diff --git a/.gitattributes b/.gitattributes
index f98e611..92cdbf0 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -47,6 +47,7 @@
 /stryker.config.mjs             export-ignore
 /tests                          export-ignore
 /vite.config.js                 export-ignore
+/vitest.config.js               export-ignore
 
 # Avoid merge conflicts in CHANGELOG
 # https://about.gitlab.com/2015/02/10/gitlab-reduced-merge-conflicts-by-90-percent-with-changelog-placeholders/
diff --git a/CHANGELOG.md b/CHANGELOG.md
index cf0857d..570b38b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,3 +34,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - refactor(ui): replace the installed-extension tag cloud with a compact Composer namespace ledger.
 - feat(ui): improve Request disclosures, body limits, history navigation, and table spacing.
 - fix(ui): show short class names with full hover titles, standardize Timeline dots and bars on one blue token, and remove the redundant category legend.
+- test: migrate JavaScript unit and mutation tests to Vitest with isolated workers, V8 coverage, per-test mutation analysis, and supported Node.js release ranges.
diff --git a/package-lock.json b/package-lock.json
index a0784ac..30b0727 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,15 +12,17 @@
         "@fontsource/jetbrains-mono": "^5.3.0",
         "@playwright/test": "^1.62.1",
         "@stryker-mutator/core": "^10.0.0",
-        "c8": "^12.0.0",
+        "@stryker-mutator/vitest-runner": "^10.0.0",
+        "@vitest/coverage-v8": "^4.1.11",
         "eslint": "^10.8.0",
         "prettier": "^3.9.6",
         "stylelint": "^17.14.1",
         "stylelint-config-standard-scss": "^17.0.0",
-        "vite": "^8.2.1"
+        "vite": "^8.2.1",
+        "vitest": "^4.1.11"
       },
       "engines": {
-        "node": ">=22.12.0"
+        "node": "^22.12.0 || >=24.0.0"
       }
     },
     "node_modules/@axe-core/playwright": {
@@ -1399,16 +1401,6 @@
         }
       }
     },
-    "node_modules/@istanbuljs/schema": {
-      "version": "0.1.6",
-      "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.6.tgz",
-      "integrity": "sha512-+Sg6GCR/wy1oSmQDFq4LQDAhm3ETKnorxN+y5nbLULOR3P0c14f2Wurzj3/xqPXtasLFfHd5iRFQ7AJt4KH2cw==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
@@ -1819,6 +1811,13 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/@standard-schema/spec": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@standard-schema/spec/-/spec-1.1.0.tgz",
+      "integrity": "sha512-l2aFy5jALhniG5HgqrD6jXLi/rUWrKvqN/qJx6yoJsgKhblVd+iqqU4RCXavm/jPityDo5TCvKMnpjKnOriy0w==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@stryker-mutator/api": {
       "version": "10.0.0",
       "resolved": "https://registry.npmjs.org/@stryker-mutator/api/-/api-10.0.0.tgz",
@@ -1909,6 +1908,44 @@
       "dev": true,
       "license": "Apache-2.0"
     },
+    "node_modules/@stryker-mutator/vitest-runner": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/@stryker-mutator/vitest-runner/-/vitest-runner-10.0.0.tgz",
+      "integrity": "sha512-SHK2/vfvRUpiz7jXPnQMBnr6zLdm69DK03Mo5mPhaZWcRSygrKUqYsPqWsXsK+5ySHzlMTfCyFK5NQ/X9sJFFw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@stryker-mutator/api": "10.0.0",
+        "@stryker-mutator/util": "10.0.0",
+        "semver": "^7.7.4",
+        "tslib": "~2.8.0"
+      },
+      "engines": {
+        "node": ">=22.0.0"
+      },
+      "peerDependencies": {
+        "@stryker-mutator/core": "10.0.0",
+        "vitest": ">=2.0.0"
+      }
+    },
+    "node_modules/@types/chai": {
+      "version": "5.2.3",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-5.2.3.tgz",
+      "integrity": "sha512-Mw558oeA9fFbv65/y4mHtXDs9bPnFMZAL/jxdPFUpOHHIXX91mcgEHbS5Lahr+pwZFR8A7GQleRWeI6cGFC2UA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/deep-eql": "*",
+        "assertion-error": "^2.0.1"
+      }
+    },
+    "node_modules/@types/deep-eql": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/@types/deep-eql/-/deep-eql-4.0.2.tgz",
+      "integrity": "sha512-c9h9dVVMigMPc4bwTvC5dxqtqJZwQPePsWjPlpSOnojbor6pGqdk541lfA7AqFQr5pB1BRdq0juY9db81BwyFw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/esrecurse": {
       "version": "4.3.1",
       "resolved": "https://registry.npmjs.org/@types/esrecurse/-/esrecurse-4.3.1.tgz",
@@ -1930,13 +1967,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/@types/istanbul-lib-coverage": {
-      "version": "2.0.6",
-      "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.6.tgz",
-      "integrity": "sha512-2QF/t/auWm0lsy8XtKVPG19v3sSOQlJe/YHZgfjb/KBBHOGSV+J2q/S671rcq9uTBrLAXmZpqJiaQbMT+zNU1w==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/@types/jsesc": {
       "version": "2.5.1",
       "resolved": "https://registry.npmjs.org/@types/jsesc/-/jsesc-2.5.1.tgz",
@@ -1951,6 +1981,150 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@vitest/coverage-v8": {
+      "version": "4.1.11",
