feat(mission-control): show running Worker operations in a Running now section

Registry of active verify/merge/rebase/worktree-creation operations in the Worker,
GetActiveOperations snapshot + OperationStarted/OperationEnded hub events, and a
Running now section in Mission Control with ticking elapsed time.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/ClaudeDo.Localization/locales/de.json

@@ -375,6 +375,13 @@
     "empty": "Keine laufenden Aufgaben",
     "settings": "Einstellungen",
     "activity": "Aktivität",
+    "runningNow": "Läuft gerade",
+    "opVerifyMerge": "Verify (Merge)",
+    "opVerifyBatch": "Verify (Batch)",
+    "opMerging": "Merge",
+    "opRebasing": "Rebase",
+    "opCreatingWorktree": "Worktree wird erstellt",
+    "operationsRefreshFailed": "Laufende Operationen konnten nicht geladen werden: {0}",
     "blocked": "Blockiert",
     "running": "Läuft",
     "review": "Im Review",