feat: migrate to Expo SDK 57

[masch]

Problem Description

Expo SDK 57 was released on June 30, 2026 with React Native 0.86. We need to migrate and take advantage of the improvements, while also cleaning up the react-test-renderer override we added in PR #217.

Proposed Solution

Upgrade steps

1. Run npx expo install expo@latest --fix to bump to SDK 57
2. Update peer deps: Reanimated, Worklets, Gesture Handler, etc.
3. Test everything locally (make validate)

react-test-renderer situation

• We currently have an overrides.react-test-renderer = "19.2.7" + bun.lock resolution hack for jest-expo(56)
• Need to check if jest-expo@57 updates its peer dep on react-test-renderer to ^19.2.7 — if yes, the override can be removed
• @testing-library/react-native@14 + test-renderer@1.2 stays as-is (that's the correct setup regardless)

Features to leverage

Feature	Details	Impact
RN 0.86 edge-to-edge fixes	Android edge-to-edge improvements	Low — verify no layout regressions
Light/dark mode emulation	RN DevTools light/dark simulation	Low — dev tooling only
Rendering/layout/animation fixes	Various fixes in 0.86 (601 commits)	Medium — run full test suite
New expo-dev-client setting	Auto-launch recent project or show launcher	Low — nice QoL for dev
expo prebuild changes	Now clears + regenerates native dirs by default	Medium — may affect custom native code
Newer Reanimated/Worklets/Gesture Handler	Updated versions bundled	Medium — check for breaking API changes

Dependencies to update

• expo: ~56.0.12 → ~57.0.0
• react-native: 0.85.3 → 0.86.x
• react-native-webview: 13.17.0 → match SDK 57 expected version
• Potentially remove overrides.react-test-renderer if jest-expo@57 bumps its peer dep
• Various expo-* packages via npx expo install --fix

Alternatives Considered

• Stay on SDK 56 until 58: viable, but SDK 57 is positioned as the "easiest upgrade ever" with no breaking changes from 0.85→0.86
• Skip 57 and wait for 58: unnecessary delay given the non-breaking nature

Additional Context

• Current React version: 19.2.7 (via PR chore(deps): bump react and @types/react #217)
• Expo 57 ships React 19.2.3 — no downgrade needed since we're already above
• RN 0.86 has 601 commits across 1,552 files vs 0.85 — non-breaking but substantial
• See PR chore(deps): bump react and @types/react #217 for the react-test-renderer override details
• SDK 57 changelog: https://expo.dev/changelog/sdk-57