April 2025 content build (#15411)

* chore: April 2025 CSS

* chore: April 2025 subscriber and armoire items, backgrounds

* chore: Update April 2025 subscriber items

* chore: April 2025 CSS fix

* chore: April 2025 pet quest and magic hatching potion

* fix: April 2025 fixes

* fix: typo

* fix: typo

* fix(typo): whitespace

---------

Co-authored-by: Kalista Payne <sabrecat@gmail.com>

website/common/script/content/gear/sets/mystery.js

@@ -69,6 +69,7 @@ const armor = {
   202407: { },
   202412: { },
   202502: { },
+  202504: { },
   301404: { },
   301703: { },
   301704: { },
@@ -239,6 +240,7 @@ const head = {
   202501: { },
   202502: { },
   202503: { },
+  202504: { },
   301404: { },
   301405: { },
   301703: { },