feat(swift-ios): show when a thread title is being regenerated

[t3dotgg]

Tapping "Regenerate title" in the SwiftUI client gave no feedback. The row did not change, the menu item stayed enabled so you could fire it again, and a cached thread detail could republish the old title after the server had already renamed it.

The server already marks a thread with titleRegeneration while it works, and web and React Native drive their pending state from that one field. This does the same in Swift: decode the field, dim the row title and disable the Regenerate title actions while it is set, and copy the shell title into the cached detail when the shell snapshot is at least as new. No client-side request tracking, timers, or synthesized outcomes.

Replaces #8623, which built the same feature with about 1,300 lines of tracker state, request IDs, a 60 second recovery timer, and error-string sniffing on top of a base that has since moved about 1,000 commits.

Tests: a wire fixture decode test for titleRegeneration on shell and detail threads, and a client test that a newer shell title and regeneration state beat a stale cached detail. Ran the touched suites plus HomeThreadSwipeActionTests and FeatureRootModelTests on the iPhone 17 Pro simulator, all green.

Created with Claude Fable 5.1 in Claude Code.

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ No successful main baseline artifact is available yet. This run establishes the initial measurement.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	—	13.5 KiB	—	15.1 KiB	✅
Codex	Thread snapshot wire	—	7.0 KiB	—	7.3 KiB	✅
Codex	Live turn WebSocket wire	—	6.5 KiB	—	7.8 KiB	✅
Codex	Live turn WebSocket decoded	—	57.0 KiB	—	66.4 KiB	✅
Codex	Live turn messages	—	8	—	21	✅
Claude	Total thread wire	—	13.6 KiB	—	15.1 KiB	✅
Claude	Thread snapshot wire	—	7.0 KiB	—	7.3 KiB	✅
Claude	Live turn WebSocket wire	—	6.5 KiB	—	7.8 KiB	✅
Claude	Live turn WebSocket decoded	—	57.8 KiB	—	66.4 KiB	✅
Claude	Live turn messages	—	9	—	21	✅

Baseline: unavailable · PR result: e295851 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 113.9 KiB
• Claude decoded thread snapshot: 114.6 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

[macroscopeapp]

Approvability

Verdict: Approved at e295851

Macroscope's review found this PR approvable — This is a focused Swift iOS UI and model-state enhancement for an existing title-regeneration action, with no new integration or infrastructure impact. The additive wire decoding, stale-detail reconciliation, and state-preservation paths are covered by targeted tests.

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