Skins improvements/fixes (#3943)

* feat: only initialize batch renderer if needed & head storage

* feat: support webp storage of skin renders if supported (falls back to png if not)

* fix: performance improvements with cache loading+saving

* fix: mirrored skins + remove cape model for embedded cape

* feat: antialiasing

* fix: leg jumping & store fbx's for reference

* fix: lint issues

* fix: lint issues

* feat: tweaks to radial spotlight

* fix: app nav btn colors

packages/ui/package.json

@@ -32,6 +32,7 @@
     "@modrinth/utils": "workspace:*",
     "@tresjs/cientos": "^4.3.0",
     "@tresjs/core": "^4.3.4",
+    "@tresjs/post-processing": "^2.4.0",
     "@types/markdown-it": "^14.1.1",
     "@types/three": "^0.172.0",
     "@vintl/how-ago": "^3.0.1",
@@ -41,6 +42,7 @@
     "floating-vue": "^5.2.2",
     "highlight.js": "^11.9.0",
     "markdown-it": "^13.0.2",
+    "postprocessing": "^6.37.6",
     "qrcode.vue": "^3.4.1",
     "three": "^0.172.0",
     "vue-multiselect": "3.0.0",