Deepen React Native overlay analysis and dismissal

[thymikee]

Context

While fixing iOS interactive snapshots for the collapsed React Native !, Open debugger to view warnings. overlay, we found that overlay behavior is currently split across several modules:

• snapshot presentation decides which overlay accessibility nodes to preserve/suppress
• snapshot warning output separately detects RN overlay text
• react-native dismiss-overlay separately resolves a safe target and sends a coordinate press
• screenshot overlay refs do not have a shared overlay-action model

The current PR fixes the concrete collapsed-overlay bug and moves shared text predicates into src/utils/react-native-overlay-signals.ts, but it does not fully deepen the RN overlay module.

Goal

Create one deep React Native overlay analysis module that exposes a small interface for all callers that need overlay facts.

Proposed direction

Model RN overlays as snapshot analysis artifacts, for example snapshot.overlays[] or snapshot.issues[], with enough data for:

• overlay kind, e.g. LogBox collapsed warning, LogBox expanded warning, RedBox
• severity/reporting metadata
• visible evidence nodes
• safe controls/actions, preferring exposed refs/selectors and marking coordinate fallback explicitly
• agent-facing warnings and next-command guidance
• post-action verification state

Then make these callers consume the same analysis result:

• iOS snapshot presentation preserves/suppresses overlay nodes through the overlay analysis module
• snapshot warnings are generated from the analysis
• react-native dismiss-overlay consumes the safe-action model
• dismissal verifies with a post-action snapshot before reporting final dismissal
• screenshot overlay refs can annotate overlay targets consistently

Acceptance criteria

• One module owns RN overlay recognition vocabulary and safe-action selection.
• Snapshot presentation, warning generation, and react-native dismiss-overlay do not duplicate overlay heuristics.
• Collapsed Open debugger to view warnings overlays remain dismissible on iOS.
• Full-screen warning parents are not exposed as generic app targets.
• RedBox behavior still prefers Minimize over Dismiss.
• Tests cover collapsed LogBox, expanded LogBox, RedBox, no-overlay app copy, and post-dismiss verification behavior.

Notes

This should be a separate improvement from the iOS snapshot presentation PR. That PR should keep only the concrete bug fix and the small predicate extraction.