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/@trpc/client/skills/links/SKILL.md

@@ -0,0 +1,301 @@
+---
+name: links
+description: >
+  Configure the tRPC client link chain: httpLink, httpBatchLink,
+  httpBatchStreamLink, splitLink, loggerLink, wsLink, createWSClient,
+  httpSubscriptionLink, unstable_localLink, retryLink. Choose the right
+  terminating link. Route subscriptions via splitLink. Build custom links
+  for SOA routing. Link options: url, headers, transformer, maxURLLength,
+  maxItems, connectionParams, EventSource ponyfill.
+type: core
+library: trpc
+library_version: '11.15.1'
+requires:
+  - client-setup
+sources:
+  - www/docs/client/links/overview.md
+  - www/docs/client/links/httpLink.md
+  - www/docs/client/links/httpBatchLink.md
+  - www/docs/client/links/httpBatchStreamLink.md
+  - www/docs/client/links/splitLink.mdx
+  - www/docs/client/links/wsLink.md
+  - www/docs/client/links/httpSubscriptionLink.md
+  - www/docs/client/links/localLink.mdx
+  - www/docs/client/links/loggerLink.md
+  - packages/client/src/links/
+---
+
+# tRPC -- Links
+
+## Setup
+
+```ts
+import { createTRPCClient, httpBatchLink, loggerLink } from '@trpc/client';
+import type { AppRouter } from './server';
+
+const client = createTRPCClient<AppRouter>({
+  links: [
+    loggerLink(),
+    httpBatchLink({
+      url: 'http://localhost:3000/trpc',
+    }),
+  ],
+});
+```
+
+The `links` array is a chain: non-terminating links (loggerLink, splitLink, retryLink) forward operations; the chain must end with a terminating link (httpBatchLink, httpLink, httpBatchStreamLink, wsLink, httpSubscriptionLink, unstable_localLink).
+
+## Core Patterns
+
+### httpBatchLink -- Batch Multiple Calls into One Request
+
+```ts
+import { createTRPCClient, httpBatchLink } from '@trpc/client';
+import type { AppRouter } from './server';
+
+const client = createTRPCClient<AppRouter>({
+  links: [
+    httpBatchLink({
+      url: 'http://localhost:3000/trpc',
+      maxURLLength: 2083,
+      maxItems: 10,
+    }),
+  ],
+});
+
+const [post1, post2, post3] = await Promise.all([
+  client.post.byId.query(1),
+  client.post.byId.query(2),
+  client.post.byId.query(3),
+]);
+```
+
+Concurrent calls are batched into a single HTTP request. Set `maxURLLength` to prevent 414 errors from long URLs.
+
+### splitLink -- Route Subscriptions to SSE
+
+```ts
+import {
+  createTRPCClient,
+  httpBatchLink,
+  httpSubscriptionLink,
+  splitLink,
+} from '@trpc/client';
+import type { AppRouter } from './server';
+
+const client = createTRPCClient<AppRouter>({
+  links: [
+    splitLink({
+      condition: (op) => op.type === 'subscription',
+      true: httpSubscriptionLink({
+        url: 'http://localhost:3000/trpc',
+      }),
+      false: httpBatchLink({
+        url: 'http://localhost:3000/trpc',
+      }),
+    }),
+  ],
+});
+```
+
+### splitLink -- Disable Batching Per-Request via Context
+
+```ts
+import {
+  createTRPCClient,
+  httpBatchLink,
+  httpLink,
+  splitLink,
+} from '@trpc/client';
+import type { AppRouter } from './server';
+
+const client = createTRPCClient<AppRouter>({
+  links: [
+    splitLink({
+      condition: (op) => Boolean(op.context.skipBatch),
+      true: httpLink({ url: 'http://localhost:3000/trpc' }),
+      false: httpBatchLink({ url: 'http://localhost:3000/trpc' }),
+    }),
+  ],
+});
+
+const result = await client.post.byId.query(1, {
+  context: { skipBatch: true },
+});
+```
+
+### httpBatchStreamLink -- Stream Responses as They Arrive
+
+```ts
+import { createTRPCClient, httpBatchStreamLink } from '@trpc/client';
+import type { AppRouter } from './server';
+
+const client = createTRPCClient<AppRouter>({
+  links: [
+    httpBatchStreamLink({
+      url: 'http://localhost:3000/trpc',
+    }),
+  ],
