test(smoke): board page smoke guard — assert HTTP 200 + #prab-board (v1.1.0)

Add board page smoke test to 03-admin-plugins.spec.ts under the
'WP Admin — PRAutoBlogger board page' describe block.

The test navigates to /wp-admin/admin.php?page=prautoblogger-board and
asserts:
  1. HTTP 200 (not wp_die 404)
  2. #wpbody visible (authenticated admin session confirmed)
  3. body does NOT contain 'Invalid plugin page' (the wp_die string)
  4. #prab-board container visible (selector from templates/admin/board-page.php)

This guards against the v0.19.1 regression class: PRAutoBlogger_Board_Page
was registered at admin_menu priority 10, before the parent top-level menu
(also 10). WordPress computed the wrong hookname (admin_page_*) at
add_submenu_page() time; at request time it recomputed prautoblogger_page_*,
found nothing, and called wp_die() — 404. The board was un-navigable since
v0.19.0 shipped. With this test in the deploy gate, this failure class is
now un-shippable.

Spec compiles and lists cleanly (npx playwright test --list: 23 tests).
Cannot be validated against prod until v0.19.1 deploys; stated in spec comment.

Agent-Session: board-404-hotfix-20260612

package.json

@@ -1,6 +1,6 @@
 {
   "name": "peptide-e2e",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "Playwright smoke tests for peptiderepo.com (staging + production)",
   "private": true,
   "scripts": {