feat(snooze): choose custom wake date or duration

[rynfar]

Change

Adapts upstream 3be02ae5791480b8c8bf3a13020a932378eca1ba (#11800) to Pylon's existing snooze command, capability gate, receipt, Undo notice, and mobile thread-row actions. Users can choose a local date/time or an elapsed duration in the web/desktop thread menu or mobile v2 row. The five existing presets remain. A shared resolver rejects past/invalid dates and nonexistent spring-forward times; repeated fall-back wall times use the first occurrence, and duration days mean 24 elapsed hours.

The web dialog uses native browser date/time inputs, avoiding a new calendar dependency. The browser/OS supplies their locale-specific calendar presentation. Upstream e1cbb705273a261d26b489f35a7ddca6567d9663 specifically configures an upstream custom calendar's week start and is not claimed as adopted here. The web request host keys each dialog to its own request so a stale close or submit cannot resolve a replacement request; unmount cancels only its matching request.

Scope and verification

• 112 focused shared resolver, menu, and mounted web dialog tests, including DST and request replacement/unmount; client-runtime/web/mobile scoped typechecks and lint pass; formatting and diff checks pass.
• Independent review PASS on exact commit ef3375339e653ccd461d5590bca41f1ec8aeba38, including the request-ownership correction.
• No live browser or native device interaction was performed. Native picker appearance and browser date-input locale presentation need interactive acceptance.

Owning review: #736. No ledger cursor advancement or merge is included.

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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	−73 B (−0.5%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.2 KiB	7.2 KiB	−3 B (−0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.8 KiB	6.7 KiB	−70 B (−1.0%)	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	−3 B (−0.0%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.2 KiB	7.2 KiB	−13 B (−0.2%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.7 KiB	6.8 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	10	10	0 (0.0%)	21	✅

Baseline: 7ed3f71 · PR result: ef33753 · 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.