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/@tanstack/solid-query/src/useIsMutating.ts

@@ -0,0 +1,25 @@
+import { createMemo, createSignal, onCleanup } from 'solid-js'
+import { useQueryClient } from './QueryClientProvider'
+import type { MutationFilters } from '@tanstack/query-core'
+import type { QueryClient } from './QueryClient'
+import type { Accessor } from 'solid-js'
+
+export function useIsMutating(
+  filters?: Accessor<MutationFilters>,
+  queryClient?: Accessor<QueryClient>,
+): Accessor<number> {
+  const client = createMemo(() => useQueryClient(queryClient?.()))
+  const mutationCache = createMemo(() => client().getMutationCache())
+
+  const [mutations, setMutations] = createSignal(
+    client().isMutating(filters?.()),
+  )
+
+  const unsubscribe = mutationCache().subscribe((_result) => {
+    setMutations(client().isMutating(filters?.()))
+  })
+
+  onCleanup(unsubscribe)
+
+  return mutations
+}