fix(mobile): recover from screen render failures

[rynfar]

A render exception in a mobile route, sidebar, conversation feed, or inspector could replace the whole view with an unrecoverable error. This adds bounded error views with Try again, Copy details, and route exit actions. Navigation identity and workspace changes reset a failed subtree; feed failure leaves the composer mounted. The New Task flow keeps its provider and draft selection mounted when a child screen fails, while an outer boundary can still catch provider-level errors.

Adapted from T3 commit 23c7ab901afa66dc8e791a3873b600726a6ba8c7 (#13197). Pylon-specific integration keeps its blur host, rollback props, and existing native button styling. RootStackLayout providers remain outside these per-screen boundaries; this PR covers route, sidebar, feed, and inspector render failures.

Validation: two React renderer regressions passed (retry preserves a sibling/draft host; route identity reset), mobile typecheck, scoped lint and format checks passed, and independent source review cleared the final patch. Lint reports existing warnings in affected large components. No device UI verification was performed because AGENTS.md requires explicit approval.

Model: GPT-6 Sol (low). Harness: Codex in Pylon, with GPT-6 root oversight and independent review.

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Project	Deployment	Actions	Updated
pylon-marketing	Ready	Preview	Sep 24, 2026 8:53am 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	13.9 KiB	−76 B (−0.5%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.2 KiB	7.2 KiB	+9 B (+0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.8 KiB	6.7 KiB	−85 B (−1.2%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	58.0 KiB	58.0 KiB	−88 B (−0.1%)	66.4 KiB	✅
Codex	Live turn messages	10	8	−2 (−20.0%)	21	✅
Claude	Total thread wire	14.0 KiB	14.0 KiB	0 B (0.0%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.2 KiB	7.2 KiB	−1 B (−0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.7 KiB	6.7 KiB	+1 B (+0.0%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	58.9 KiB	58.9 KiB	−44 B (−0.1%)	66.4 KiB	✅
Claude	Live turn messages	10	9	−1 (−10.0%)	21	✅

Baseline: 7ed3f71 · PR result: 9a36871 · 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: 115.6 KiB
• Claude decoded thread snapshot: 116.4 KiB

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