feat(app): give composer track pills a segment per state

A mixed fan-out used to collapse the pill to its single most urgent
state, so a red dot beside "1 failed" over a child that was still
working read as the whole fan-out having stopped. Every state present
now gets its own mark and count, in the sidebar's status-group order.

packages/app/src/i18n/resources/es.ts

@@ -1710,7 +1710,7 @@ export const es: TranslationResources = {
     title: "Subagentes",
     pillLabelOne: "1 subagente",
     pillLabelMany: "{{count}} subagentes",
-    pillLabelRunning: "{{count}} en ejecución",
+    pillLabelWorking: "{{count}} en ejecución",
     pillLabelFailed: "{{count}} con error",
     pillLabelNeedsInputOne: "1 necesita datos",
     pillLabelNeedsInputMany: "{{count}} necesitan datos",