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backend/node_modules/postcss-discard-overridden/LICENSE

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+The MIT License (MIT)
+
+Copyright 2016 Justineo <justice360@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

backend/node_modules/postcss-discard-overridden/README.md

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+# PostCSS Discard Overridden
+
+[PostCSS] plugin to discard overridden `@keyframes` or `@counter-style`.
+
+`@keyframes` or `@counter-style` will be overridden by those who share the same identifiers and appear later in stylesheets. So we can discard all of them except the last one. When defined inside a `@media` or `@supports` rule, `@keyframes` and `@counter-style` rules only override global rules in some of the client browsers so they need handled separately. This plugin has taken care of this and transforms the PostCss AST **safely**.
+
+[PostCSS]: https://github.com/postcss/postcss
+
+```css
+@-webkit-keyframes fade-in {
+  0% {
+    opacity: 0;
+  }
+  100% {
+    opacity: 0.8;
+  }
+}
+@keyframes fade-in {
+  0% {
+    opacity: 0;
+  }
+  100% {
+    opacity: 0.8;
+  }
+}
+@media (max-width: 500px) {
+  @-webkit-keyframes fade-in {
+    0% {
+      opacity: 0;
+    }
+    100% {
+      opacity: 1;
+    }
+  }
+  @keyframes fade-in {
+    0% {
+      opacity: 0;
+    }
+    100% {
+      opacity: 1;
+    }
+  }
+  @-webkit-keyframes fade-in {
+    0% {
+      opacity: 0;
+    }
+    100% {
+      opacity: 0.8;
+    }
+  }
+  @keyframes fade-in {
+    0% {
+      opacity: 0;
+    }
+    100% {
+      opacity: 0.8;
+    }
+  }
+  @supports (display: flex) {
+    @-webkit-keyframes fade-in {
+      0% {
+        opacity: 0;
+      }
+      100% {
+        opacity: 1;
+      }
+    }
+    @keyframes fade-in {
+      0% {
+        opacity: 0;
+      }
+      100% {
+        opacity: 1;
+      }
+    }
+  }
+}
+@-webkit-keyframes fade-in {
+  0% {
+    opacity: 0;
+  }
+  100% {
+    opacity: 1;
+  }
+}
+@keyframes fade-in {
+  0% {
+    opacity: 0;
+  }
+  100% {
+    opacity: 1;
+  }
+}
+```
+
+```css
+@media (max-width: 500px) {
+  @-webkit-keyframes fade-in {
+    0% {
+      opacity: 0;
+    }
+    100% {
+      opacity: 0.8;
+    }
+  }
+  @keyframes fade-in {
+    0% {
+      opacity: 0;
+    }
+    100% {
+      opacity: 0.8;
+    }
+  }
+  @supports (display: flex) {
+    @-webkit-keyframes fade-in {
+      0% {
+        opacity: 0;
+      }
+      100% {
+        opacity: 1;
+      }
+    }
+    @keyframes fade-in {
+      0% {
+        opacity: 0;
+      }
+      100% {
+        opacity: 1;
+      }
+    }
+  }
+}
+@-webkit-keyframes fade-in {
+  0% {
+    opacity: 0;
+  }
+  100% {
+    opacity: 1;
+  }
+}
+@keyframes fade-in {
+  0% {
+    opacity: 0;
+  }
+  100% {
+    opacity: 1;
+  }
+}
+```
+
+## Usage
+
+See the [PostCSS documentation](https://github.com/postcss/postcss#usage) for
+examples for your environment.
+
+## Contributors
+
+See [CONTRIBUTORS.md](https://github.com/cssnano/cssnano/blob/master/CONTRIBUTORS.md).

backend/node_modules/postcss-discard-overridden/package.json

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+{
+  "name": "postcss-discard-overridden",
+  "version": "7.0.1",
+  "description": "PostCSS plugin to discard overridden @keyframes or @counter-style.",
+  "main": "src/index.js",
+  "types": "types/index.d.ts",
+  "files": [
+    "LICENSE",
+    "src"
+  ],
+  "keywords": [
+    "postcss",
+    "css",
+    "postcss-plugin",
+    "at-rules",
+    "@keyframes",
+    "@counter-style"
+  ],
+  "author": "Justineo <justice360@gmail.com>",
+  "license": "MIT",
+  "repository": "cssnano/cssnano",
+  "bugs": {
+    "url": "https://github.com/cssnano/cssnano/issues"
+  },
+  "homepage": "https://github.com/cssnano/cssnano",
+  "engines": {
+    "node": "^18.12.0 || ^20.9.0 || >=22.0"
+  },
+  "devDependencies": {
+    "diff": "^7.0.0",
+    "picocolors": "^1.1.1",
+    "postcss": "^8.5.3"
+  },
+  "peerDependencies": {
+    "postcss": "^8.4.32"
+  }
+}

backend/node_modules/postcss-discard-overridden/src/index.js

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+'use strict';
+const OVERRIDABLE_RULES = new Set(['keyframes', 'counter-style']);
+const SCOPE_RULES = new Set(['media', 'supports']);
+
+/**
+ * @param {string} prop
+ * @return {string}
+ */
+function vendorUnprefixed(prop) {
+  return prop.replace(/^-\w+-/, '');
+}
+
+/**
+ * @param {string} name
+ * @return {boolean}
+ */
+function isOverridable(name) {
+  return OVERRIDABLE_RULES.has(vendorUnprefixed(name.toLowerCase()));
+}
+
+/**
+ * @param {string} name
+ * @return {boolean}
+ */
+function isScope(name) {
+  return SCOPE_RULES.has(vendorUnprefixed(name.toLowerCase()));
+}
+
+/**
+ * @param {import('postcss').AtRule} node
+ * @return {string}
+ */
+function getScope(node) {
+  /** @type {import('postcss').Container<import('postcss').ChildNode> | import('postcss').Document | undefined} */
+  let current = node.parent;
+
+  const chain = [node.name.toLowerCase(), node.params];
+
+  while (current) {
+    if (
+      current.type === 'atrule' &&
+      isScope(/** @type import('postcss').AtRule */ (current).name)
+    ) {
+      chain.unshift(
+        /** @type import('postcss').AtRule */ (current).name +
+          ' ' +
+          /** @type import('postcss').AtRule */ (current).params
+      );
+    }
+    current = current.parent;
+  }
+
+  return chain.join('|');
+}
+
+/**
+ * @type {import('postcss').PluginCreator<void>}
+ * @return {import('postcss').Plugin}
+ */
+function pluginCreator() {
+  return {
+    postcssPlugin: 'postcss-discard-overridden',
+    prepare() {
+      const cache = new Map();
+      /** @type {{node: import('postcss').AtRule, scope: string}[]} */
+      const rules = [];
+
+      return {
+        OnceExit(css) {
+          css.walkAtRules((node) => {
+            if (isOverridable(node.name)) {
+              const scope = getScope(node);
+
+              cache.set(scope, node);
+              rules.push({
+                node,
+                scope,
+              });
+            }
+          });
+
+          rules.forEach((rule) => {
+            if (cache.get(rule.scope) !== rule.node) {
+              rule.node.remove();
+            }
+          });
+        },
+      };
+    },
+  };
+}
+
+pluginCreator.postcss = true;
+module.exports = pluginCreator;