+      "resolved": "https://registry.npmjs.org/@vitest/coverage-v8/-/coverage-v8-4.1.11.tgz",
+      "integrity": "sha512-8MVGEFnJIcdGjcbfKmeq8z0pZHH0JlVtoVZH9Q/qwUp6wyFnEJUBMrw9DCaj+ra3vShGmhavjalMIhPNxZAUcw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@bcoe/v8-coverage": "^1.0.2",
+        "@vitest/utils": "4.1.11",
+        "ast-v8-to-istanbul": "^1.0.0",
+        "istanbul-lib-coverage": "^3.2.2",
+        "istanbul-lib-report": "^3.0.1",
+        "istanbul-reports": "^3.2.0",
+        "magicast": "^0.5.2",
+        "obug": "^2.1.1",
+        "std-env": "^4.0.0-rc.1",
+        "tinyrainbow": "^3.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@vitest/browser": "4.1.11",
+        "vitest": "4.1.11"
+      },
+      "peerDependenciesMeta": {
+        "@vitest/browser": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@vitest/expect": {
+      "version": "4.1.11",
+      "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-4.1.11.tgz",
+      "integrity": "sha512-VX2x5vNJXET47KAFzwERI+KRMtTTCSWTfSMKsW7JsUsXV4psq++e3DvZpuTDOpHcxytiDs6p2nhVb2tVDiiUYw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@standard-schema/spec": "^1.1.0",
+        "@types/chai": "^5.2.2",
+        "@vitest/spy": "4.1.11",
+        "@vitest/utils": "4.1.11",
+        "chai": "^6.2.2",
+        "tinyrainbow": "^3.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
+    "node_modules/@vitest/mocker": {
+      "version": "4.1.11",
+      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-4.1.11.tgz",
+      "integrity": "sha512-2XJVD55d1o5AZous5CCGKS74g/riOj9odEt2bQpCVZeblHyHdnMeFl4jl0XjU21stf4mbjUkew2eXQZt65g5CQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/spy": "4.1.11",
+        "estree-walker": "^3.0.3",
+        "magic-string": "^0.30.21"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "msw": "^2.4.9",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "msw": {
+          "optional": true
+        },
+        "vite": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@vitest/pretty-format": {
+      "version": "4.1.11",
+      "resolved": "https://registry.npmjs.org/@vitest/pretty-format/-/pretty-format-4.1.11.tgz",
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+      "license": "MIT",
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+        "tinyrainbow": "^3.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
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+    "node_modules/@vitest/runner": {
+      "version": "4.1.11",
+      "resolved": "https://registry.npmjs.org/@vitest/runner/-/runner-4.1.11.tgz",
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+      "dev": true,
+      "license": "MIT",
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+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
+    "node_modules/@vitest/snapshot": {
+      "version": "4.1.11",
+      "resolved": "https://registry.npmjs.org/@vitest/snapshot/-/snapshot-4.1.11.tgz",
+      "integrity": "sha512-pN7ikn1ON7h8ee4gIAp4AzyK+zBtJPzVbqOgu5LCEh4VaJVbPQcgYQYJIMGQPXVeJJq1fnfazis7a5pFNPahog==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/pretty-format": "4.1.11",
+        "@vitest/utils": "4.1.11",
+        "magic-string": "^0.30.21",
+        "pathe": "^2.0.3"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
+    "node_modules/@vitest/spy": {
+      "version": "4.1.11",
+      "resolved": "https://registry.npmjs.org/@vitest/spy/-/spy-4.1.11.tgz",
+      "integrity": "sha512-apNa/prQy2qCeywhnixOHPRCgGNhvg7T4Dapfl1GahLp/R+uhBm5cPyFoNVyqsNd2h1nJxL6BqqdIjiABL60YA==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
+    "node_modules/@vitest/utils": {
+      "version": "4.1.11",
+      "resolved": "https://registry.npmjs.org/@vitest/utils/-/utils-4.1.11.tgz",
+      "integrity": "sha512-zTCVGpyFsGWBhllOyKlTw/vnr6D9qxsfSDyfbyZmTyjHw5N/VuvzHpHoQjm2ZJzn4RJgx5w4r7V0er69CmLgPQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/pretty-format": "4.1.11",
+        "convert-source-map": "^2.0.0",
+        "tinyrainbow": "^3.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
     "node_modules/acorn": {
       "version": "8.18.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.18.0.tgz",
@@ -2037,6 +2211,28 @@
       "dev": true,
       "license": "Python-2.0"
     },
+    "node_modules/assertion-error": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-2.0.1.tgz",
+      "integrity": "sha512-Izi8RQcffqCeNVgFigKli1ssklIbpHnCYc6AknXGYoB6grJqyeby7jv12JUQgmTAnIDnbck1uxksT4dzN3PWBA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/ast-v8-to-istanbul": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/ast-v8-to-istanbul/-/ast-v8-to-istanbul-1.0.5.tgz",
+      "integrity": "sha512-UPAgKJFSEGMWSDr3LX4tqnAb4f7KGT8O40Tyx8wbYmmZ/yn58lNCm8h3svs3eXgiGd5AXxz8NDOvXWvicq+rJA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/trace-mapping": "^0.3.31",
+        "estree-walker": "^3.0.3",
+        "js-tokens": "^10.0.0"
+      }
+    },
     "node_modules/astral-regex": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-2.0.0.tgz",
