Make mobile Thread List v2 the default

[juliusmarminge]

What Changed

• Enabled Thread List v2 by default across all mobile app variants.
• Changed the device preference to act as an opt-out toggle.
• Updated loading behavior and tests to preserve the enabled default while preferences load.

Why

Thread List v2 is now the standard mobile experience. This removes variant-specific defaults while preserving an explicit device-level opt-out for users who prefer the previous list.

UI Changes

This changes the default mobile thread-list experience. No screenshots or video were included.

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

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Note

Medium Risk
Production users get a new default thread-list UI; behavior is mitigated by an explicit device opt-out and stable resolution during async preference load.

Overview
Thread List v2 is now the default mobile thread list on every app variant (including production). The Settings → Beta threadListV2Enabled preference is treated as an opt-out when set to false; when unset it resolves to on.

resolveThreadListV2Default and appVariant are removed from resolveThreadListV2Enabled. While preferences are still loading, resolution stays on v2 (true) instead of temporarily forcing v1, so the list does not remount when stored prefs arrive. useThreadListV2Enabled no longer reads expo-constants for variant. Tests and preference comments are updated to match.

^{Reviewed by Cursor Bugbot for commit 4fcd08d. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Make mobile Thread List v2 the default for all app variants

• resolveThreadListV2Enabled in threadListV2.ts now returns true by default regardless of app variant, replacing the previous variant-based logic (development/preview → on, otherwise off).
• The resolveThreadListV2Default helper function is removed; the hook no longer reads appVariant from expo-constants.
• While preferences are still loading, the resolver now returns true (hold the default) instead of false.
• Behavioral Change: Thread List v2 is now opt-out for all users; previously it was only on by default for development and preview builds.

^{Macroscope summarized 4fcd08d.}

[macroscopeapp]

Approvability

Verdict: Needs human review

This PR enables Thread List v2 as the default for all production users. While the code change is simple, this is a feature rollout that changes the default experience for the entire mobile user base, warranting human confirmation before merge.

^{You can customize Macroscope's approvability policy. Learn more.}

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