Fix Deployments tab switching and approve/reject actions

Root cause: stella-page-tabs used urlParam="tab" while the component also
read the "view" query param via a manual queryParamMap subscriber. When
stella-page-tabs wrote ?tab=X to the URL, the subscriber re-read the stale
?view= param and reset viewMode back, causing tabs to appear frozen and
approve/reject button clicks to be swallowed by the stale state.

Fix:
- Change stella-page-tabs urlParam from "tab" to "view" so both the
  component and the tab widget use the same query parameter
- Guard the manual subscriber to only update viewMode if it actually
  differs, preventing feedback loops

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

src/Web/StellaOps.Web/src/app/features/releases/releases-activity.component.ts

@@ -173,7 +173,7 @@ function deriveOutcomeIcon(status: string): string {
       <stella-page-tabs
         [tabs]="viewModeTabs"
         [activeTab]="viewMode()"
-        urlParam="tab"
+        urlParam="view"
         (tabChange)="onTabChange($any($event))"
         ariaLabel="Run list views"
       >
@@ -714,12 +714,12 @@ export class ReleasesActivityComponent implements OnInit, OnDestroy {
     });
 
     this.route.queryParamMap.subscribe((params) => {
-      const view = (params.get('view') ?? 'timeline').toLowerCase();
-      if (view === 'timeline' || view === 'table' || view === 'correlations' || view === 'approvals') {
-        this.viewMode.set(view);
-        if (view === 'approvals') this.loadApprovals();
-      } else {
-        this.viewMode.set('timeline');
+      const view = (params.get('view') ?? '').toLowerCase();
+      if (view && (view === 'timeline' || view === 'table' || view === 'correlations' || view === 'approvals')) {
+        if (this.viewMode() !== view) {
+          this.viewMode.set(view);
+          if (view === 'approvals') this.loadApprovals();
+        }
       }
 
       if (params.get('status')) this.statusFilter.set(params.get('status')!);