feat(swift-ios): start a new thread on the same branch

[saphid]

What Changed

• add New Thread on Same Branch to thread row menus
• seed the new-task sheet from the source project, checkout, and branch
• validate stale or unavailable checkouts and show a useful failure message

Dependency

Stacked on #6135, #6134, and #6117. Review commit 91798e9ab for this feature until those PRs land.

Verification

• ThreadNewTaskSeedTests and the affected new-task/sidebar suites passed on iOS Simulator after conflict resolution
• preserved both the fix(swift-ios): make thread swipe actions safe #6117 delete/undo lifecycle and the seeded new-task presentation
• git diff --check: passed

UI

The row menu opens a prefilled new-task sheet targeting the same branch without mutating the source thread.

Note

Add 'New thread on same branch' action and settle-undo toast to iOS thread sidebar

• Adds a 'New thread on <branch>' context menu and swipe action that pre-seeds NewThreadView with the source thread's branch and worktree, surfacing specific errors when the branch is unavailable.
• Introduces a timed settle-undo toast in the sidebar that lets users reopen a just-settled thread and restore its pin/snooze state, auto-expiring after 5s (15s under VoiceOver/Switch Control).
• Replaces the immediate thread delete action with a confirmation alert before deletion.
• Adds a dynamic Snooze submenu with time-based presets (1 hour, this evening, tomorrow, next week) and copy-to-clipboard actions for thread path, branch, and ID in the context menu.
• setSettled, setSnoozed, and setPinned on FeatureRootModel now return Bool indicating mutation success, used by the undo flow to gate toast presentation.

^{Macroscope summarized 91798e9.}

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