Sidebar: pin a thread globally, so the project filter doesn't hide it

[devtechdigital]

Ask. Add a "Pin globally" option for pinned threads, so a thread stays at the top of the sidebar whatever the project filter is set to. I have a working prototype and would like a yes or no on the direction before I open a PR.

Problem. I keep the threads that run my other work in an "Orchestration" project: a controller thread that dispatches work to other projects and reports back, and one or two like it. They're pinned. I use the project filter all day.

To get back to the controller I switch the filter to Orchestration, then click the thread. Switching the filter doesn't change the open thread, so if I forget the second click I'm still in the thread from the project I just left. I often forget, and start work in the wrong project.

Pinning doesn't help, because a pin only shows while its project is in the filter.

Proposal. Let a pinned thread be pinned globally.

• On a pinned thread, the context menu offers "Pin globally", and "Pin to project only" to undo it.
• A globally pinned thread ignores the project filter and sits at the top of the pinned list.
• Its pin icon is filled, so you can tell it from a normal pin.
• Unpinning ends it. If you pin the thread again later, it starts as a normal pin.

Nothing else about pins changes. Settle, snooze, drag order and search work as they do today.

With the controller pinned globally, it's one click from any filter, and the filter stays on the project I'm working in.

Prototype. The screenshots are from a prototype of the web and desktop sidebar on current main. It's about 50 lines of app code plus tests. The list of globally pinned threads is kept on the device in localStorage, the same way the sidebar remembers collapsed sections, so there's no server or contract change. It doesn't cover mobile. The new menu and filter tests, the web test suite and the web typecheck pass.

Related.

• feat: pin favorite projects and archive old ones #15990 pins projects so they lead the project pickers. This is the thread-level version, about the filter rather than picker order.
• feat(clients): add a pinned thread view toggle #15883 and feat(web): pinned threads collapse like the sidebar shelves #19690 make pins easier to hide. This goes the other way, for the few threads that should never be hidden.
• feat(projects): add Cursor-style initiatives with a persistent coordinator #16269 proposes a persistent coordinator for a body of work. Pinning a thread globally is a much smaller step for people who already run a coordinator thread by hand.

Questions.

1. Would you take this as a PR?
2. Is keeping the list on the device acceptable for a first version? Syncing it means a field on the thread like the one feat: pin favorite projects and archive old ones #15990 adds to projects, plus a migration, a capability flag and mobile support.
3. Is "Pin globally" the right name?