[wSedlacek]

Reopened from closed upstream PR pingdotgg#32385 as a draft for t3.1code.
Idea rank: 75 of 108. Branch is as it was upstream; it likely needs a rebase (modernize) before review.

Summary

• Working shelf orders threads by when they entered Working (newest first), using a live enter stamp so agent wakes do not reshuffle the list
• Snoozed stays soonest-wake / unsnooze order
• Shared helpers cover web and mobile; user docs updated

Test plan

• Enable Working section; start work on two threads and confirm the newer entrant is on top
• Let an agent wake/continue on the older Working thread and confirm order does not jump
• Snooze two threads with different wake times and confirm soonest wake is first
• vp test run packages/client-runtime/src/state/threadInbox.test.ts apps/mobile/src/features/threads/threadListV2.test.ts

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