feat: add bark battle browser prototype

src/games/bark-battle/infrastructure/BrowserMicrophoneInput.ts

@@ -0,0 +1,24 @@
+import type { MicrophoneFailureReason } from '../domain/BarkBattleTypes';
+
+export function mapGetUserMediaError(error: unknown): MicrophoneFailureReason {
+  const name = error && typeof error === 'object' && 'name' in error ? String((error as { name?: unknown }).name) : '';
+  if (name === 'NotAllowedError' || name === 'SecurityError') return 'permission-denied';
+  if (name === 'NotFoundError' || name === 'DevicesNotFoundError') return 'not-found';
+  if (name === 'NotReadableError' || name === 'TrackStartError') return 'not-readable';
+  return 'unknown';
+}
+
+export function isMicrophoneApiSupported(windowLike: { isSecureContext?: boolean; navigator?: Navigator | { mediaDevices?: { getUserMedia?: unknown } } }) {
+  if (windowLike.isSecureContext === false) {
+    return { ok: false as const, reason: 'non-secure-context' as const };
+  }
+  const getUserMedia = windowLike.navigator?.mediaDevices?.getUserMedia;
+  if (typeof getUserMedia !== 'function') {
+    return { ok: false as const, reason: 'unsupported' as const };
+  }
+  return { ok: true as const, reason: null };
+}
+
+export function stopMediaStreamTracks(stream: MediaStream) {
+  stream.getTracks().forEach((track) => track.stop());
+}