refactor(mobile): finalize portability boundary

[richardsolomou]

Problem

The shared migration leaves temporary over-sharing, stale wrappers, and runtime dependency mismatches that should not remain in the final architecture.

Depends on #3641
Refs PostHog/posthog#76229

Changes

Phase 3 keeps native-only presentation in mobile, removes obsolete shared helpers, and applies the intentional compatibility fixes. I upgraded mobile to Expo 57 and React Native 0.86 while restoring React 19.2.6 across the workspace. Completion sounds now use the supported expo-audio package, and the native configuration follows Expo 57's schema.

No new product capability is introduced here.

How did you test this?

• Expo Doctor, 20/20 checks
• Clean Expo prebuild and signed iOS simulator build
• Rendered the app with live data in an iPhone 17 simulator
• 715 shared and 501 mobile tests
• Full monorepo typecheck
• Biome and git diff --check

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

---

Created with PostHog Code

[github-actions]

React Doctor found 10 issues in 2 files · 10 warnings.

10 warnings

src/app/task/index.tsx

• ⚠️ src/app/task/index.tsx:222 Event logic handled in an effect no-event-handler
• ⚠️ src/app/task/index.tsx:223 Event logic handled in an effect no-event-handler
• ⚠️ src/app/task/index.tsx:225 Derived value copied into state no-derived-state
• ⚠️ src/app/task/index.tsx:226 Derived value copied into state no-derived-state

src/features/tasks/composer/TaskChatComposer.tsx

• ⚠️ src/features/tasks/composer/TaskChatComposer.tsx:229 Event logic handled in an effect no-event-handler
• ⚠️ src/features/tasks/composer/TaskChatComposer.tsx:230 Event logic handled in an effect no-event-handler
• ⚠️ src/features/tasks/composer/TaskChatComposer.tsx:232 Data passed to parent via effect no-pass-data-to-parent
• ⚠️ src/features/tasks/composer/TaskChatComposer.tsx:232 Parent kept in sync with a callback effect no-prop-callback-in-effect
• ⚠️ src/features/tasks/composer/TaskChatComposer.tsx:233 Data passed to parent via effect no-pass-data-to-parent
• ⚠️ src/features/tasks/composer/TaskChatComposer.tsx:233 Parent kept in sync with a callback effect no-prop-callback-in-effect

_{Reviewed by React Doctor for commit aae980f.}

[richardsolomou]

• feat(mobile): add Codex task parity #3654
• refactor(mobile): finalize portability boundary #3642 👈 (View in Graphite)
• refactor(mobile): adopt shared interaction semantics #3641
• refactor(mobile): finish shared task and inbox adoption #3640
• refactor(mobile): adopt shared task runtime #3637
• refactor(core): extract shared presentation semantics #3635
• refactor(core): extract permission and composer semantics #3634
• refactor(core): extract repository integration semantics #3633
• refactor(core): extract portable cloud task engine #3608
• refactor(core): rename cloud task service as engine #3624
• refactor(core): extract cloud task policies #3623
• refactor(api-client): extract cloud task transport #3622
• refactor(shared): extract task contracts and model policy #3616
• main

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[greptile-apps]

_{Reviews (1): Last reviewed commit: "Merge posthog-code/share-inbox-automatio..." | Re-trigger Greptile}

[trunk-io]

😎 Merged directly without going through the merge queue, as the queue was empty and the PR was up to date with the target branch - details.

[posthog]

✅ Visual changes approved by @richardsolomou — baseline updated in aae980f.

View this run in PostHog

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