feat: detached-runs monitor page (T3 parity)

New Runs sidebar destination listing detached invocations (detach:true)
with phase, current step, project and a Cancel button while
pending/running. Workspace-scoped like Audit/Approvals, polls every 2s.
Detached runs are opt-in (detached.enabled) — the empty state explains
how to enable them. Inline help doc DE+EN. DetachedRun model +
listDetachedRuns/cancelDetachedRun in HubService, backed by the SDK's
listInvocations()/cancelInvocation(). flutter analyze clean; 29 tests
green (sidebar Y-stability updated for the new destination, model
mapping unit-tested).

Screenshot verification (light+dark) deferred — shared desktop in use.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/l10n/app_localizations_en.dart

@@ -2885,4 +2885,55 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get workspaceProtectedHint =>
       'Protected: logically separated in the shared hub — no hard process barrier. Critical engagements use a sealed area.';
+
+  @override
+  String get runsTitle => 'Runs';
+
+  @override
+  String get runsReloadTooltip => 'Reload the runs list';
+
+  @override
+  String get runsEmptyTitle => 'No detached runs';
+
+  @override
+  String get runsEmptyHint =>
+      'Runs submitted with detach stay here until they finish. Detached invocations are opt-in — enable detached.enabled in the operator config to use them.';
+
+  @override
+  String get runsCancelButton => 'Cancel';
+
+  @override
+  String runsCancelSignalled(String flow) {
+    return 'Cancel signalled for $flow.';
+  }
+
+  @override
+  String get runsCancelTooLate =>
+      'The run had already finished — nothing to cancel.';
+
+  @override
+  String runsCurrentStep(String step) {
+    return 'Step: $step';
+  }
+
+  @override
+  String get runsPhasePending => 'Pending';
+
+  @override
+  String get runsPhaseRunning => 'Running';
+
+  @override
+  String get runsPhaseSucceeded => 'Succeeded';
+
+  @override
+  String get runsPhaseFailed => 'Failed';
+
+  @override
+  String get runsPhaseCancelled => 'Cancelled';
+
+  @override
+  String get runsPhaseUnknown => 'Unknown';
+
+  @override
+  String get navRuns => 'Runs';
 }