chore: apply oxlint fix-suggestions (unused imports + useless fragments)

Scoped to only `no-unused-vars` and `react/jsx-no-useless-fragment` —
the safe subset of --fix-suggestions. Primary changes:

- Remove unused named imports from statements
- Remove unused default/type imports entirely
- Collapse `<><Single/></>` fragments to `<Single/>`

Verified clean: typecheck + format + lint all green.

packages/expo-two-way-audio/examples/flow-api/App.tsx

@@ -1,13 +1,10 @@
 // EventTarget polyfill is required for the Flow SDK to work in React Native
 import "event-target-polyfill";
-import { Buffer } from "buffer";
 import { Button, StyleSheet, Text, View } from "react-native";
-import { Platform } from "react-native";
 
 import {
   type MicrophoneDataCallback,
   type VolumeLevelCallback,
-  getMicrophoneModeIOS,
   initialize,
   playPCMData,
   toggleRecording,
@@ -22,7 +19,7 @@ import {
   useFlow,
   useFlowEventListener,
 } from "@speechmatics/flow-client-react";
-import { useCallback, useEffect, useState, useSyncExternalStore } from "react";
+import { useCallback, useEffect, useState } from "react";
 import { useSharedValue } from "react-native-reanimated";
 import { getFlowAPIJwt } from "./auth";
 import VolumeDisplay from "./volume-display";