Pasting a PR link in the new-thread composer should auto-select the matching project

[petar-studocu]

Problem

When I want to start a thread from a pull request, I usually have the PR URL in my clipboard. Today I have to open a new thread (⌘N), pick the right project by hand, and then go through the PR checkout flow.

Proposal

When a PR URL (e.g. https://github.com/org/repo/pull/123) is pasted into the new-thread composer (⌘N on macOS):

1. Parse the forge, owner/repo and PR number from the URL.
2. If a configured project's remote matches that repo, auto-select that project in the project picker.
3. Optionally offer to set up the thread from that PR right away (checkout / worktree, as in the existing "Checkout Pull Request" flow), so the PR link is the whole entry point.

If no project matches, leave the picker unchanged (or show a hint such as "No project set up for org/repo").

Why

It removes the manual project selection step and makes "paste PR link → start working on it" a one-step flow, which is the most common way I start review/fix threads.

Related

• [Feature]: Deep link (t3code://checkout-pr) to open the PR-checkout dialog from outside the app #6816: deep link (t3code://checkout-pr) to open the PR-checkout dialog from outside the app
• [Bug]: PR handoffs (Resolve/Fix/Checkout) check out into an unrelated project when the linked repository has no matching checkout #16455: PR handoffs resolving to the wrong project (same repo → project matching would be needed here)