fix(mobile): invalidate iOS header cache for search and grouping

[rynfar]

When an iOS 26 header subview changes hidesSharedBackground, react-native-screens reuses its existing UIBarButtonItem, but Pylon's cached leading/trailing item groups still describe its old grouping. A search controller that mounts after a toolbar also leaves cached toolbar items bound to the old search bar. This updates the native cache keys to include the mutable grouping value and the search bar identity used to construct each toolbar.

The patch retains per-placement item identity and only rebuilds the affected placement. Its lockfile patch hash is updated. The owning issue is #153; native visual behavior remains to be verified on a reachable iOS screen before closure.

Validation: frozen offline install applies the patch; git diff --check passes. An independent source review checked cache dependencies, retained references, iOS availability guards, and patch integrity. No native iOS runtime test was performed.

Implemented by GPT-6 Sol in the Codex/Pylon harness.

---

^{Need help on this PR? Tag @codesmith-bot with what you need. Autofix is disabled.}

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

1 Skipped Deployment

Project	Deployment	Actions	Updated
pylon-marketing	Ignored	Preview	Sep 26, 2026 7:39am UTC

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	14.0 KiB	14.0 KiB	−5 B (−0.0%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.3 KiB	7.3 KiB	+7 B (+0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.7 KiB	6.7 KiB	−12 B (−0.2%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	58.0 KiB	58.0 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	9	9	0 (0.0%)	21	✅
Claude	Total thread wire	14.0 KiB	14.0 KiB	+17 B (+0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.3 KiB	7.3 KiB	+7 B (+0.1%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.7 KiB	6.7 KiB	+10 B (+0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	58.9 KiB	58.9 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	9	9	0 (0.0%)	21	✅

Baseline: 4eb835c · PR result: a6bfbeb · 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: 115.7 KiB
• Claude decoded thread snapshot: 116.4 KiB

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

[rynfar]

Reconciled with current pylon at a6bfbeb. The branch diff remains only the react-native-screens Objective-C patch and its lockfile hash; both now include the other merged native patch content. The combined patch SHA-256 matches the lockfile (ab7c425e...), frozen install applied it, and diff check passed. Exact-head CI is running. Native visual proof for the iOS 26 search/grouping transition remains outstanding before merge/issue closure.

[rynfar]

Isolated iPhone 17 / iOS 26.3 validation on the reconciled PR head a6bfbeb77f:

• Frozen install and CocoaPods refresh succeeded. A pinned PylonDev Debug build compiled the patched RNScreens source, installed, and launched on the simulator.
• Paired to disposable backend state containing only this PR's test project. The reachable Threads search header survived focus, typing, keyboard dismissal, text clearing, and reopening without a visible regression.
• This is a nearby-screen smoke test. As documented in iOS header patch: reuse cache key misses hidesSharedBackground and searchController #153, current Pylon screens do not combine the React header subview with the search/grouping transitions needed to exercise the exact cache-key miss. These images do not claim to reproduce that latent path; keep iOS header patch: reuse cache key misses hidesSharedBackground and searchController #153 open for a fixture or future reachable screen.

Resting search header on the patched build:

Focused search header on the patched build: