Add empty states for audit tables and trim Jobs & Queues description

Empty states:
- Audit Log "Recent Events" table: show "No audit events recorded yet." when empty
- Audit Log "All Events" table: show "No events match the current filters." when empty

Descriptions:
- Jobs & Queues: trim verbose 4-line description to single line

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Web/StellaOps.Web/src/app/features/audit-log/audit-log-dashboard.component.ts

@@ -135,6 +135,8 @@ const AUDIT_TABS: StellaPageTab[] = [
                       <td>{{ event.actor.name }}</td>
                       <td class="resource">{{ event.resource.type }}: {{ event.resource.name || event.resource.id }}</td>
                     </tr>
+                  } @empty {
+                    <tr><td colspan="5" style="text-align:center;padding:1.5rem;color:var(--color-text-muted)">No audit events recorded yet.</td></tr>
                   }
                 </tbody>
               </table>

src/Web/StellaOps.Web/src/app/features/audit-log/audit-log-table.component.ts

@@ -119,6 +119,8 @@ import { AuditEvent, AuditLogFilters, AuditModule, AuditAction, AuditSeverity }
                 }
               </td>
             </tr>
+          } @empty {
+            <tr><td colspan="8" style="text-align:center;padding:2rem;color:var(--color-text-muted)">No events match the current filters.</td></tr>
           }
         </tbody>
       </table>

src/Web/StellaOps.Web/src/app/features/platform/ops/platform-jobs-queues-page.component.ts

@@ -78,11 +78,7 @@ interface WorkerRow {
       <header class="jobs-queues__header">
         <div>
           <h1>Jobs & Queues</h1>
-          <p>
-            Truthful execution overview for queue posture, scheduler health, dead-letter recovery,
-            and worker capacity. Execution control continues in the canonical JobEngine, Scheduler,
-            Dead-Letter, and Data Integrity surfaces linked below.
-          </p>
+          <p>Queue posture, scheduler health, dead-letter recovery, and worker capacity.</p>
         </div>
         <div class="jobs-queues__actions">
           <a [routerLink]="OPERATIONS_PATHS.dataIntegrity">Open Data Integrity</a>
@@ -99,6 +95,7 @@ interface WorkerRow {
       <stella-page-tabs
         [tabs]="jobsQueuesTabs"
         [activeTab]="tab()"
+        urlParam="tab"
         (tabChange)="setTab($any($event))"
         ariaLabel="Jobs and queues tabs"
       />