@@ -2140,40 +2336,6 @@
         "node": "^6 || ^7 || ^8 || ^9 || ^10 || ^11 || ^12 || >=13.7"
       }
     },
-    "node_modules/c8": {
-      "version": "12.0.0",
-      "resolved": "https://registry.npmjs.org/c8/-/c8-12.0.0.tgz",
-      "integrity": "sha512-4zpJvrd1nKWutnnKC2pXkFmb6iM1l+ffN//o1CzlTNwW7GSOs9a1xrLqkC48nU8oEkjmPZLPiwMsIaOvoF4Pqg==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "@bcoe/v8-coverage": "^1.0.1",
-        "@istanbuljs/schema": "^0.1.3",
-        "find-up": "^5.0.0",
-        "foreground-child": "^3.1.1",
-        "istanbul-lib-coverage": "^3.2.0",
-        "istanbul-lib-report": "^3.0.1",
-        "istanbul-reports": "^3.1.6",
-        "test-exclude": "^8.0.0",
-        "v8-to-istanbul": "^9.0.0",
-        "yargs": "^18.0.0",
-        "yargs-parser": "^21.1.1"
-      },
-      "bin": {
-        "c8": "bin/c8.js"
-      },
-      "engines": {
-        "node": "^20.19.0 || ^22.12.0 || >=23"
-      },
-      "peerDependencies": {
-        "monocart-coverage-reports": "^2"
-      },
-      "peerDependenciesMeta": {
-        "monocart-coverage-reports": {
-          "optional": true
-        }
-      }
-    },
     "node_modules/cacheable": {
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/cacheable/-/cacheable-2.5.0.tgz",
@@ -2260,6 +2422,16 @@
       ],
       "license": "CC-BY-4.0"
     },
+    "node_modules/chai": {
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-6.2.2.tgz",
+      "integrity": "sha512-NUPRluOfOiTKBKvWPtSD4PhFvWCqOi0BGStNWs57X9js7XGTprSmFoz5F0tWhR4WPjNeR9jXqdC7/UpSJTnlRg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/chalk": {
       "version": "5.6.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-5.6.2.tgz",
@@ -2290,39 +2462,6 @@
         "node": ">= 12"
       }
     },
-    "node_modules/cliui": {
-      "version": "9.0.1",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-9.0.1.tgz",
-      "integrity": "sha512-k7ndgKhwoQveBL+/1tqGJYNz097I7WOvwbmmU2AR5+magtbjPWQTS1C5vzGkBC8Ym8UWRzfKUzUUqFLypY4Q+w==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "string-width": "^7.2.0",
-        "strip-ansi": "^7.1.0",
-        "wrap-ansi": "^9.0.0"
-      },
-      "engines": {
-        "node": ">=20"
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-    "node_modules/cliui/node_modules/string-width": {
-      "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/string-width/-/string-width-7.2.0.tgz",
-      "integrity": "sha512-tsaTIkKW9b4N+AEj+SVA+WhJzV7/zMhcSu78mLKWSk7cXMOSHsBKFWUs0fWwq8QyK3MgJBQRX6Gbi4kYbdvGkQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "emoji-regex": "^10.3.0",
-        "get-east-asian-width": "^1.0.0",
-        "strip-ansi": "^7.1.0"
-      },
-      "engines": {
-        "node": ">=18"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
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-    },
     "node_modules/color-convert": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
@@ -2578,6 +2717,13 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/es-module-lexer": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/es-module-lexer/-/es-module-lexer-2.3.2.tgz",
+      "integrity": "sha512-poHGpORABojJJucnV9KbOavETW8lBVnphkW77ER5/BQ5Fz7oXSoCNek7IH3vR5nRjdsEz926ibFYX8KtLQmdyw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/es-object-atoms": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/es-object-atoms/-/es-object-atoms-1.1.2.tgz",
@@ -2783,6 +2929,16 @@
         "node": ">=4.0"
       }
     },
+    "node_modules/estree-walker": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-3.0.3.tgz",
+      "integrity": "sha512-7RUKfXgSMMkzt6ZuXmqapOurLGPPfgj6l9uRZ7lRGolvk0y2yocc35LdcxKC5PQZdn2DMqioAQ2NoWcrTKmm6g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/estree": "^1.0.0"
+      }
+    },
     "node_modules/esutils": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.3.tgz",
@@ -2820,6 +2976,16 @@
         "url": "https://github.com/sindresorhus/execa?sponsor=1"
       }
     },
+    "node_modules/expect-type": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/expect-type/-/expect-type-1.4.0.tgz",
+      "integrity": "sha512-KfYbmpRm0VbLjEvVa9yGwCi9GI34xvi7A/HXYWQO65CSD2u3MczUJSuwXKFIxlGsgBQizV9q5J9NHj4VG0n+pA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=12.0.0"
+      }
+    },
     "node_modules/fast-deep-equal": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
@@ -3015,23 +3181,6 @@
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       "license": "ISC"
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-    "node_modules/foreground-child": {
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-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "cross-spawn": "^7.0.6",
-        "signal-exit": "^4.0.1"
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-      "engines": {
-        "node": ">=14"
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-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
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@@ -3067,16 +3216,6 @@
