[PixPMusic]

Problem

On a folded iPhone Duo, several sheets lose part of their width or their header. Git overview and Linked pull requests stop about two-thirds of the way across, leaving an empty strip before the rail. Thread settings is inset twice, and its Done button drops onto the model list. Branches & worktrees has no header on iOS at all. The shared Sheet (composer context, terminal output, worktree setup) runs its first row under the close button in the rail.

Draft: this builds on #20435 and needs an unpublished Screens build (see Blockers).

Change

The first three commits are #20435's, rebased onto main. Review the commits after them.

• Git overview and Linked pull requests use the route's native header through SheetHeader, like the commit sheet since fix(mobile): use native sheet headers and toolbar filters #22390. Their nested header stack and NativeSheetContent are gone. That wrapper read the Duo bar's inset a second time, which caused the inner strip.
• The Git inspector (Git overview as a column on an unfolded Duo) drops NativeSheetContent too. Its column already insets for the rail, so the cards were 195 pt wide in a 279 pt column. The component had no other users and is removed.
• Branches & worktrees gets a native iOS header.
• Git confirm keeps fix(mobile): use the sheet width on iPhone Duo #20435's horizontal bars and opens at 0.55 instead of 0.45, so both actions fit.
• Shared Sheet always uses horizontal bars. Every caller already opted in, so the prop is removed.
• Thread settings, new-task settings and the scheduled-task model picker keep automatic bar placement, so their controls use the Duo rail:
  • The picker stack spans the sheet (nativeContentInsetHorizontally: false), so its header reaches the rail and the content is inset once.
  • With a vertical bar they skip the mail-search toolbar and keep their own toolbar (nativeKeepsBottomToolbar). The rail then shows cancel and confirm at the top, and filter and search grouped at its foot. Without that option, V5 headers merge a screen's bottom toolbar into the trailing group, which put filter between cancel and confirm.
  • At regular width (Duo unfolded landscape) that same toolbar shows filter beside the search field, and the list reserves room for it.
  • Sheet confirm buttons ask for high visibility priority, so a short rail overflows other items instead of hiding confirm.

Scope and approval

This continues #20435, my PR for the Duo sheet width. It came out of an audit of every iOS sheet on iPhone, iPad and a folded and unfolded Duo, where #20435 alone did not explain the inner strip. There is no separate issue.

Blockers

• fix(mobile): use the sheet width on iPhone Duo #20435 needs to land first.
• Screens: react-native-screens-5.0.0-t3.31.tgz is a local build of fork commit 386fab2 (main's t3.30) merged with f0d4b311 (fix(mobile): use the sheet width on iPhone Duo #20435's t3.29). The two came from different fork commits, so neither has the other's change. The merge needs publishing to the fork as the next version, and the tarball regenerating from it.

Verification

Dev clients on the iOS 27.1 iPhone Duo simulator (folded and unfolded, portrait and landscape), an iPhone 18 Pro (iOS 27.0) and an iPad Pro 11-inch (iPadOS 26.5), with synthetic showcase data. I checked each sheet's width, header, rail controls, detents and dismissal from measured element frames and screenshots.

• Folded Duo:
  • Git overview, Linked PRs, Branches, Commit and the shared Sheet fill the sheet (450 of 450 pt in portrait, 662 of 662 in landscape), with native headers.
  • Confirm is centered.
  • Thread settings shows content at 374 pt, with cancel and Done at the top of the rail and filter and search grouped at its foot. Search opens there and filters the list.
• Unfolded landscape: thread settings shows filter beside the search field in a bottom toolbar, and the last row scrolls clear of it.
• Folded landscape: before the grouped toolbar, thread settings kept cancel and Done visible and moved filter and search into the overflow menu, both working from there. The grouped layout is not yet checked in this posture.
• Unfolded Duo, iPhone and iPad: every sheet has a native header and fills its card or the screen.
• Rebased head: checked again on the Duo in folded landscape (Git sheets, thread settings, shared Sheet), and on the iPhone and iPad (Git sheets and thread settings), with the same results.
• Checks: after rebasing onto main, mobile typecheck passes, 201 tests pass in src/native, src/features/threads and src/components, lint reports no errors on changed files, and knip:check passes.
• Not checked:
  • Unfolded landscape screenshots; the layout was measured only.
  • Android, whose sheets are unchanged.

Before (main)	After (this branch)

The before/after pairs are folded-portrait captures of these commits on the previous base. Unfolded Duo, iPhone and iPad after this change:

Duo unfolded landscape	iPhone	iPad

Follow-ups

• Filter while searching: in the Duo rail, filter hides while the search field is open. Keeping it beside the field above the keyboard would need a Screens fork change.
• Environments (Connections) sheet: it still has no title or close button on iOS.
• fix(mobile): iOS sheets scroll to the end and keep their buttons on screen #22417: it also edits Sheet.tsx on iOS. Whichever lands second needs a small rebase.

Model: Claude Opus 5.5 | Harness: Claude Code in T3 Code