Add optional verification to react-native dismiss-overlay

[thymikee]

What to build

Add an explicit verification path for agent-device react-native dismiss-overlay so automation can ask the command to confirm that a React Native LogBox or RedBox overlay is gone before continuing. Keep the default fast path unchanged: it should still dismiss and ask the agent to run a fresh snapshot -i -c.

This should be a narrow command-level enhancement, not a geometry rewrite.

Acceptance criteria

• react-native dismiss-overlay keeps the current fast behavior by default.
• A verification option is available for stricter automation, for example --verify.
• Verified success reports verified: true only when a fresh post-dismiss snapshot no longer detects the overlay.
• Ambiguous or still-visible overlays preserve a useful failure or warning payload with the next action for the agent.
• Unit or provider-backed coverage exercises verified success and still-visible overlay behavior.

Blocked by

None - can start immediately