fix: add @vitest/coverage-v8 devDependency for coverage provider

vitest.config.mts specifies coverage.provider: 'v8' but the
@vitest/coverage-v8 package was missing from devDependencies.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package-lock.json

@@ -17,6 +17,7 @@
         "@testing-library/user-event": "^14.5.2",
         "@types/react": "^19.2.14",
         "@types/react-dom": "^19.2.3",
+        "@vitest/coverage-v8": "^3.2.4",
         "jsdom": "^24.0.0",
         "react": "^18.3.1",
         "react-dom": "^18.3.1",
@@ -37,6 +38,20 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@ampproject/remapping": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/@ampproject/remapping/-/remapping-2.3.0.tgz",
+      "integrity": "sha512-30iZtAPgz+LTIYoeivqYo853f02jBYSd5uGnGpkFV0M3xOt9aN73erkgYAmZU43x4VfqcnLxW9Kpg3R5LC4YYw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@jridgewell/gen-mapping": "^0.3.5",
+        "@jridgewell/trace-mapping": "^0.3.24"
+      },
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
     "node_modules/@apidevtools/json-schema-ref-parser": {
       "version": "11.7.2",
       "resolved": "https://registry.npmjs.org/@apidevtools/json-schema-ref-parser/-/json-schema-ref-parser-11.7.2.tgz",
@@ -431,6 +446,16 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@bcoe/v8-coverage": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-1.0.2.tgz",
+      "integrity": "sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@bundled-es-modules/cookie": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@bundled-es-modules/cookie/-/cookie-2.0.1.tgz",
@@ -4846,6 +4871,40 @@
         "vitest": "3.2.4"
       }
     },
+    "node_modules/@vitest/coverage-v8": {
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/@vitest/coverage-v8/-/coverage-v8-3.2.4.tgz",
+      "integrity": "sha512-EyF9SXU6kS5Ku/U82E259WSnvg6c8KTjppUncuNdm5QHpe17mwREHnjDzozC8x9MZ0xfBUFSaLkRv4TMA75ALQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@ampproject/remapping": "^2.3.0",
+        "@bcoe/v8-coverage": "^1.0.2",
+        "ast-v8-to-istanbul": "^0.3.3",
+        "debug": "^4.4.1",
+        "istanbul-lib-coverage": "^3.2.2",
+        "istanbul-lib-report": "^3.0.1",
+        "istanbul-lib-source-maps": "^5.0.6",
+        "istanbul-reports": "^3.1.7",
+        "magic-string": "^0.30.17",
+        "magicast": "^0.3.5",
+        "std-env": "^3.9.0",
+        "test-exclude": "^7.0.1",
+        "tinyrainbow": "^2.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@vitest/browser": "3.2.4",
+        "vitest": "3.2.4"
+      },
+      "peerDependenciesMeta": {
+        "@vitest/browser": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@vitest/expect": {
       "version": "3.2.4",
       "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-3.2.4.tgz",
@@ -5651,6 +5710,35 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/ast-v8-to-istanbul": {
+      "version": "0.3.12",
+      "resolved": "https://registry.npmjs.org/ast-v8-to-istanbul/-/ast-v8-to-istanbul-0.3.12.tgz",
+      "integrity": "sha512-BRRC8VRZY2R4Z4lFIL35MwNXmwVqBityvOIwETtsCSwvjl0IdgFsy9NhdaA6j74nUdtJJlIypeRhpDam19Wq3g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/trace-mapping": "^0.3.31",
+        "estree-walker": "^3.0.3",
+        "js-tokens": "^10.0.0"
+      }
+    },
+    "node_modules/ast-v8-to-istanbul/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/ast-v8-to-istanbul/node_modules/js-tokens": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-10.0.0.tgz",
+      "integrity": "sha512-lM/UBzQmfJRo9ABXbPWemivdCW8V2G8FHaHdypQaIy523snUjog0W71ayWXTjiR+ixeMyVHN2XcpnTd/liPg/Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/astral-regex": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-2.0.0.tgz",

package.json

@@ -43,6 +43,7 @@
     "@testing-library/user-event": "^14.5.2",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
+    "@vitest/coverage-v8": "^3.2.4",
     "jsdom": "^24.0.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",