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/ko.ts

@@ -1674,7 +1674,7 @@ export const ko: TranslationResources = {
     title: "하위 에이전트",
     pillLabelOne: "하위 에이전트 1개",
     pillLabelMany: "하위 에이전트 {{count}}개",
-    pillLabelRunning: "{{count}}개 실행 중",
+    pillLabelWorking: "{{count}}개 실행 중",
     pillLabelFailed: "{{count}}개 실패",
     pillLabelNeedsInputOne: "1개 입력 필요",
     pillLabelNeedsInputMany: "{{count}}개 입력 필요",