When a fresh proposal lands in the supervise queue, the
dashboard:
1. Rings the terminal bell via `curses.beep()` so tmux's
`monitor-bell` (or the terminal's own bell-on-activity)
surfaces a notice in the dashboard pane even when the
operator is focused on claude in the right pane.
2. Bolds + green-attrs the `proposals:` pane label and
suffixes it with `(new!)` so a glance at the dashboard
screen catches the alert at a glance.
The highlight tracks the existing per-row green-highlight
window (`_NEW_PROPOSAL_HIGHLIGHT_SEC`). The bell only fires for
NEWLY arrived proposals after the first tick — pre-existing
queue entries on dashboard startup don't ring.
didericis
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