feat(client): preview thread lifecycle actions until shell receipts

[rynfar]

When settling, snoozing, pinning, or reordering a thread on a remote environment, the shell list currently waits for the command reply and projected event before showing the change. This makes the action feel inert during network delay and can let a late settle/snooze reply navigate away after the user reverses the action.

Preview the eight lifecycle actions in the shared client runtime for web and mobile. The persisted shell remains authoritative: a rejected or interrupted command rolls back, an accepted action stays visible only until its persisted receipt sequence reaches the live shell, and a disconnect clears the preview so a cached shell never presents it as confirmed. Sidebar navigation rechecks the selected thread and current lifecycle state after the reply.

Adapted from T3 source 9ea892e3b365faff31eed294ac38f70d122656b2 for Pylon's environment-scoped shell and command receipts. Provider turns, admissions, project data, and thread details are unchanged.

Validation: 196 focused client-runtime and sidebar logic tests; client-runtime, web, and mobile typechecks; scoped lint and formatting; independent read-only review. No live browser or mobile interaction was performed.

Model: GPT-6 Sol (low) via the Codex harness.

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[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	−33 B (−0.2%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.2 KiB	7.2 KiB	−5 B (−0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.8 KiB	6.7 KiB	−28 B (−0.4%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	58.0 KiB	58.0 KiB	−44 B (−0.1%)	66.4 KiB	✅
Codex	Live turn messages	10	9	−1 (−10.0%)	21	✅
Claude	Total thread wire	14.0 KiB	14.0 KiB	+13 B (+0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.2 KiB	7.2 KiB	−14 B (−0.2%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.7 KiB	6.8 KiB	+27 B (+0.4%)	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	10	10	0 (0.0%)	21	✅

Baseline: 7ed3f71 · PR result: 0e4ae37 · 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: 116.3 KiB

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