[codex] Ignore oversized anonymous AX overlay groups

[jacobssdc]

Summary

• ignore oversized anonymous AX groups during accessibility tree normalization
• add a targeted normalization test that preserves valid controls like the tab bar group and tabs

Root cause

Some iOS screens expose an anonymous group AX node whose frame is larger than the simulator screen. The preview overlay treated that node as a valid fullscreen target, so annotation/click mode blocked interaction with the real controls underneath.

What changed

• added a narrow filter in packages/serve-sim/src/ax.ts for anonymous group nodes with near-fullscreen height and width substantially larger than the screen
• exported RawAxeNode and normalizeAxTree so the normalization path can be covered with a unit test
• added packages/serve-sim/src/__tests__/ax-normalization.test.ts

Impact

This keeps the interactive preview usable on affected iOS screens without requiring app-specific workarounds in the mirrored app.

Validation

• reproduced the issue against a real iOS simulator stream where the raw AX tree contained an anonymous oversized group
• confirmed the filtered snapshot still kept valid controls like the tab bar group and tabs
• bun test packages/serve-sim/src/__tests__/ax-normalization.test.ts
• tsc --noEmit
• oxlint
• bun run --filter '*' build

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