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-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-18.1.0.tgz",
-      "integrity": "sha512-2rAgRKu54VsHkqI0/tYkmluGXHD4KW7yZoycuqDQ15QOTnc2VVfy0nN/1eMhnQLO00A+dwtK20xuCnc1YGeUyg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "cliui": "^9.0.1",
-        "escalade": "^3.1.1",
-        "get-caller-file": "^2.0.5",
-        "string-width": "^8.2.1",
-        "y18n": "^5.0.5",
-        "yargs-parser": "^22.0.0"
-      },
-      "engines": {
-        "node": "^20.19.0 || ^22.12.0 || >=23"
-      }
-    },
-    "node_modules/yargs-parser": {
-      "version": "21.1.1",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
-      "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
-      "dev": true,
-      "license": "ISC",
-      "engines": {
-        "node": ">=12"
-      }
-    },
-    "node_modules/yargs/node_modules/yargs-parser": {
-      "version": "22.0.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-22.0.0.tgz",
-      "integrity": "sha512-rwu/ClNdSMpkSrUb+d6BRsSkLUq1fmfsY6TOpYzTwvwkg1/NRG85KBy3kq++A8LKQwX6lsu+aWad+2khvuXrqw==",
-      "dev": true,
-      "license": "ISC",
-      "engines": {
-        "node": "^20.19.0 || ^22.12.0 || >=23"
-      }
-    },
     "node_modules/yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
diff --git a/package.json b/package.json
index 6f4eaf6..12bff21 100644
--- a/package.json
+++ b/package.json
@@ -6,13 +6,13 @@
   "scripts": {
     "build": "vite build",
     "dev": "vite build --watch",
-    "format": "prettier --write 'resources/{src,tests}/**/*.js' 'e2e/**/*.js' 'tools/**/*.{mjs,json}' 'docs/**/*.md' 'playwright.config.js' 'vite.config.js' 'stryker.config.mjs' 'package.json'",
-    "format:check": "prettier --check 'resources/{src,tests}/**/*.js' 'e2e/**/*.js' 'tools/**/*.{mjs,json}' 'docs/**/*.md' 'playwright.config.js' 'vite.config.js' 'stryker.config.mjs' 'package.json'",
+    "format": "prettier --write 'resources/{src,tests}/**/*.js' 'e2e/**/*.js' 'tools/**/*.{mjs,json}' 'docs/**/*.md' 'playwright.config.js' 'vite.config.js' 'vitest.config.js' 'stryker.config.mjs' 'package.json'",
+    "format:check": "prettier --check 'resources/{src,tests}/**/*.js' 'e2e/**/*.js' 'tools/**/*.{mjs,json}' 'docs/**/*.md' 'playwright.config.js' 'vite.config.js' 'vitest.config.js' 'stryker.config.mjs' 'package.json'",
     "lint:css": "stylelint --config .github/linters/.stylelintrc.json --config-basedir . 'resources/src/**/*.css'",
     "lint:css:fix": "stylelint --config .github/linters/.stylelintrc.json --config-basedir . --fix 'resources/src/**/*.css'",
-    "lint:js": "eslint --config .github/linters/eslint.config.mjs resources e2e tools playwright.config.js",
-    "lint:js:fix": "eslint --config .github/linters/eslint.config.mjs --fix resources e2e tools playwright.config.js",
-    "test:js": "c8 node --test resources/tests/*.test.js",
+    "lint:js": "eslint --config .github/linters/eslint.config.mjs resources e2e tools playwright.config.js vitest.config.js",
+    "lint:js:fix": "eslint --config .github/linters/eslint.config.mjs --fix resources e2e tools playwright.config.js vitest.config.js",
+    "test:js": "vitest run --coverage",
     "test:mutation": "stryker run",
     "fixtures:seed": "php tools/seed-debug-fixtures.php",
     "check:size": "node tools/check-asset-size.mjs",
@@ -29,25 +29,8 @@
     "test:perf:live": "playwright test e2e/live-performance.spec.js --project=desktop-1440",
     "test:browser": "playwright test e2e/smoke.spec.js e2e/security.spec.js e2e/accessibility.spec.js e2e/visual.spec.js"
   },
-  "c8": {
-    "all": true,
-    "include": [
-      "resources/src/**/*.js"
-    ],
-    "exclude": [
-      "resources/src/core/debug.js",
-      "resources/src/toolbar/element.js",
-      "resources/src/toolbar/index.js"
-    ],
-    "reports-dir": "runtime/coverage-js",
-    "temp-directory": "runtime/coverage-js/tmp",
-    "check-coverage": true,
-    "lines": 100,
-    "branches": 100,
-    "functions": 100
-  },
   "engines": {
-    "node": ">=22.12.0"
+    "node": "^22.12.0 || >=24.0.0"
   },
   "devDependencies": {
     "@axe-core/playwright": "^4.13.0",
@@ -55,12 +38,14 @@
     "@fontsource/jetbrains-mono": "^5.3.0",
     "@playwright/test": "^1.62.1",
     "@stryker-mutator/core": "^10.0.0",
-    "c8": "^12.0.0",
+    "@stryker-mutator/vitest-runner": "^10.0.0",
+    "@vitest/coverage-v8": "^4.1.11",
     "eslint": "^10.8.0",
     "prettier": "^3.9.6",
     "stylelint": "^17.14.1",
     "stylelint-config-standard-scss": "^17.0.0",
-    "vite": "^8.2.1"
+    "vite": "^8.2.1",
+    "vitest": "^4.1.11"
   },
   "license": "BSD-3-Clause"
 }
diff --git a/resources/tests/clipboard.test.js b/resources/tests/clipboard.test.js
index 55e64bf..71707a3 100644
--- a/resources/tests/clipboard.test.js
+++ b/resources/tests/clipboard.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 import { bindCopyControls, copyControlText } from "../src/core/clipboard.js";
 
