Sadiq/ios simulator

[MdSadiqMd]

Summary

• Replace iOS Simulator's screenshot polling (~1.7 FPS) with a Swift helper daemon (xero-ios-helper) using ScreenCaptureKit for ~30 FPS frame capture and IndigoHID mach IPC for reliable touch/swipe input
• Add Metro Inspector bridge (Phase 2) for React Native / Expo element-at-point inspection with hover-to-highlight and source file mapping via Metro's CDP WebSocket
• Add native Swift AX inspection (Phase 3) via AXUIElement for element inspection on native iOS apps with "Search project" affordance
• Add Inspect button in toolbar with overlay that shows element type, label, bounds, and source location
• Add Screen Recording TCC permission detection + banner matching existing Accessibility permission flow
• Make ios-grpc a default feature so touch/swipe/HID works out of the box
• All existing paths preserved as fallback: helper → idb_companion → screenshot poll → AppleScript click

Related Issues

Closes #4

Change Type

• Bug fix
• Feature
• Refactor
• Documentation
• Test/build tooling

Testing

• pnpm --dir client test
• pnpm --dir client lint
• cargo check --manifest-path client/src-tauri/Cargo.toml
• Manual Tauri desktop verification
• Not applicable, with reason:

UI Checklist

• Uses ShadCN/Radix UI patterns where possible
• Adds only user-facing UI, with no temporary debug or test UI
• Includes screenshots or recordings for visible UI changes

Notes

• Swift helper (xero-ios-helper) compiled via swiftc in build.rs, bundled as sidecar. Set XERO_SKIP_IOS_HELPER=1 to skip. Binary auto-copied by tauri-dev-runner.sh into Xero Dev.app bundle.
• UDS socket path uses /tmp/xero-ih-{8chars}.sock to stay under macOS's 104-byte sockaddr_un.sun_path limit.
• Permissions required: Screen Recording (ScreenCaptureKit), Accessibility (touch input + AX inspection), Automation/System Events (AppleScript fallback). App identity is dev.sn0w.xero ("Xero" / "Xero Dev" in System Settings).
• iOS 26 boot: Simulator.app must remain visible during cold boot for the display pipeline to initialize. Window auto-minimizes after frame pump starts. Screenshot fallback tolerates up to 60 consecutive failures during boot warmup.
• IndigoHID: Uses mach IPC (same protocol as FBSimulatorControl). Private API isolated in the helper binary. Port names are Xcode-version-stable.
• Metro inspector: Auto-connects on iOS streaming start, probes ports 8081 + 19000-19006. Falls back to AXUIElement for native apps. Inspect button appears in toolbar between Rotate and Stop.
• Status sync: Frontend force-sets status to "streaming"/"idle" after emulator_start/emulator_stop returns to work around async event listener race condition.