[dylanjeffers]

Second of five PRs that re-ship #14665 on current main, ordered from lowest to highest risk. Branched off main, independent of the others.

What's in it

Listener leaks and unhandled rejections. None of these are meant to change what the user sees.

harmony

• Modal: the touchmove listener on the modal root was only removed on the next close render, so it leaked on unmount and stacked when onTouchMove or modalRoot changed. It's now removed in the effect cleanup.
• Slider: document mouse/touch listeners leaked when it unmounted mid-drag. They're removed on unmount.

mobile

• GoogleCast: the PlaybackActiveTrackChanged listener was never removed, so it piled up on each reconnect or track change and kept calling stale cast clients. Moved from useAsync to useEffect with a cleanup, and load errors are logged.
• Airplay: cleanup called .stop(), which doesn't exist on the subscription, so the listener was never removed. It now calls .remove().
• useRevertOnCancel: navigation.addListener returns an unsubscribe function, and passing that to removeListener did nothing. The effect now returns the unsubscribe.
• audius-sdk: each concurrent init waiter added a permanent listener. It uses once().
• ChatScreen: the AppState listener effect had no deps array, so it was removed and re-added on every render.

web

• StripeOnRampModal: the onramp_session_updated listener is removed on cleanup (it stacked on each reopen with the same session), and a failed session init is caught and logged.
• foregroundPollingDaemon: the visibilitychange listener is removed when the saga is cancelled.

common

• uuid(): the variant digit came from 'a' & 0x3, which is NaN & 3, so hex letters always became 8. It now parses the digit first. Output format is unchanged. This was in tier 3 in the plan; I moved it here because it only changes the random distribution of one character.

Why this tier

Each fix is local to one component or helper and only touches cleanup paths or error handling.

Verified

• tsc: harmony clean. common, mobile and web show the same errors as origin/main in this checkout, all in untouched files.
• eslint on changed files: clean.
• common vitest and mobile jest: same results as tier 1 (common's pre-existing store/upload/selectors.test.ts failure only).

Not verified

Not run on a device or in a browser. Chromecast, AirPlay and the Stripe onramp in particular were not exercised.

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