feat(compose): @-mention Linear users from a picker

Mentioning a teammate meant recalling their exact Linear handle, dotted last names and all. Now a picker inserts it for you.

In a comment or description compose buffer, typing @ at the start of a word pops a completing-read over the issue team's members, showing "Full Name (@handle)" so you can find someone by name, and inserts @displayName, the bare handle Linear resolves to a mention (no id or link wrapper). C-; L @ (pearl-mention-user) runs the same picker explicitly and also works inline in an issue buffer, resolving the team from the heading at point. An @ mid-word (an email) stays literal, and cancelling the picker leaves a literal @, so neither case is hijacked.

The compose buffer now carries the issue's team id so the picker knows whom to offer. The @ trigger is bound only when a team is in context. @displayName survives the md/org round-trip unchanged, so it reaches Linear intact.

Not yet confirmed: that writing a body with @displayName through the API fires Linear's mention notification (the web app does, and stored bodies carry the bare handle, so it almost certainly round-trips). Worth one self-mention write-test before relying on it.

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