feat(views): surface the issue assignee as an @-tag on the heading

On a team or "by person" view you couldn't tell who owned an issue at a glance: the assignee was captured but folded inside the :LINEAR-ASSIGNEE-NAME: drawer, with nothing in the heading.

I render the assignee as a leading @-tag (:@eric:bug:backend:), behind a pearl-show-assignee defcustom (default on). I picked a tag over a heading suffix because Org strips tags before it hashes the title for sync, so the tag can't corrupt title-sync the way a suffix would. The @ prefix keeps it in its own namespace, separate from label tags: labels are tracked in their drawer, not read back from the heading, so the tag never gets mistaken for a label. The label-edit path preserves any @-tag when it rewrites the heading's tags, and edit-assignee refreshes the @-tag so a reassign doesn't leave a stale name until the next fetch.

Verified live against a by-person view: assigned issues carry their @-tag, unassigned ones stay bare.

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