diff --git a/resources/tests/db.test.js b/resources/tests/db.test.js
index 3c2f353..a6b7d3f 100644
--- a/resources/tests/db.test.js
+++ b/resources/tests/db.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 class ClassList {
   constructor() {
@@ -248,6 +248,28 @@ test("N+1 group links filter query rows and expose live progress", () => {
   assert.equal(clear.hidden, true);
 });
 
+test("N+1 filtering tolerates orphan markers and missing optional controls", () => {
+  var orphan = new Element();
+
+  orphan.setAttribute("data-yii-debug-n1-group", "group-orphan");
+  orphan.closest = () => null;
+
+  var root = {
+    querySelector() {
+      return null;
+    },
+    querySelectorAll(selector) {
+      return selector === "[data-yii-debug-n1-group]" ? [orphan] : [];
+    },
+  };
+
+  assert.deepEqual(applyNPlusOneFilter(root, "group-orphan"), {
+    activeGroup: "group-orphan",
+    total: 0,
+    visible: 0,
+  });
+});
+
 test("native explain-all control synchronizes batch state and loading semantics", () => {
   assert.equal(explainAll.textContent, "Explain all");
   assert.equal(explainAll.getAttribute("aria-expanded"), "false");
@@ -327,15 +349,37 @@ test("collapsing an EXPLAIN batch cancels active and queued requests", () => {
   });
 
