Fix tab navigation by removing urlParam from topology shell

The stella-page-tabs component with urlParam="tab" uses query params
for tab state, which conflicts with child route navigation. The shell
uses router.navigate() for child routes, so urlParam must not be set.

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

src/Web/StellaOps.Web/src/app/features/topology/topology-shell.component.ts

@@ -57,7 +57,6 @@ const PAGE_TABS: readonly StellaPageTab[] = [
       <stella-page-tabs
         [tabs]="pageTabs"
         [activeTab]="activeTab()"
-        urlParam="tab"
         ariaLabel="Environments tabs"
         (tabChange)="onTabChange($event)"
       >