+});
+
+const iterable = await client.examples.iterable.query();
+for await (const value of iterable) {
+  console.log(value);
+}
+```
+
+### wsLink -- WebSocket Terminating Link
+
+```ts
+import { createTRPCClient, createWSClient, wsLink } from '@trpc/client';
+import type { AppRouter } from './server';
+
+const wsClient = createWSClient({
+  url: 'ws://localhost:3000',
+});
+
+const client = createTRPCClient<AppRouter>({
+  links: [wsLink<AppRouter>({ client: wsClient })],
+});
+```
+
+### Custom Link
+
+```ts
+import { TRPCLink } from '@trpc/client';
+import { observable } from '@trpc/server/observable';
+import type { AppRouter } from './server';
+
+export const timingLink: TRPCLink<AppRouter> = () => {
+  return ({ next, op }) => {
+    return observable((observer) => {
+      const start = Date.now();
+      const unsubscribe = next(op).subscribe({
+        next(value) {
+          observer.next(value);
+        },
+        error(err) {
+          console.error(`${op.path} failed in ${Date.now() - start}ms`);
+          observer.error(err);
+        },
+        complete() {
+          console.log(`${op.path} completed in ${Date.now() - start}ms`);
+          observer.complete();
+        },
+      });
+      return unsubscribe;
+    });
+  };
+};
+```
+
+## Common Mistakes
+
+### [CRITICAL] No terminating link in the chain
+
+Wrong:
+
+```ts
+const client = createTRPCClient<AppRouter>({
+  links: [loggerLink()],
+});
+```
+
+Correct:
+
+```ts
+const client = createTRPCClient<AppRouter>({
+  links: [loggerLink(), httpBatchLink({ url: 'http://localhost:3000/trpc' })],
+});
+```
+
+The link chain must end with a terminating link. Without one, tRPC throws "No more links to execute - did you forget to add an ending link?"
+
+Source: packages/client/src/links/internals/createChain.ts
+
+### [CRITICAL] Sending subscriptions through httpLink or httpBatchLink
+
+Wrong:
+
+```ts
+const client = createTRPCClient<AppRouter>({
+  links: [httpBatchLink({ url: 'http://localhost:3000/trpc' })],
+});
+await client.onMessage.subscribe({});
+```
+
+Correct:
+
+```ts
+const client = createTRPCClient<AppRouter>({
+  links: [
+    splitLink({
+      condition: (op) => op.type === 'subscription',
+      true: httpSubscriptionLink({ url: 'http://localhost:3000/trpc' }),
+      false: httpBatchLink({ url: 'http://localhost:3000/trpc' }),
+    }),
+  ],
+});
+```
+
+httpLink and httpBatchLink throw on subscription operations. Subscriptions must use httpSubscriptionLink or wsLink, routed via splitLink.
+
+Source: packages/client/src/links/httpLink.ts
+
+### [HIGH] httpBatchLink and httpBatchStreamLink headers callback receives { opList }
+
+`httpBatchLink` and `httpBatchStreamLink` headers callbacks receive `{ opList }` (a `NonEmptyArray<Operation>`), not `{ op }` like `httpLink`. Access per-operation context via `opList[0]?.context`:
+
+```ts
+httpBatchLink({
+  url: 'http://localhost:3000/trpc',
+  headers({ opList }) {
+    return { authorization: opList[0]?.context.token };
+  },
+});
+```
+
+`httpBatchLink` headers callback receives `{ opList }` (an array of operations)
+
+Source: packages/client/src/links/httpBatchLink.ts
+
+### [MEDIUM] Default batch limits are Infinity
+
+Wrong:
+
+```ts
+httpBatchLink({ url: 'http://localhost:3000/trpc' });
+```
+
+Correct:
+
+```ts
+httpBatchLink({
+  url: 'http://localhost:3000/trpc',
+  maxURLLength: 2083,
+  // should be the same or lower than the server's maxBatchSize
+  maxItems: 10,
+});
+```
+
+Both `maxURLLength` and `maxItems` default to `Infinity`, which can cause 413/414 HTTP errors on servers or CDNs with URL length limits. When the server sets `maxBatchSize`, set `maxItems` to the same or lower value so the client auto-splits batches instead of triggering a `400 Bad Request`.
