June 2025 content build (#15437)

* chore: June 2025 content build

* chore: typo fixing

* chore: corrections to summer 2025 mage armor, spritesheet

* fix(css): rebuild spritesmith-main

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

website/common/script/content/appearance/backgrounds.js

@@ -656,6 +656,9 @@ const backgrounds = {
   backgrounds052025: {
     trail_through_a_forest: { },
   },
+  backgrounds062025: {
+    summer_seashore: { },
+  },
   eventBackgrounds: {
     birthday_bash: {
       price: 0,