test(e2e): axe-core's WCAG A + AA rules over every page and the player (chromium only); contrast stays with the visual check

frontend/package-lock.json

@@ -23,6 +23,7 @@
         "react-i18next": "^15.7.4"
       },
       "devDependencies": {
+        "@axe-core/playwright": "4.13.0",
         "@babel/core": "7.29.7",
         "@eslint-community/eslint-plugin-eslint-comments": "4.8.1",
         "@eslint/js": "9.39.1",
@@ -91,6 +92,19 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/@axe-core/playwright": {
+      "version": "4.13.0",
+      "resolved": "https://registry.npmjs.org/@axe-core/playwright/-/playwright-4.13.0.tgz",
+      "integrity": "sha512-6YLx+kxXu5GJceG4ozFg+33a2EMTdjYwWGloJ3sb9Kta5pp+ZNS53uxGVog5JetIY8s++P5UrtX+cri+u0VAVg==",
+      "dev": true,
+      "license": "MPL-2.0",
+      "dependencies": {
+        "axe-core": "~4.13.0"
+      },
+      "peerDependencies": {
+        "playwright-core": ">= 1.0.0"
+      }
+    },
     "node_modules/@babel/code-frame": {
       "version": "7.29.7",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.7.tgz",
@@ -3631,6 +3645,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/axe-core": {
+      "version": "4.13.0",
+      "resolved": "https://registry.npmjs.org/axe-core/-/axe-core-4.13.0.tgz",
+      "integrity": "sha512-UzGt8zg7Ny8djbYMhxl2zuEevVa7r2gJjYY5Lwr1xM7+XU2nd6CkIWFTVcCIbAP63vSz71NaVyyuSk9lHKcy0A==",
+      "dev": true,
+      "license": "MPL-2.0",
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/babel-plugin-react-compiler": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/babel-plugin-react-compiler/-/babel-plugin-react-compiler-1.0.0.tgz",