BE-052: todo view — severity bullets on ticket rows; wt-backed rows swap the bullet for a fat-arrow status button

Now:
OPEN

Ordered by gritzko 2026-07-19. The BE-038 todo board lists ticket rows with no severity marker; add a leading bullet (small circle) colored by the ticket's severity: CRIT red, HIGH orange, MED yellow, LOW green. When a worktree named for the ticket exists (//TKT-123 under work/), the bullet is replaced by a one-symbol BUTTON — a fat right-pointing arrow, same severity color — that navigates to status //TKT-123, so a ticket with live work is one click from its tree.

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