feat(ios): add full thread row menu

[saphid]

What changed

The SwiftUI thread row now exposes the complete applicable thread workflow from one context menu: new thread on the same branch/worktree, pin/unpin, settle/reopen, snooze/wake, rename, regenerate title, archive/restore, copy path, copy branch, copy thread ID, and delete.

The menu is derived from environment capabilities and current thread state. Title regeneration reports a disabled Regenerating… item while the request is pending. New-thread seeding preserves the selected branch/worktree, including an explicitly seeded branch that is temporarily absent from branch discovery; ordinary deleted branches still fall back normally.

This is one SwiftUI-client outcome. It does not change the React Native client, web, desktop, server, or wire schemas. Mark unread remains intentionally excluded while the server read-status dependency in #5652 is open.

Why

The SwiftUI row menu previously exposed only a subset of the thread workflow. Users could not start related work on the same checkout, choose useful snooze times, reverse snooze/archive/settle states, regenerate titles, or copy thread metadata from the row.

UI evidence

Before

After

Snooze presets

Explicit branch/worktree seeding

Reverse and state-gated actions

Pinned	Settled	Snoozed	Archived

Title-regeneration progress

Interaction video

24-second menu, snooze, and wake interaction video

Verification

• Rebasing target: t3code/rebuild-mobile-app-swift at 0d0c77431c851ff31181fb5f1708f351e0c5e80c.
• Focused Xcode tests: ThreadContextMenuTests and CoreContractTests/testCommandBuildersMatchOrchestrationContract — 14 passed, 0 failed, 0 skipped.
• apps/swift-ios/Scripts/ci-test.sh — 231 tests in 28 suites passed.
• node scripts/generate-swift-wire-fixtures.ts --check — exit 0.
• git diff --check — exit 0.
• Integrated SwiftUI pass on an iPhone 17 Pro simulator running iOS 26.5 against disposable local T3 state.
• Exercised new-thread checkout seeding, rename and restore, regeneration progress, all copy actions, pin/unpin, settle/reopen, snooze/wake, and archive/restore. Delete was presented in destructive styling but deliberately not invoked; the disposable database remained not deleted.
• Capability and unavailable-state gating is covered by focused tests, including unsupported environments and queued/approval/input states where snooze must be disabled.
• A fresh exact-head MacroScope review found that a disconnected project could still advertise branch seeding; the action is now hidden unless its source project is available, with a regression test.

Scope and review note

The effective non-test diff is size:XL. It is deliberately limited to the accepted SwiftUI thread-row-menu outcome, but an XL feature still needs maintainer alignment before merge.

Checklist

• This PR is small and focused (single-purpose, but not small: size:XL)
• I explained exactly what changed and why
• I included before/after screenshots for the visible UI change
• I included state-specific screenshots and a short interaction video
• I ran focused tests, native CI, and an integrated SwiftUI simulator pass

Implemented and reviewed with GPT-5.6 Sol high in the Codex harness through T3 Code.

[coderabbitai]

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[saphid]

Rebased this draft onto the signed SwiftUI base rewrite at 4df1e9b. The only conflict was in NewThreadView; the repair keeps the new activePicker flow and preserves workspaceSelectionIsSeeded = false when a branch is chosen. GitHub now reports the intended 13-file diff (865 additions, 72 deletions), not the rewritten base history. Verification: 12 focused Xcode tests passed, 0 failed; git diff --check passed. New tip: cc44c81.

[saphid]

Closeout receipt for exact head 341a59c60a60a5a6353c41d3be5964e182dd3e9d on target 0d0c77431c851ff31181fb5f1708f351e0c5e80c:

• Fresh GPT-5.6 Sol high minimum-scope review completed across the 13-file SwiftUI-only diff. No remaining actionable finding after the fix below.
• Fresh MacroScope exact-head review: No issues identified (7 code objects reviewed). Its earlier valid disconnected-project branch-seeding finding was fixed by hiding the action unless its source project is available and adding a regression test.
• Focused Xcode tests: 14 passed, 0 failed, 0 skipped.
• apps/swift-ios/Scripts/ci-test.sh: 231 tests in 28 suites passed.
• Exact-head GitHub lanes passed: Check, Test, Mobile Native Static Analysis, Contract fixtures and native tests, and Release Smoke.
• CodeRabbit did not review: its status explicitly says automatic review was skipped.
• The only red status is Vercel marketing preview authorization for the contributor fork; GitHub reports no required checks for this branch.
• GitHub reports the PR mergeable against the current stacking target. No unresolved review threads remain.
• The PR body now contains commit-backed, publicly fetched before/after and state evidence plus a 24-second playable video/mp4. The real disabled Regenerating… transient was captured; no requested transient is being claimed without evidence.

I am retaining draft status. The change is single-purpose but labeled size:XL; under the contribution policy, that needs maintainer scope alignment before presenting it as ready. No maintainer was contacted as part of this closeout.