fix(mobile): improve keyboard avoiding

[jmeistrich]

What Changed

This should make keyboard avoiding much more stable. It needs DISABLE_COMMIT_PAUSING_MECHANISM to workaround a reanimated issue. See: https://kirillzyusko.github.io/react-native-keyboard-controller/docs/api/components/keyboard-chat-scroll-view#missing-animations-on-ios-new-arch-only

Why

UI Changes

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Remove gated layout animation from mobile thread feed to improve keyboard avoiding

• Removes the 180ms slide animation applied to feed items near the end of the list in ThreadFeed.tsx; feed item layout updates now occur instantly.
• Removes the nearListEnd shared value and associated worklet, simplifying handleScroll to only report header visibility.
• Disables the Reanimated commit pausing mechanism via a static feature flag in package.json.

^{Macroscope summarized aaa1369.}

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Note

Medium Risk
Touches core thread list scroll/keyboard behavior and a global Reanimated build flag; regressions could show as jank when scrolling history or when the keyboard opens, but scope is limited to mobile thread UI.

Overview
Improves keyboard avoiding on the thread chat list by enabling Reanimated’s DISABLE_COMMIT_PAUSING_MECHANISM static feature flag in apps/mobile/package.json, matching the workaround recommended for KeyboardAwareLegendList on iOS New Architecture when keyboard-driven scroll animations misbehave.

Thread feed scrolling no longer uses the custom Reanimated itemLayoutAnimation that slid rows near the list end. That logic (nearListEnd, feedItemLayoutTransition, and related scroll tracking) is removed so layout updates from streaming, keyboard insets, and maintainVisibleContentPosition apply instantly instead of fighting a gated 180ms position animation.

^{Reviewed by Cursor Bugbot for commit aaa1369. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Pair Reanimated commit pausing with the RN flag

With the current Expo build-properties config, the mobile app still builds with the default/stable React Native feature flags, and repo-wide search shows no preventShadowTreeCommitExhaustion or reactNativeReleaseLevel override. Reanimated’s docs for DISABLE_COMMIT_PAUSING_MECHANISM warn that enabling it without React Native’s preventShadowTreeCommitExhaustion can starve React commits and make the app unresponsive, so iOS/New Architecture keyboard flows can trade the missing-animation bug for a worse production freeze.

Useful? React with 👍 / 👎.

[macroscopeapp]

Approvability

Verdict: Needs human review

This PR has an unresolved P1 review comment warning that the DISABLE_COMMIT_PAUSING_MECHANISM Reanimated flag may cause app freezes without a corresponding React Native flag. This substantive concern about production stability warrants human review.

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