diff --git a/package-lock.json b/package-lock.json
index e11e9d5..70401f8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,14 +13,25 @@
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         "ffmpeg-static": "^5.3.0",
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         "vite": "^5.4.14",
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@@ -35,6 +46,27 @@
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+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-3.2.0.tgz",
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+      "dev": true,
+      "license": "MIT",
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+        "@csstools/css-color-parser": "^3.0.9",
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+    "node_modules/@asamuzakjp/css-color/node_modules/lru-cache": {
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+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-10.4.3.tgz",
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@@ -269,6 +301,16 @@
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+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.29.2.tgz",
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@@ -324,6 +366,121 @@
       "dev": true,
       "license": "MIT"
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+      "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-5.1.0.tgz",
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+      "license": "MIT-0",
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+      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-2.1.4.tgz",
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+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
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+          "url": "https://opencollective.com/csstools"
+        }
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+      "license": "MIT",
+      "engines": {
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+      "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-3.0.4.tgz",
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+      "dev": true,
+      "funding": [
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+          "url": "https://github.com/sponsors/csstools"
+        },
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+      "license": "MIT",
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@@ -1177,6 +1334,104 @@
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+        "react-dom": "^18.0.0 || ^19.0.0"
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+        "@types/react-dom": {
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+      "license": "MIT",
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+        "npm": ">=6"
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@@ -1435,6 +1690,16 @@
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@@ -1445,6 +1710,13 @@
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@@ -1645,6 +1944,48 @@
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@@ -1673,6 +2021,49 @@
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+      "version": "2.2.23",
+      "resolved": "https://registry.npmjs.org/nwsapi/-/nwsapi-2.2.23.tgz",
+      "integrity": "sha512-7wfH4sLbt4M0gCDzGE6vzQBo0bfTKjU7Sfpqy/7gs1qBfYz2vEJH6vXcBKpO3+6Yu1telwd0t9HpyOoLEQQbIQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/package-json-from-dist": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/package-json-from-dist/-/package-json-from-dist-1.0.1.tgz",
@@ -2229,6 +2996,19 @@
       "integrity": "sha512-60zvsJReQPX5/QP0Kzfd/VrpjScIQ7SHBW6bFCYfEP+fp0Eppr1SHhIO5nd1PjZtvclzSzES9D/p5nFJurwfWg==",
       "dev": true
     },
+    "node_modules/parse5": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.3.0.tgz",
+      "integrity": "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "entities": "^6.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
     "node_modules/path-key": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/path-key/-/path-key-3.1.1.tgz",
@@ -2363,6 +3143,47 @@
         "node": "^10 || ^12 || >=14"
       }
     },
+    "node_modules/pretty-format": {
+      "version": "27.5.1",
+      "resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-27.5.1.tgz",
+      "integrity": "sha512-Qb1gy5OrP5+zDf2Bvnzdl3jsTf1qXVMazbvCoKhtKqVs4/YK4ozX4gKQJJVyNe+cajNPn0KoC0MC3FUmaHWEmQ==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "dependencies": {
