB6b062fa875a2eE75',
+        blockCreated: 21644285,
+      },
+    },
+  },
+  sourceId,
+})