Two gaps a review found. The this.phone gate on the interpolation interval is what CLAUDE.md says earns the matchMedia call, and every test passed without it — so it is asserted on the timer count now, since a desktop render is empty either way and cannot tell the two apart. Watched failing with the gate removed. The e2e spec left LONG_TRACK playing in a workers: 1 suite against one long-lived app, immediately before four other phone-* specs. Nine specs clear the queue in afterEach for that reason and phone-transport.spec.ts records the flake it caused.