feat(mobile): regenerate a thread title from the row menu

[sideeffffect]

What changed

Adds a capability-gated Regenerate title item to the thread row long-press menu, matching the web per-thread action menu. Selecting it dispatches thread.meta.update { regenerateTitle: true }. Shown only when the environment's server advertises the threadTitleRegeneration capability (same gating web uses).

Appears across both list implementations (v1 ThreadListRow and v2 ThreadListV2Row) and both surfaces (Home list + iPad sidebar).

Why

Regenerating a thread's title is available on the web client but was unreachable in the mobile app.

How

• useThreadListActions gains regenerateThreadTitle, reusing the existing updateMetadata command. It carries a per-thread in-flight Set guard (same pattern as the snooze actions) so a rapid second tap can't start duplicate title-generation work before the shell's titleRegeneration flag lands.
• The capability is threaded to the rows as titleRegenerationSupported, alongside the existing settle/snooze/pin flags; the item only renders when supported.

No server, contract, or shared-runtime changes.

Scope

Split out of the original combined PR per request. Sibling PRs: Rename (#5648) and Unarchive.

Testing

• tsc --noEmit, vp fmt --check, vp lint: clean
• Mobile unit suite: 617 tests / 99 files pass

Screenshots

No Android device/emulator available here for before/after images (per CONTRIBUTING.md) — happy to add. The change adds "Regenerate title" to the row long-press menu on capable servers.

🤖 Generated with Claude Code

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Note

Low Risk
Mobile-only UI and metadata command wiring; capability-gated with existing duplicate-request guards and no server or contract changes.

Overview
Brings Regenerate title to mobile thread lists so it matches the web per-thread menu on capable servers.

useThreadListActions adds regenerateThreadTitle, which calls updateMetadata with regenerateTitle: true, checks threadTitleRegeneration, blocks duplicate taps with an in-flight guard and thread.titleRegeneration, and surfaces failures via alerts. Home and the iPad sidebar pass the handler through and derive titleRegenerationSupported from server capabilities like settle/snooze/pin.

v1 (ThreadListRow) and v2 (ThreadListV2Row) long-press menus prepend the action when supported; while regeneration is in progress the item shows Regenerating… and is disabled.

^{Reviewed by Cursor Bugbot for commit 89ee435. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add 'Regenerate title' action to thread list row menus on mobile

• Adds a regenerateThreadTitle action in useThreadListActions.ts that calls updateMetadata with regenerateTitle: true, deduplicates concurrent requests per thread, and shows an alert on failure.
• Both v1 (thread-list-items.tsx) and v2 (thread-list-v2-items.tsx) row components conditionally show the menu item when the server reports capabilities.threadTitleRegeneration === true.
• While regeneration is in progress (thread.titleRegeneration is set), the menu item is disabled and relabeled 'Regenerating…'.
• The capability check and handler are wired through both the home screen and the navigation sidebar.

^{Macroscope summarized 89ee435.}

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR adds a new user-facing feature (regenerate thread title action in row menus) rather than a bug fix or mechanical change. New features introducing new user capabilities warrant human review.

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[sideeffffect]

Regenerate title already landed on main (thread-title-regeneration-menu.ts + the row-menu wiring), so this is now a duplicate. Closing — thanks!