+        "ansi-regex": "^5.0.1",
+        "ansi-styles": "^5.0.0",
+        "react-is": "^17.0.1"
+      },
+      "engines": {
+        "node": "^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"
+      }
+    },
+    "node_modules/pretty-format/node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/pretty-format/node_modules/ansi-styles": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
+      "integrity": "sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
     "node_modules/progress": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/progress/-/progress-2.0.3.tgz",
@@ -2373,6 +3194,16 @@
         "node": ">=0.4.0"
       }
     },
+    "node_modules/punycode": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
+      "integrity": "sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/react": {
       "version": "18.3.1",
       "resolved": "https://registry.npmjs.org/react/-/react-18.3.1.tgz",
@@ -2398,6 +3229,14 @@
         "react": "^18.3.1"
       }
     },
+    "node_modules/react-is": {
+      "version": "17.0.2",
+      "resolved": "https://registry.npmjs.org/react-is/-/react-is-17.0.2.tgz",
+      "integrity": "sha512-w2GsyukL62IJnlaff/nRegPQR94C/XXamvMWmSHRJ4y7Ts/4ocGRmTHvOs8PSE6pB3dWOrD/nueuU5sduBsQ4w==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true
+    },
     "node_modules/react-refresh": {
       "version": "0.17.0",
       "resolved": "https://registry.npmjs.org/react-refresh/-/react-refresh-0.17.0.tgz",
@@ -2423,6 +3262,20 @@
         "node": ">= 6"
       }
     },
+    "node_modules/redent": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/redent/-/redent-3.0.0.tgz",
+      "integrity": "sha512-6tDA8g98We0zd0GvVeMT9arEOnTw9qM03L9cJXaCjrip1OO764RDBLBfrB4cwzNGDj5OA5ioymC9GkizgWJDUg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "indent-string": "^4.0.0",
+        "strip-indent": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/rollup": {
       "version": "4.60.3",
       "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.60.3.tgz",
@@ -2468,6 +3321,13 @@
         "fsevents": "~2.3.2"
       }
     },
+    "node_modules/rrweb-cssom": {
+      "version": "0.7.1",
+      "resolved": "https://registry.npmjs.org/rrweb-cssom/-/rrweb-cssom-0.7.1.tgz",
+      "integrity": "sha512-TrEMa7JGdVm0UThDJSx7ddw5nVm3UJS9o9CCIZ72B1vSyEZoziDqBYP3XIoi/12lKrJR8rE3jeFHMok2F/Mnsg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/safe-buffer": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
@@ -2489,6 +3349,26 @@
       ],
       "license": "MIT"
     },
+    "node_modules/safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/saxes": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/saxes/-/saxes-6.0.0.tgz",
+      "integrity": "sha512-xAg7SOnEhrm5zI3puOOKyy1OMcMlIJZYNJY7xLBwSze0UjhPLnWfj2GF2EpT0jmzaJKIWKHLsaSSajf35bcYnA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "xmlchars": "^2.2.0"
+      },
+      "engines": {
+        "node": ">=v12.22.7"
+      }
+    },
     "node_modules/scheduler": {
       "version": "0.23.2",
       "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.23.2.tgz",
@@ -2689,6 +3569,19 @@
         "node": ">=8"
       }
     },
+    "node_modules/strip-indent": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-3.0.0.tgz",
+      "integrity": "sha512-laJTa3Jb+VQpaC6DseHhF7dXVqHTfJPCRDaEbid/drOhgitgYku/letMUqOXFoWV0zIIUbjpdH2t+tYj4bQMRQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "min-indent": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/supports-color": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
@@ -2702,6 +3595,13 @@
         "node": ">=8"
       }
     },
+    "node_modules/symbol-tree": {
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
+      "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/test-exclude": {
       "version": "7.0.2",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-7.0.2.tgz",
@@ -2761,6 +3661,52 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/tldts": {
+      "version": "6.1.86",
+      "resolved": "https://registry.npmjs.org/tldts/-/tldts-6.1.86.tgz",
+      "integrity": "sha512-WMi/OQ2axVTf/ykqCQgXiIct+mSQDFdH2fkwhPwgEwvJ1kSzZRiinb0zF2Xb8u4+OqPChmyI6MEu4EezNJz+FQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tldts-core": "^6.1.86"
+      },
+      "bin": {
+        "tldts": "bin/cli.js"
+      }
+    },
+    "node_modules/tldts-core": {
+      "version": "6.1.86",
