detect the running ota channel from manifest metadata

currentlyRunning.channel is a build-time constant from the native build
config, so it never reflects a manually applied deployment. Read the
channel our update server stamps into each published manifest instead,
falling back to the build constant for embedded launches.

This makes the pull-request channel guards actually fire, so a PR bundle
no longer resets the extra params and reverts itself to the default
channel on startup, and the drawer notice renders again.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/lib/hooks/useOTAUpdates.ts

@@ -3,6 +3,7 @@ import {Alert, AppState, type AppStateStatus} from 'react-native'
 import {nativeBuildVersion} from 'expo-application'
 import {
   checkForUpdateAsync,
+  type CurrentlyRunningInfo,
   fetchUpdateAsync,
   isEnabled,
   reloadAsync,
@@ -36,6 +37,32 @@ function getDeploymentName(channel: string) {
   return pullRequestNumber ? `PR #${pullRequestNumber}` : channel
 }
 
+/**
+ * The channel of the update bundle that is actually running. The
+ * `currentlyRunning.channel` constant only reflects the channel baked into the
+ * native build config, so a manually applied deployment (e.g. a pull request
+ * channel) must be detected from the manifest metadata our update server stamps
+ * into every published update. Embedded launches have no server manifest and
+ * fall back to the build constant.
+ */
+function getRunningChannel(
+  currentlyRunning: CurrentlyRunningInfo | undefined,
+): string | undefined {
+  /*
+   * `metadata` is typed as a bare `object` by expo-manifests, and is absent
+   * entirely from embedded manifests, so narrow it ourselves.
+   */
+  const manifest = currentlyRunning?.manifest as
+    | {metadata?: {channel?: unknown}}
+    | undefined
+  const channel = manifest?.metadata?.channel
+  if (typeof channel === 'string' && channel) {
+    return channel
+  }
+  // The build constant is an empty string rather than null when unconfigured.
+  return currentlyRunning?.channel || undefined
+}
+
 async function setExtraParams() {
   await setExtraParamAsync(
     IS_IOS ? 'ios-build-number' : 'android-build-number',
@@ -85,12 +112,12 @@ async function updateTestflight() {
 export function useApplyPullRequestOTAUpdate() {
   const {currentlyRunning} = useUpdates()
   const [pending, setPending] = useState(false)
-  const currentChannel = currentlyRunning?.channel
+  const currentChannel = getRunningChannel(currentlyRunning)
   const isCurrentlyRunningPullRequestDeployment =
     currentChannel?.startsWith('pull-request')
   /*
    * Covers pull request deployments as well as any other channel we manually
-   * applied an update from. Note that `channel` is null when updates are
+   * applied an update from. Note that the channel is undefined when updates are
    * disabled (e.g. in dev), in which case there's nothing to restore.
    */
   const isCurrentlyRunningNonStandardChannel = Boolean(
@@ -301,7 +328,7 @@ export function useOTAUpdates() {
   const ranInitialCheck = useRef(false)
   const timeout = useRef<NodeJS.Timeout>(undefined)
   const {currentlyRunning, isUpdatePending} = useUpdates()
-  const currentChannel = currentlyRunning?.channel
+  const currentChannel = getRunningChannel(currentlyRunning)
 
   const setCheckTimeout = useCallback(() => {
     timeout.current = setTimeout(async () => {