feat(fp): WP-19 — Playwright e2e smoke against the real FE+backend

Adds a happy-path spec (login → dashboard → registratie wizard, including
a real identity-document upload → real submit) and a degraded-path spec
(?scenario=error → <app-async> error slot → retry), both driving the real
app against the real .NET backend, plus a CI job that boots both.

Writing the retry spec surfaced a real bug: AsyncComponent's retry() only
reloads a [resource]-fed instance, so every real page (all [data]-fed via
a store's RemoteData) had a silently no-op retry button. Added a
retryClicked output and wired it on the dashboard's two async blocks.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -60,6 +60,27 @@ jobs:
       - run: dotnet format backend/BigRegister.slnx --verify-no-changes
       - run: dotnet test backend/BigRegister.slnx
 
+  e2e:
+    # Smoke-level Playwright run against the REAL FE+backend (WP-19) — a fresh
+    # backend process per run, so in-memory state from a prior run never leaks in.
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 24
+          cache: npm
+      - uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 10.0.x
+      - run: npm ci
+      - run: npx playwright install --with-deps chromium
+      - run: dotnet run --project backend/src/BigRegister.Api --urls http://localhost:5000 &
+      - run: npx ng serve --proxy-config proxy.conf.json &
+      - run: npx wait-on http://localhost:5000/swagger http://localhost:4200
+      - run: npm run e2e
+
   codeql:
     # Static analysis (SAST) for both sides; results appear under the Security tab.
     runs-on: ubuntu-latest