Badge already covers icon+label+value+onClick -- exactly HeaderPill's
shape. mara, reviewing the first cut (a bespoke .header-pill matched to
Badge's own CSS values): "cant we reuse the badge component". HeaderPill
now renders <Badge> directly and only owns hiding at count 0 + the
inbox/todos tone (amber/green on the count, same as before). Drops the
now-unused .header-pill* CSS from agent.css entirely.
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