v0.16.3

Follow-ups from a real project's gate on 0.16.2 (FP-20).

Fixed

• Silent tap after scroll ... until: after a scroll the agent now waits (up to 2 s) until the target is actually
  hit-testable before tapping, and the "covered by another widget" warning only fires when the widget at the tap point
  is unrelated to the target (a descendant or ancestor hit, such as a button's inner text, is no longer reported).
• connection refused after a cold launch (Android): while dials are refused the CLI re-creates the adb forward
  every ~3 s, so a forward that vanished no longer turns into a full dial timeout. A refused timeout now says what
  it means (agent never started vs. forward gone).
• iOS simulator port clashes: Address already in use while forwarding now names the process holding the port.

Docs

• wait for idle does not wait for application-level async loads (a list fetched in initState); use
  wait until "<text>" appears after navigation.