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/zh-CN.ts

@@ -1644,7 +1644,7 @@ export const zhCN: TranslationResources = {
     title: "Subagent",
     pillLabelOne: "1 个 subagent",
     pillLabelMany: "{{count}} 个 subagent",
-    pillLabelRunning: "{{count}} 个运行中",
+    pillLabelWorking: "{{count}} 个运行中",
     pillLabelFailed: "{{count}} 个失败",
     pillLabelNeedsInputOne: "1 个需要输入",
     pillLabelNeedsInputMany: "{{count}} 个需要输入",