+      "resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-6.1.86.tgz",
+      "integrity": "sha512-Je6p7pkk+KMzMv2XXKmAE3McmolOQFdxkKw0R8EYNr7sELW46JqnNeTX8ybPiQgvg1ymCoF8LXs5fzFaZvJPTA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tough-cookie": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-5.1.2.tgz",
+      "integrity": "sha512-FVDYdxtnj0G6Qm/DhNPSb8Ju59ULcup3tuJxkFb5K8Bv2pUXILbf0xZWU8PX8Ov19OXljbUyveOFwRMwkXzO+A==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "tldts": "^6.1.32"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
+    "node_modules/tr46": {
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-5.1.1.tgz",
+      "integrity": "sha512-hdF5ZgjTqgAntKkklYw0R03MG2x/bSzTtkxmIRw/sTNV8YXsCJ1tfLAX23lhxhHJlEf3CRCOCGGWw3vI3GaSPw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "punycode": "^2.3.1"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
@@ -2955,6 +3901,67 @@
         }
       }
     },
+    "node_modules/w3c-xmlserializer": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
+      "integrity": "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
+      "integrity": "sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/whatwg-encoding": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-3.1.1.tgz",
+      "integrity": "sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==",
+      "deprecated": "Use @exodus/bytes instead for a more spec-conformant and faster implementation",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "iconv-lite": "0.6.3"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/whatwg-mimetype": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-4.0.0.tgz",
+      "integrity": "sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "14.2.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-14.2.0.tgz",
+      "integrity": "sha512-De72GdQZzNTUBBChsXueQUnPKDkg/5A5zp7pFDuQAj5UFoENpiACU0wlCvzpAGnTkj++ihpKwKyYewn/XNUbKw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tr46": "^5.1.0",
+        "webidl-conversions": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -3086,6 +4093,45 @@
         "node": ">=8"
       }
     },
+    "node_modules/ws": {
+      "version": "8.20.1",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.20.1.tgz",
+      "integrity": "sha512-It4dO0K5v//JtTXuPkfEOaI3uUN87iYPnqo/ZzqCoG3g8uhA66QUMs/SrM0YK7/NAu+r4LMh/9dq2A7k+rHs+w==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
diff --git a/package.json b/package.json
index dcb9d70..e97a12e 100644
--- a/package.json
+++ b/package.json
@@ -17,9 +17,13 @@
     "react-dom": "^18.3.1"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.2",
+    "@testing-library/user-event": "^14.6.1",
     "@vitejs/plugin-react": "^4.3.4",
     "@vitest/coverage-v8": "^2.1.9",
     "ffmpeg-static": "^5.3.0",
+    "jsdom": "^25.0.1",
     "playwright": "^1.59.1",
     "vite": "^5.4.14",
     "vitest": "^2.1.9"
diff --git a/src/app.dom.test.jsx b/src/app.dom.test.jsx
new file mode 100644
index 0000000..4b68396
--- /dev/null
+++ b/src/app.dom.test.jsx
@@ -0,0 +1,79 @@
+// Component smoke tests for the App — narrow safety net against the class of
+// bug exemplified by PR #3's C2 scope error (`roleNotes` defined in `App` but
+// consumed in `Result` would throw `ReferenceError` at runtime despite green
+// unit tests and a green build).
+//
+// These tests render the full React tree and exercise navigation. They are
+// NOT a substitute for end-to-end testing of each verdict path — they are a
+// tripwire for runtime errors, missing imports, and scope mistakes that
+// pure-function unit tests cannot catch.
+//
+// Tested in jsdom via vitest's environmentMatchGlobs override (see
+// vitest.config.js). The full Result-screen walk-through is intentionally
+// deferred to a future Playwright E2E pass — getting to step 7 in jsdom
+// with the current UI requires more selector engineering than the safety
+// net warrants.
+
+import { describe, it, expect, beforeEach } from 'vitest';
+import { render, screen, cleanup } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import App from '../ai-act-compass.jsx';
+
+describe('App smoke — runtime safety', () => {
+  beforeEach(() => cleanup());
+
+  it('mounts the welcome screen without throwing', () => {
+    render(<App />);
+    expect(screen.getByRole('main')).toBeInTheDocument();
+    // The "Start qualification" CTA must be present and clickable.