+
+Source: packages/client/src/links/httpBatchLink.ts
+
+### [HIGH] httpBatchStreamLink data loss on stream completion
+
+There is a known race condition where buffered chunks can be lost on normal stream completion. Long streaming responses (e.g., LLM output) may be truncated. If you experience truncated data, switch to `httpBatchLink` for those operations.
+
+Source: https://github.com/trpc/trpc/issues/7209
+
+## References
+
+- [Link options reference](references/link-options.md)
+
+## See Also
+
+- `client-setup` -- create the tRPC client and configure links
+- `superjson` -- add transformer to links for Date/Map/Set support
+- `subscriptions` -- set up SSE or WebSocket real-time streams
+- `non-json-content-types` -- route FormData/binary through splitLink + httpLink
+- `service-oriented-architecture` -- build custom routing links for multi-service backends

node_modules/@trpc/client/skills/links/references/link-options.md

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+# Link Options Reference
+
+## httpLink
+
+Terminating link that sends one tRPC operation per HTTP request.
+
+```ts
+import { httpLink } from '@trpc/client';
+
+httpLink({
+  url: 'http://localhost:3000/trpc',
+  fetch: customFetch,
+  transformer: superjson,
+  headers: { Authorization: 'Bearer token' },
+  methodOverride: 'POST',
+});
+```
+
+| Option           | Type                                                                              | Default        | Description                                   |
+| ---------------- | --------------------------------------------------------------------------------- | -------------- | --------------------------------------------- |
+| `url`            | `string \| URL`                                                                   | required       | Server endpoint URL                           |
+| `fetch`          | `typeof fetch`                                                                    | global `fetch` | Fetch ponyfill                                |
+| `transformer`    | `DataTransformerOptions`                                                          | none           | Data transformer (e.g. superjson)             |
+| `headers`        | `HTTPHeaders \| (opts: { op: Operation }) => HTTPHeaders \| Promise<HTTPHeaders>` | `{}`           | Static headers object or per-request callback |
+| `methodOverride` | `'POST'`                                                                          | none           | Force all requests as POST                    |
+
+## httpBatchLink
+
+Terminating link that batches multiple operations into a single HTTP request.
+
+```ts
+import { httpBatchLink } from '@trpc/client';
+
+httpBatchLink({
+  url: 'http://localhost:3000/trpc',
+  maxURLLength: 2083,
+  maxItems: 10,
+  headers({ opList }) {
+    return { Authorization: `Bearer ${opList[0]?.context.token}` };
+  },
+  transformer: superjson,
+});
+```
+
+| Option           | Type                                                                                    | Default        | Description                                          |
+| ---------------- | --------------------------------------------------------------------------------------- | -------------- | ---------------------------------------------------- |
+| `url`            | `string \| URL`                                                                         | required       | Server endpoint URL                                  |
+| `fetch`          | `typeof fetch`                                                                          | global `fetch` | Fetch ponyfill                                       |
+| `transformer`    | `DataTransformerOptions`                                                                | none           | Data transformer                                     |
+| `headers`        | `HTTPHeaders \| (opts: { opList: Operation[] }) => HTTPHeaders \| Promise<HTTPHeaders>` | `{}`           | Headers callback receives `opList` (array), not `op` |
+| `maxURLLength`   | `number`                                                                                | `Infinity`     | Split batch if URL exceeds this length               |
+| `maxItems`       | `number`                                                                                | `Infinity`     | Maximum operations per batch                         |
+| `methodOverride` | `'POST'`                                                                                | none           | Force all requests as POST                           |
+
+## httpBatchStreamLink
+
+Terminating link similar to httpBatchLink but streams responses as they arrive instead of waiting for all to complete.
+
+```ts
+import { httpBatchStreamLink } from '@trpc/client';
+
+httpBatchStreamLink({
+  url: 'http://localhost:3000/trpc',
+  maxURLLength: 2083,
+  maxItems: 10,
+  transformer: superjson,
+  streamHeader: 'accept',
+});
+```
+
+| Option                      | Type                        | Default         | Description                                                                                       |
+| --------------------------- | --------------------------- | --------------- | ------------------------------------------------------------------------------------------------- |
+| All `httpBatchLink` options |                             |                 | Inherits all httpBatchLink options                                                                |
+| `streamHeader`              | `'trpc-accept' \| 'accept'` | `'trpc-accept'` | Header used to signal streaming. Use `'accept'` to avoid CORS preflight on cross-origin requests. |
+
+Sends `trpc-accept: application/jsonl` (or `Accept: application/jsonl`). Response arrives as `transfer-encoding: chunked` with `content-type: application/jsonl`. Cannot set response headers (including cookies) after stream begins.
