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

.woodpecker/ci.yml

@@ -254,6 +254,18 @@ steps:
     depends_on:
       - typecheck
 
+  # Canonical verify:release stage `build` (#1445, P6): every PR proves the
+  # full workspace build — including the SPA `vite build` — before merge,
+  # instead of leaving build breakage to surface post-merge in publish.yml's
+  # verify step. Same canonical command the publish pipeline's build step runs.
+  build:
+    image: *node_image
+    commands:
+      - *enable_pnpm
+      - pnpm build
+    depends_on:
+      - typecheck
+
 services:
   ci-postgres:
     image: pgvector/pgvector:pg17