fix(mobile): add long-press unarchive menu to archived thread rows

[sideeffffect]

Problem

On Android, archived threads can't be reliably unarchived. The archived-threads screen's rows are the only thread list in the app without a long-press action menu — every other row (home, sidebar) got a ControlPillMenu in the Android support work (#3579), but the archived rows were missed.

That leaves the swipe action as the sole unarchive affordance: swipe a row open, then tap the narrow "Unarchive" button. On Android this is fiddly, and worse — a full swipe on the row triggers Delete, so a slightly-too-far swipe permanently deletes the thread instead of unarchiving it.

The underlying command/decider/projector/reducer path for unarchive is correct and symmetric with archive; this is purely a missing Android-friendly UI affordance.

Fix

Wrap the archived thread row in a ControlPillMenu long-press menu exposing Unarchive and Delete, mirroring the home/sidebar rows:

• Android — anchors a native dropdown to the row (via the injected onLongPress), giving a dependable, non-swipe way to unarchive.
• iOS — renders the standard context menu, consistent with the other thread lists.

Swipe actions are left untouched. Also passes resetKey to the row's ThreadSwipeable so recycled LegendList rows reset their swipe state, matching the home/sidebar lists.

Testing

• tsc --noEmit (mobile) — clean
• vp check (format + lint) — clean
• vp test for features/archive + features/home — 38 passed

🤖 Generated with Claude Code

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Note

Low Risk
UI-only affordance on the archive screen; reuses existing ControlPillMenu and existing unarchive/delete callbacks with no backend or auth changes.

Overview
Archived threads were the only list rows without long-press actions, so on Android unarchive depended on a narrow swipe button and a full swipe could delete instead.

Archived thread rows are wrapped in ControlPillMenu with shouldOpenOnLongPress, exposing Unarchive and Delete the same way as home/sidebar thread rows (native dropdown on Android, context menu on iOS). Swipe-to-unarchive/delete is unchanged.

ThreadSwipeable also gets a resetKey of environmentId:threadId so recycled LegendList rows don’t keep a stale open swipe state, consistent with other thread lists.

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[t3-code]

closing in favor of #5658, the later implementation of the same archived-row unarchive action.