data: add Pokemblem to catalog + bump fixture counts

FE8 crossover hack (self-hosted in-game banner). Catalog 404 -> 405;
Playwright fixtures updated (405, GBA 204, New Experience 174, Complete 342).
Built and deployed to romhacks.ginnoir.com.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/generated/banner-manifest.json

@@ -253,6 +253,7 @@
   "platinum-redux": "/assets/banners/platinum-redux.jpg",
   "platinum-unlocked": "/assets/banners/platinum-unlocked.jpg",
   "pocket-gaiden": "/assets/banners/pocket-gaiden.webp",
+  "pokemblem": "/assets/banners/pokemblem.png",
   "poketale": "/assets/banners/poketale.png",
   "poketropolis": "/assets/banners/poketropolis.img",
   "pokerogue": "/assets/banners/pokerogue.jpg",