Fix segment picker misusing removable-tag .chip/.chips styling

The new-campaign segment checkboxes reused .chip/.chips, which is
reserved codebase-wide for click-to-remove selected tags (adds a
trailing " x" and removable-tag hover styling). Give the segment
picker its own segmento-opcao/segmento-lista classes with a minimal
non-removable style instead.

public/js/campanhas.js

@@ -27,7 +27,7 @@ const Campanhas = (() => {
     if (!produto) { container.replaceChildren(); return; }
     const { segmentos } = await API.get(`/api/campaigns/segmentos?produto=${encodeURIComponent(produto)}`);
     container.replaceChildren(...segmentos.map((s) =>
-      h('label', { class: 'chip' },
+      h('label', { class: 'segmento-opcao' },
         h('input', { type: 'checkbox', value: s.value, class: 'campanha-segmento-check' }),
         ` ${s.value} (${fmt.format(s.total)})`)
     ));