Replace react-tracked and react-use-websocket with useSyncExternalStore (#22386)

* refactor websockets to remove react-tracked

react 19 removed useReducer eager bailout, which broke react-tracked.

react-tracked works by wrapping state in a JavaScript Proxy. When a component reads state.someField, the proxy records that access. On the next state update, it compares only the fields each component actually touched and skips re-renders if those fields are unchanged. Under the hood, this relies on useReducer — and in React 18, useReducer had an "eager bail-out" that short-circuited rendering when the new state was === to the old state. React 19 removed that optimization, so every dispatch now schedules a render regardless, and the proxy comparison runs too late to prevent it.

useSyncExternalStore is a React primitive (added in 18, stable in 19) designed for exactly this pattern: subscribing to an external store:

useSyncExternalStore(
  subscribe,   // (listener) => unsubscribe — called when the store changes
  getSnapshot  // () => value — returns the current value for this subscriber
)

React calls getSnapshot during render and compares the result with Object.is. If the value is the same reference, the component bails out — no re-render. The key difference from react-tracked is that this bail-out is built into React's reconciler, not bolted on via proxy tricks and useReducer.

The per-topic subscription model makes this efficient. Instead of one global store where every subscriber has to check if their fields changed, each useWs("some/topic", ...) call subscribes only to that topic's listener set. When a message arrives for front_door/detect/state, only components subscribed to that exact topic get their listener fired → React calls their getSnapshot → Object.is compares the value → bail-out if unchanged. Components watching back_yard/detect/state are never even notified.

* remove react-tracked and react-use-websocket

* refactor usePolygonStates to use ws topic subscription

* fix TimeAgo refresh interval always returning 1s due to unit mismatch (seconds vs milliseconds)

older events now correctly refresh every minute/hour instead of every second

* simplify

* clean up

* don't resend onconnect

* clean up

* remove patch

web/src/components/dynamic/TimeAgo.tsx

@@ -98,10 +98,10 @@ const TimeAgo: FunctionComponent<IProp> = ({
       return manualRefreshInterval;
     }
 
-    const currentTs = currentTime.getTime() / 1000;
-    if (currentTs - time < 60) {
+    const elapsedMs = currentTime.getTime() - time;
+    if (elapsedMs < 60000) {
       return 1000; // refresh every second
-    } else if (currentTs - time < 3600) {
+    } else if (elapsedMs < 3600000) {
       return 60000; // refresh every minute
     } else {
       return 3600000; // refresh every hour