Fix Pack creation: clear cache on refresh, trigger CD, navigate on success

PolicyPackStore.refresh() now clears the sessionStorage cache before
fetching, so API responses aren't hidden behind stale cached data.

PolicyWorkspaceComponent fixes:
- Add ChangeDetectorRef.markForCheck() after every async state mutation
  (OnPush was preventing UI updates from plain field assignments)
- Navigate to the new pack on successful creation
- Show clearer error when policy gateway is unreachable (status 0)
- Clear pack cache before navigation so the new pack appears

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

src/Web/StellaOps.Web/src/app/features/policy-studio/services/policy-pack.store.ts

@@ -32,9 +32,18 @@ export class PolicyPackStore {
   }
 
   refresh(): void {
+    this.clearCache();
     this.fetch();
   }
 
+  clearCache(): void {
+    try {
+      sessionStorage.removeItem(this.cacheKey);
+    } catch {
+      /* ignore */
+    }
+  }
+
   private fetch(): void {
     if (!this.canReadPolicyPacks()) {
       this.usingFallback = true;

src/Web/StellaOps.Web/src/app/features/policy-studio/workspace/policy-workspace.component.ts

@@ -1,8 +1,8 @@
 import { CommonModule } from '@angular/common';
-import { Component, ChangeDetectionStrategy, inject, signal } from '@angular/core';
+import { Component, ChangeDetectionStrategy, inject, signal, ChangeDetectorRef } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 import { AuthService, AUTH_SERVICE } from '../../../core/auth';
-import { RouterLink } from '@angular/router';
+import { Router, RouterLink } from '@angular/router';
 
 import { PolicyPackSummary } from '../models/policy.models';
 import { PolicyApiService } from '../services/policy-api.service';
@@ -186,29 +186,36 @@ export class PolicyWorkspaceComponent {
   private readonly packStore = inject(PolicyPackStore);
   private readonly policyApi = inject(PolicyApiService);
   private readonly auth = inject(AUTH_SERVICE) as AuthService;
+  private readonly router = inject(Router);
+  private readonly cdr = inject(ChangeDetectorRef);
 
   constructor() {
     this.loading = true;
     this.applyScopes();
     this.packStore.getPacks().subscribe((packs) => {
-      this.packs = [...packs].sort((a, b) =>
-        b.modifiedAt.localeCompare(a.modifiedAt) || a.id.localeCompare(b.id)
-      );
+      this.packs = this.sortPacks(packs);
       this.loading = false;
+      this.cdr.markForCheck();
     });
   }
 
   refresh(): void {
     this.refreshing = true;
+    this.cdr.markForCheck();
     this.packStore.refresh();
     this.packStore.getPacks().subscribe((packs) => {
-      this.packs = [...packs].sort((a, b) =>
-        b.modifiedAt.localeCompare(a.modifiedAt) || a.id.localeCompare(b.id)
-      );
+      this.packs = this.sortPacks(packs);
       this.refreshing = false;
+      this.cdr.markForCheck();
     });
   }
 
+  private sortPacks(packs: PolicyPackSummary[]): PolicyPackSummary[] {
+    return [...packs].sort((a, b) =>
+      b.modifiedAt.localeCompare(a.modifiedAt) || a.id.localeCompare(b.id)
+    );
+  }
+
   createPack(): void {
     const name = this.newPackName().trim();
     if (!name) return;
@@ -223,16 +230,23 @@ export class PolicyWorkspaceComponent {
         content: '',
       })
       .subscribe({
-        next: () => {
+        next: (pack) => {
           this.newPackName.set('');
           this.newPackDesc.set('');
           this.creating.set(false);
-          this.refresh();
+          this.packStore.clearCache();
+          if (pack?.id) {
+            void this.router.navigate(['/ops/policy/packs', pack.id]);
+          } else {
+            this.refresh();
+          }
         },
         error: (err) => {
-          this.createError.set(
-            err?.error?.message ?? err?.message ?? 'Failed to create policy pack. Please try again.'
-          );
+          const message =
+            err?.status === 0
+              ? 'Cannot reach the policy service. Check that the policy gateway is running.'
+              : err?.error?.message ?? err?.message ?? 'Failed to create policy pack. Please try again.';
+          this.createError.set(message);
           this.creating.set(false);
         },
       });