   var requestCount = requests.length;
+  var originalShift = Array.prototype.shift;
 
-  explainAll.dispatchEvent(new Event("click"));
+  Array.prototype.shift = function () {
+    var task = originalShift.call(this);
+
+    if (task && task.toggle === toggles[0]) {
+      task.cancelled = true;
+    }
+
+    return task;
+  };
+
+  try {
+    explainAll.dispatchEvent(new Event("click"));
+  } finally {
+    Array.prototype.shift = originalShift;
+  }
 
   assert.equal(requests.length, requestCount + 3);
+  assert.equal(requests[requestCount].url, toggles[1].href);
   assert.equal(explainAll.textContent, "Explaining 0/5");
 
   var activeRequests = requests.slice(requestCount);
 
-  explainAll.dispatchEvent(new Event("click"));
+  toggles[4].closest = () => null;
+
+  try {
+    explainAll.dispatchEvent(new Event("click"));
+  } finally {
+    toggles[4].closest = () => containers[4];
+  }
 
   assert.equal(requests.length, requestCount + 3);
   activeRequests.forEach((request) => {
diff --git a/resources/tests/deep-links.test.js b/resources/tests/deep-links.test.js
index 1b7ac02..b524182 100644
--- a/resources/tests/deep-links.test.js
+++ b/resources/tests/deep-links.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 import {
   enhanceSectionPermalinks,
diff --git a/resources/tests/dom.test.js b/resources/tests/dom.test.js
index 1b5683d..368cbdb 100644
--- a/resources/tests/dom.test.js
+++ b/resources/tests/dom.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 import { AJAX_TIMEOUT, ajax, on } from "../src/core/dom.js";
 