+    expect(screen.getByRole('button', { name: /start qualification/i })).toBeEnabled();
+  });
+
+  it('navigates Welcome → Step 1 when Start is clicked', async () => {
+    const user = userEvent.setup();
+    render(<App />);
+
+    await user.click(screen.getByRole('button', { name: /start qualification/i }));
+
+    // Step 1 renders the role question. "Continue" is the Next CTA.
+    const continueBtn = screen.getByRole('button', { name: /^continue$/i });
+    expect(continueBtn).toBeInTheDocument();
+    // canNext is false until a role is picked → button is disabled.
+    expect(continueBtn).toBeDisabled();
+  });
+
+  it('enables Continue after picking a role on Step 1', async () => {
+    const user = userEvent.setup();
+    render(<App />);
+
+    await user.click(screen.getByRole('button', { name: /start qualification/i }));
+
+    // Click the "Provider" role card. The role IDs are French ('fournisseur')
+    // but the displayed label is "Provider" in EN.
+    const providerLabel = screen.getByText(/^Provider$/);
+    const providerCard = providerLabel.closest('button, [role="button"]') || providerLabel.parentElement;
+    await user.click(providerCard);
+
+    // After picking the role, Continue becomes enabled.
+    const continueBtn = screen.getByRole('button', { name: /^continue$/i });
+    expect(continueBtn).toBeEnabled();
+  });
+
+  it('shows the deployerKind sub-question only when role === "deployeur"', async () => {
+    const user = userEvent.setup();
+    render(<App />);
+
+    await user.click(screen.getByRole('button', { name: /start qualification/i }));
+
+    // Before any role selection, the deployer-kind subhead is not in the DOM.
+    expect(screen.queryByText(/deployer kind/i)).not.toBeInTheDocument();
+
+    // Pick "Deployer".
+    const deployerLabel = screen.getByText(/^Deployer$/);
+    const deployerCard = deployerLabel.closest('button, [role="button"]') || deployerLabel.parentElement;
+    await user.click(deployerCard);
+
+    // The deployer-kind sub-question header now appears.
+    expect(screen.getByText(/deployer kind/i)).toBeInTheDocument();
+  });
+});
diff --git a/src/test-setup.js b/src/test-setup.js
new file mode 100644
index 0000000..48d2fe6
--- /dev/null
+++ b/src/test-setup.js
@@ -0,0 +1,10 @@
+// Global test setup — extends Vitest's `expect` with jest-dom matchers
+// (toBeInTheDocument, toHaveTextContent, etc.) for any test running in jsdom.
+// No-op for tests in the default node environment.
+import '@testing-library/jest-dom/vitest';
+
+// jsdom doesn't implement window.scrollTo — the App calls it on step change,
+// producing noisy stderr. Stub it out so tests get clean output.
+if (typeof window !== 'undefined') {
+  window.scrollTo = () => {};
+}
diff --git a/vitest.config.js b/vitest.config.js
index 1880b7b..3b7209f 100644
--- a/vitest.config.js
+++ b/vitest.config.js
@@ -1,9 +1,17 @@
 import { defineConfig } from 'vitest/config';
+import react from '@vitejs/plugin-react';
 
 export default defineConfig({
+  plugins: [react()],
   test: {
     environment: 'node',
-    include: ['src/**/*.test.js'],
+    include: ['src/**/*.test.js', 'src/**/*.test.jsx'],
+    // Per-file environment override: *.dom.test.jsx files run in jsdom for
+    // component testing; everything else stays in fast node env.
+    environmentMatchGlobs: [
+      ['src/**/*.dom.test.jsx', 'jsdom'],
+    ],
+    setupFiles: ['./src/test-setup.js'],
     coverage: {
       provider: 'v8',
       reporter: ['text', 'html'],