ci(web): Phase P6 — vite build in PR CI + headless E2E gate on trunk publishes (#1445)

- ci.yml: build step (vite build via turbo) runs on every PR pipeline after test
- publish.yml: e2e step boots the gateway from built dist (HOME/cwd-isolated
  throwaway PGlite) and runs the Playwright suite headless inside
  mcr.microsoft.com/playwright:v1.58.2-noble against the SPA bundle served
  exactly as production serves it; both kaniko publishes now gate on e2e
- serve-spa.ts: strip query strings before asset resolution; immutable
  cache-control for hashed assets (onSend hook); e2e spec covers both
- e2e suite hardened: globalSetup seeds admin+member through real
  bootstrap/better-auth APIs (Origin header for CSRF), loginAs waits for the
  post-login redirect (fixes 27-skipped race), stale #152-era assertions
  rewritten to the current command-driven UI, strict-mode violations fixed
  with level-1 heading queries and .or() auto-retrying locators
- verify-release mirrors the new build stage; playwright artifacts ignored

apps/web/e2e/admin.spec.ts

@@ -31,15 +31,11 @@ test.describe('Admin page — admin user', () => {
     await page.goto('/admin');
     await page.getByRole('button', { name: /system health/i }).click();
     // Health cards or loading indicator should appear
-    const hasLoading = await page
+    const loadingOrCard = page
       .getByText(/loading health/i)
-      .isVisible()
-      .catch(() => false);
-    const hasCard = await page
-      .getByText(/database/i)
-      .isVisible()
-      .catch(() => false);
-    expect(hasLoading || hasCard).toBe(true);
+      .or(page.getByText(/database/i))
+      .first();
+    await expect(loadingOrCard).toBeVisible({ timeout: 10_000 });
   });
 });