@@ -197,7 +197,11 @@ test("ajax settles once and ignores non-final ready states", () => {
   request.status = 500;
 
   ajax("https://example.test/debug/db-explain");
+  request.readyState = 4;
+  request.status = 500;
   request.onreadystatechange();
+
+  ajax("https://example.test/debug/db-explain");
   request.onabort();
   request.ontimeout();
 
diff --git a/resources/tests/dropdown.test.js b/resources/tests/dropdown.test.js
index 8feb7d0..d30650f 100644
--- a/resources/tests/dropdown.test.js
+++ b/resources/tests/dropdown.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 import { dropdownNavigationIndex } from "../src/core/dropdown.js";
 
diff --git a/resources/tests/features.test.js b/resources/tests/features.test.js
index c2a9479..ff59aef 100644
--- a/resources/tests/features.test.js
+++ b/resources/tests/features.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 import {
   loadPanelFeatures,
diff --git a/resources/tests/history-cursor-default.test.js b/resources/tests/history-cursor-default.test.js
index 9ca4779..df4b865 100644
--- a/resources/tests/history-cursor-default.test.js
+++ b/resources/tests/history-cursor-default.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 var scrolls = [];
 var clickHandler = null;
diff --git a/resources/tests/history-cursor-no-rows.test.js b/resources/tests/history-cursor-no-rows.test.js
index 54a345d..45b68a0 100644
--- a/resources/tests/history-cursor-no-rows.test.js
+++ b/resources/tests/history-cursor-no-rows.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 var sectionCalls = 0;
 
diff --git a/resources/tests/history-cursor-no-section.test.js b/resources/tests/history-cursor-no-section.test.js
index eecb211..633fb5d 100644
--- a/resources/tests/history-cursor-no-section.test.js
+++ b/resources/tests/history-cursor-no-section.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 var rowQueries = 0;
 
diff --git a/resources/tests/history-cursor.test.js b/resources/tests/history-cursor.test.js
index 41a90a3..4bd9a7f 100644
--- a/resources/tests/history-cursor.test.js
+++ b/resources/tests/history-cursor.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 var prevented = 0;
 var scrolls = [];
diff --git a/resources/tests/phpinfo-search-init.test.js b/resources/tests/phpinfo-search-init.test.js
index 1929491..96e3d0f 100644
--- a/resources/tests/phpinfo-search-init.test.js
+++ b/resources/tests/phpinfo-search-init.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 class ClassList {
   constructor() {
diff --git a/resources/tests/phpinfo-search.test.js b/resources/tests/phpinfo-search.test.js
index 8c81058..991a79e 100644
--- a/resources/tests/phpinfo-search.test.js
+++ b/resources/tests/phpinfo-search.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 import {
   formatPhpInfoFilteredCount,
diff --git a/resources/tests/tabs.test.js b/resources/tests/tabs.test.js
index cf971fb..257fe19 100644
--- a/resources/tests/tabs.test.js
+++ b/resources/tests/tabs.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 import {
   activateTab,
diff --git a/resources/tests/theme.test.js b/resources/tests/theme.test.js
index 134c7fb..fc1baba 100644
--- a/resources/tests/theme.test.js
+++ b/resources/tests/theme.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 import {
   addThemeToDebugUrl,
diff --git a/resources/tests/toolbar-messaging-nofetch.test.js b/resources/tests/toolbar-messaging-nofetch.test.js
index 1b8f14a..f38a8de 100644
--- a/resources/tests/toolbar-messaging-nofetch.test.js
+++ b/resources/tests/toolbar-messaging-nofetch.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 globalThis.window = {
   location: new URL("https://example.test/"),
diff --git a/resources/tests/toolbar-messaging.test.js b/resources/tests/toolbar-messaging.test.js
index 3db17aa..890825e 100644
--- a/resources/tests/toolbar-messaging.test.js
+++ b/resources/tests/toolbar-messaging.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 var failNextFetch = false;
 var fetchCalls = [];
@@ -238,6 +238,13 @@ test("request tracking skips toolbar, cross-origin, and skip-listed URLs", async
     return name === "data-skip-urls" ? '["/api/health"]' : null;
   };
 