+
+## splitLink
+
+Non-terminating link that branches the link chain based on a condition.
+
+```ts
+import {
+  httpBatchLink,
+  httpLink,
+  httpSubscriptionLink,
+  splitLink,
+} from '@trpc/client';
+
+splitLink({
+  condition: (op) => op.type === 'subscription',
+  true: httpSubscriptionLink({ url }),
+  false: httpBatchLink({ url }),
+});
+```
+
+| Option      | Type                         | Default  | Description                                                   |
+| ----------- | ---------------------------- | -------- | ------------------------------------------------------------- |
+| `condition` | `(op: Operation) => boolean` | required | Route predicate                                               |
+| `true`      | `TRPCLink \| TRPCLink[]`     | required | Link(s) for condition=true. Must include a terminating link.  |
+| `false`     | `TRPCLink \| TRPCLink[]`     | required | Link(s) for condition=false. Must include a terminating link. |
+
+Each branch creates its own sub-chain, so both branches need a terminating link.
+
+## loggerLink
+
+Non-terminating link that logs operations to the console.
+
+```ts
+import { loggerLink } from '@trpc/client';
+
+loggerLink({
+  enabled: (opts) =>
+    (process.env.NODE_ENV === 'development' && typeof window !== 'undefined') ||
+    (opts.direction === 'down' && opts.result instanceof Error),
+  colorMode: 'ansi',
+});
+```
+
+| Option        | Type                                                                 | Default                              | Description                      |
+| ------------- | -------------------------------------------------------------------- | ------------------------------------ | -------------------------------- |
+| `enabled`     | `(opts: { direction: 'up' \| 'down'; result?: unknown }) => boolean` | `() => true`                         | Control when logging is active   |
+| `logger`      | `(opts: LoggerOpts) => void`                                         | built-in pretty logger               | Custom log function              |
+| `console`     | `{ log: Function; error: Function }`                                 | `globalThis.console`                 | Console implementation           |
+| `colorMode`   | `'ansi' \| 'css' \| 'none'`                                          | `'css'` in browser, `'ansi'` in Node | Color output mode                |
+| `withContext` | `boolean`                                                            | `false` (true if css)                | Include operation context in log |
+
+## retryLink
+
+Non-terminating link that retries failed operations.
+
+```ts
+import { retryLink } from '@trpc/client';
+
+retryLink({
+  retry(opts) {
+    if (opts.error.data?.code === 'INTERNAL_SERVER_ERROR') {
+      return opts.attempts <= 3;
+    }
+    return false;
+  },
+  retryDelayMs: (attempt) => Math.min(1000 * 2 ** attempt, 30000),
+});
+```
+
+| Option         | Type                                         | Default   | Description                 |
+| -------------- | -------------------------------------------- | --------- | --------------------------- |
+| `retry`        | `(opts: { op, error, attempts }) => boolean` | required  | Return true to retry        |
+| `retryDelayMs` | `(attempt: number) => number`                | `() => 0` | Delay between retries in ms |
+
+When used with subscriptions that use `tracked()`, automatically includes the last known event ID on retry.
+
+## wsLink
+
+Terminating link for WebSocket connections. Requires a `TRPCWebSocketClient`.
