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/playwright.config.ts

@@ -1,23 +1,30 @@
 import { defineConfig, devices } from '@playwright/test';
 
 /**
- * Playwright E2E configuration for Mosaic web app.
+ * Playwright E2E configuration for the Mosaic web SPA.
  *
- * Assumes:
- *   - Next.js web app running on http://localhost:3000
- *   - NestJS gateway running on http://localhost:14242
+ * Assumes the NestJS gateway is already running on http://localhost:14242 and
+ * serving the built SPA bundle (WEB_DIST_DIR pointing at apps/web/dist) — the
+ * same serving path production uses (Phase P5, #1444). Override the target
+ * with PLAYWRIGHT_BASE_URL.
+ *
+ * global-setup seeds the E2E users through the real bootstrap and admin APIs
+ * when the database is empty; against an already-populated environment it
+ * seeds nothing.
  *
  * Run with:   pnpm --filter @mosaicstack/web test:e2e
  */
 export default defineConfig({
   testDir: './e2e',
+  globalSetup: './e2e/global-setup.ts',
   fullyParallel: true,
   forbidOnly: !!process.env['CI'],
   retries: process.env['CI'] ? 2 : 0,
   workers: process.env['CI'] ? 1 : undefined,
-  reporter: 'html',
+  // CI needs the verdict in the step log; the html report is a local tool.
+  reporter: process.env['CI'] ? 'list' : 'html',
   use: {
-    baseURL: process.env['PLAYWRIGHT_BASE_URL'] ?? 'http://localhost:3000',
+    baseURL: process.env['PLAYWRIGHT_BASE_URL'] ?? 'http://localhost:14242',
     trace: 'on-first-retry',
     screenshot: 'only-on-failure',
   },
@@ -27,6 +34,6 @@ export default defineConfig({
       use: { ...devices['Desktop Chrome'] },
     },
   ],
-  // Do NOT auto-start the dev server — tests assume it is already running.
+  // Do NOT auto-start a server — tests assume the gateway is already running.
   // webServer is intentionally omitted so tests can run against a live env.
 });