+  var skippedXhr = new XMLHttpRequest();
+
+  skippedXhr.open("GET", "/debug/default/toolbar?tag=page");
+  assert.equal(skippedXhr.readyState, 1);
+  assert.equal(skippedXhr.listeners.has("readystatechange"), false);
+  assert.equal(requestStack.length, startIndex);
+
   await window.fetch(undefined).catch(function () {});
   await window.fetch("https://[bad");
   await window.fetch("https://attacker.test/api/items");
diff --git a/resources/tests/toolbar-runtime.test.js b/resources/tests/toolbar-runtime.test.js
index 1f0b426..16ac9b9 100644
--- a/resources/tests/toolbar-runtime.test.js
+++ b/resources/tests/toolbar-runtime.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 import { renderPhpBrand, renderYiiBrand } from "../src/toolbar/brand.js";
 import { builtinIconUrl } from "../src/toolbar/icons.js";
diff --git a/resources/tests/toolbar-state.test.js b/resources/tests/toolbar-state.test.js
index fce1123..0963a89 100644
--- a/resources/tests/toolbar-state.test.js
+++ b/resources/tests/toolbar-state.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 function createStorage() {
   var items = new Map();
diff --git a/resources/tests/toolbar-theme.test.js b/resources/tests/toolbar-theme.test.js
index bf4db02..3648e7c 100644
--- a/resources/tests/toolbar-theme.test.js
+++ b/resources/tests/toolbar-theme.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 globalThis.window = {
   location: new URL("https://example.test/"),
diff --git a/resources/tests/userswitch-guard.test.js b/resources/tests/userswitch-guard.test.js
index 6964055..5eec212 100644
--- a/resources/tests/userswitch-guard.test.js
+++ b/resources/tests/userswitch-guard.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 var clickHandler = null;
 var reloads = 0;
diff --git a/resources/tests/userswitch-row.test.js b/resources/tests/userswitch-row.test.js
index 94971d2..dbdbdb6 100644
--- a/resources/tests/userswitch-row.test.js
+++ b/resources/tests/userswitch-row.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 var handlers = {};
 var sends = 0;
diff --git a/resources/tests/userswitch.test.js b/resources/tests/userswitch.test.js
index 047e7a8..732c7b3 100644
--- a/resources/tests/userswitch.test.js
+++ b/resources/tests/userswitch.test.js
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import test from "node:test";
+import { test } from "vitest";
 
 var clickHandler = null;
 var reloads = 0;
diff --git a/stryker.config.mjs b/stryker.config.mjs
index 24d75bb..a069d2d 100644
--- a/stryker.config.mjs
+++ b/stryker.config.mjs
@@ -17,11 +17,10 @@ const config = {
         "resources/src/toolbar/position.js",
         "resources/src/toolbar/url.js",
     ],
-    testRunner: "command",
-    commandRunner: {
-        command: "node --test resources/tests/*.test.js",
+    testRunner: "vitest",
+    vitest: {
+        configFile: "vitest.config.js",
     },
-    coverageAnalysis: "off",
     concurrency: 4,
     reporters: ["clear-text", "progress", "html"],
     thresholds: {
diff --git a/vitest.config.js b/vitest.config.js
new file mode 100644
index 0000000..8837a37
--- /dev/null
+++ b/vitest.config.js
@@ -0,0 +1,26 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    coverage: {
+      provider: "v8",
+      include: ["resources/src/**/*.js"],
+      exclude: [
+        "resources/src/core/debug.js",
+        "resources/src/toolbar/element.js",
+        "resources/src/toolbar/index.js",
+      ],
+      reporter: ["text"],
+      reportsDirectory: "runtime/coverage-js",
+      thresholds: {
+        branches: 100,
+        functions: 100,
+        lines: 100,
+      },
+    },
+    environment: "node",
+    include: ["resources/tests/**/*.test.js"],
+    isolate: true,
+    pool: "threads",
+  },
+});