+
+```ts
+import { createWSClient, wsLink } from '@trpc/client';
+
+const wsClient = createWSClient({
+  url: 'ws://localhost:3000',
+  connectionParams: () => ({ token: 'supersecret' }),
+  lazy: { enabled: true, closeMs: 10_000 },
+  keepAlive: { enabled: true, intervalMs: 5_000, pongTimeoutMs: 1_000 },
+});
+
+wsLink<AppRouter>({
+  client: wsClient,
+  transformer: superjson,
+});
+```
+
+### wsLink Options
+
+| Option        | Type                     | Default  | Description                          |
+| ------------- | ------------------------ | -------- | ------------------------------------ |
+| `client`      | `TRPCWebSocketClient`    | required | WebSocket client from createWSClient |
+| `transformer` | `DataTransformerOptions` | none     | Data transformer                     |
+
+### createWSClient Options
+
+| Option                    | Type                                                                                     | Default             | Description                                                       |
+| ------------------------- | ---------------------------------------------------------------------------------------- | ------------------- | ----------------------------------------------------------------- |
+| `url`                     | `string \| (() => MaybePromise<string>)`                                                 | required            | WebSocket server URL                                              |
+| `connectionParams`        | `Record<string, string> \| null \| (() => MaybePromise<Record<string, string> \| null>)` | `null`              | Auth params sent as first message, available in `createContext()` |
+| `WebSocket`               | `typeof WebSocket`                                                                       | global `WebSocket`  | WebSocket ponyfill                                                |
+| `retryDelayMs`            | `(attemptIndex: number) => number`                                                       | exponential backoff | Reconnection delay                                                |
+| `onOpen`                  | `() => void`                                                                             | none                | Connection opened callback                                        |
+| `onError`                 | `(evt?: Event) => void`                                                                  | none                | Connection error callback                                         |
+| `onClose`                 | `(cause?: { code?: number }) => void`                                                    | none                | Connection closed callback                                        |
+| `lazy.enabled`            | `boolean`                                                                                | `false`             | Close WS after inactivity                                         |
+| `lazy.closeMs`            | `number`                                                                                 | `0`                 | Idle timeout before closing                                       |
+| `keepAlive.enabled`       | `boolean`                                                                                | `false`             | Send ping messages                                                |
+| `keepAlive.intervalMs`    | `number`                                                                                 | `5000`              | Ping interval                                                     |
+| `keepAlive.pongTimeoutMs` | `number`                                                                                 | `1000`              | Close if no pong within this time                                 |
+
+## httpSubscriptionLink
+
+Terminating link for Server-Sent Events (SSE) subscriptions.
+
+```ts
+import { httpSubscriptionLink } from '@trpc/client';
+import { EventSourcePolyfill } from 'event-source-polyfill';
+
+httpSubscriptionLink({
+  url: 'http://localhost:3000/trpc',
+  connectionParams: async () => ({ token: 'supersecret' }),
+  transformer: superjson,
+  EventSource: EventSourcePolyfill,
+  eventSourceOptions: async ({ op }) => ({
+    headers: {
+      authorization: 'Bearer token',
+    },
+  }),
+});
+```
+
+| Option               | Type                                                                                 | Default              | Description                               |
+| -------------------- | ------------------------------------------------------------------------------------ | -------------------- | ----------------------------------------- |
+| `url`                | `string \| (() => string \| Promise<string>)`                                        | required             | Server endpoint URL                       |
+| `connectionParams`   | `Record<string, string> \| null \| (() => MaybePromise<...>)`                        | none                 | Serialized as URL query param             |
+| `transformer`        | `DataTransformerOptions`                                                             | none                 | Data transformer                          |
+| `EventSource`        | EventSource constructor                                                              | global `EventSource` | EventSource ponyfill for custom headers   |
+| `eventSourceOptions` | `EventSourceInit \| ((opts: { op }) => EventSourceInit \| Promise<EventSourceInit>)` | none                 | Options passed to EventSource constructor |
+
+For cross-domain cookies, use `eventSourceOptions: () => ({ withCredentials: true })`.
+
+## unstable_localLink
+
+Terminating link for direct procedure calls without HTTP. Useful for testing and server-side usage.
+
+```ts
+import { unstable_localLink } from '@trpc/client';
+import { appRouter } from './server';
+
+unstable_localLink({
+  router: appRouter,
+  createContext: async () => ({ db: prisma }),
+  onError: (opts) => console.error('Error:', opts.error),
+});
+```
+
+| Option          | Type                                  | Default  | Description              |
+| --------------- | ------------------------------------- | -------- | ------------------------ |
+| `router`        | `AnyRouter`                           | required | tRPC router instance     |
+| `createContext` | `() => Promise<Context>`              | required | Context factory per call |
+| `onError`       | `(opts: ErrorHandlerOptions) => void` | none     | Error handler            |
+| `transformer`   | `DataTransformerOptions`              | none     | Data transformer         |