diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 028a62f..8c25963 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -1,12 +1,13 @@
 {
   "name": "frontend",
-  "version": "0.0.0",
+  "version": "2026.9.26",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "frontend",
-      "version": "0.0.0",
+      "version": "2026.9.26",
+      "license": "AGPL-3.0-or-later",
       "dependencies": {
         "markdown-to-jsx": "^9.10.2",
         "react": "^19.2.8",
@@ -15,13 +16,16 @@
         "vite-plugin-pwa": "^1.3.0"
       },
       "devDependencies": {
+        "@testing-library/react": "^16.3.3",
         "@types/node": "^24.13.3",
         "@types/react": "^19.2.17",
         "@types/react-dom": "^19.2.3",
         "@vitejs/plugin-react": "^6.0.4",
+        "jsdom": "^30.1.1",
         "oxlint": "^1.75.0",
         "typescript": "~6.0.2",
         "vite": "^8.2.0",
+        "vitest": "^5.0.2",
         "workbox-cacheable-response": "^7.4.1",
         "workbox-expiration": "^7.4.1",
         "workbox-precaching": "^7.4.1",
@@ -45,6 +49,59 @@
         "ajv": ">=8"
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+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-7.1.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/css-calc": "^3.4.1",
+        "@csstools/css-color-parser": "^4.2.4",
+        "@csstools/css-parser-algorithms": "^4.0.1",
+        "@csstools/css-tokenizer": "^4.0.2",
+        "lru-cache": "^11.5.3"
+      },
+      "engines": {
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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-11.5.3.tgz",
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+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": "20 || >=22"
+      }
+    },
+    "node_modules/@asamuzakjp/dom-selector": {
+      "version": "9.2.2",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/dom-selector/-/dom-selector-9.2.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "bidi-js": "^1.1.0",
+        "css-tree": "^3.2.1",
+        "is-potential-custom-element-name": "^1.0.1",
+        "lru-cache": "^11.5.3"
+      },
+      "engines": {
+        "node": "^22.22.2 || ^24.15.0 || >=26.0.0"
+      }
+    },
+    "node_modules/@asamuzakjp/dom-selector/node_modules/lru-cache": {
+      "version": "11.5.3",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.5.3.tgz",
+      "integrity": "sha512-U4N8FgzmWxc8k1VH8Kr6lQg18U7Fjvby6wXHVRX/ZZ7IwWbRMgrRbP0Wrb5q5NVinryp4SQampHKdvtecItxUg==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "engines": {
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+      }
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     "node_modules/@babel/code-frame": {
       "version": "7.29.7",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.7.tgz",
@@ -1496,6 +1553,177 @@
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       }
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+    "node_modules/@bramus/specificity": {
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+      "resolved": "https://registry.npmjs.org/@bramus/specificity/-/specificity-2.4.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "css-tree": "^3.0.0"
+      },
+      "bin": {
+        "specificity": "bin/cli.js"
+      }
+    },
+    "node_modules/@csstools/color-helpers": {
+      "version": "6.1.2",
+      "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-6.1.2.tgz",
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+      "dev": true,
+      "funding": [
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+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
+        "node": ">=20.19.0"
+      }
+    },
+    "node_modules/@csstools/css-calc": {
+      "version": "3.4.1",
+      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-3.4.1.tgz",
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+      "dev": true,
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+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^4.0.1",
+        "@csstools/css-tokenizer": "^4.0.2"
+      }
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+    "node_modules/@csstools/css-color-parser": {
+      "version": "4.2.4",
+      "resolved": "https://registry.npmjs.org/@csstools/css-color-parser/-/css-color-parser-4.2.4.tgz",
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+      "dev": true,
+      "funding": [
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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",
+      "dependencies": {
+        "@csstools/color-helpers": "^6.1.2",
+        "@csstools/css-calc": "^3.4.1"
+      },
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
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+        "@csstools/css-tokenizer": "^4.0.2"
+      }
+    },
+    "node_modules/@csstools/css-parser-algorithms": {
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+      "resolved": "https://registry.npmjs.org/@csstools/css-parser-algorithms/-/css-parser-algorithms-4.0.1.tgz",
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+      "dev": true,
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+          "url": "https://github.com/sponsors/csstools"
+        },
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+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
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+      "peerDependencies": {
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+    },
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+      "resolved": "https://registry.npmjs.org/@csstools/css-syntax-patches-for-csstree/-/css-syntax-patches-for-csstree-1.1.14.tgz",
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+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
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+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "peerDependencies": {
+        "css-tree": "^3.2.1"
+      },
+      "peerDependenciesMeta": {
+        "css-tree": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@csstools/css-tokenizer": {
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+      "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-4.0.2.tgz",
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+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      }
+    },
+    "node_modules/@exodus/bytes": {
+      "version": "1.16.0",
+      "resolved": "https://registry.npmjs.org/@exodus/bytes/-/bytes-1.16.0.tgz",
+      "integrity": "sha512-IcpW84uEn3N7ETtNZMlxKhfl6Pec8rUNGOTBtWbK1FKhJxIFAptZyVrvVRVBimAJxJCgc3PxepxkdWWG4DVzfA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      },
+      "peerDependencies": {
+        "@noble/hashes": "^1.8.0 || ^2.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@noble/hashes": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@isaacs/cliui": {
       "version": "9.0.0",
       "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-9.0.0.tgz",
@@ -1545,9 +1773,9 @@
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-      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
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+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.6.0.tgz",
+      "integrity": "sha512-T7jf+5zgsZHwNJ4lvQ7/aezbyk0nNX+zJVWpmHA7VYsEx7a7qr5Rg5IbtJFqkgze5Y2sruq1RUY8Q837Od7iFw==",
       "license": "MIT"
     },
     "node_modules/@jridgewell/trace-mapping": {
@@ -2578,6 +2806,55 @@
         "win32"
       ]
     },
+    "node_modules/@testing-library/dom": {
+      "version": "10.4.2",
+      "resolved": "https://registry.npmjs.org/@testing-library/dom/-/dom-10.4.2.tgz",
+      "integrity": "sha512-yzr2S9HyAIdhz2/6qHgbs665Q7PKVcDF05vsOlHPxG1mo36gKVesdYVeDLnXgfjJ03CrKRk08knc6+E/9m8v2Q==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "dependencies": {
+        "@babel/code-frame": "^7.10.4",
+        "@babel/runtime": "^7.12.5",
+        "@types/aria-query": "^5.0.1",
+        "aria-query": "5.3.0",
+        "dom-accessibility-api": "^0.5.9",
+        "lz-string": "^1.5.0",
+        "picocolors": "1.1.1",
+        "pretty-format": "^27.0.2"
+      },
+      "engines": {
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+    },
+    "node_modules/@testing-library/react": {
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+      "resolved": "https://registry.npmjs.org/@testing-library/react/-/react-16.3.3.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/runtime": "^7.12.5"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@testing-library/dom": "^10.0.0",
+        "@types/react": "^18.0.0 || ^19.0.0",
+        "@types/react-dom": "^18.0.0 || ^19.0.0",
+        "react": "^18.0.0 || ^19.0.0",
+        "react-dom": "^18.0.0 || ^19.0.0"
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+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        },
+        "@types/react-dom": {
+          "optional": true
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@@ -2593,6 +2870,32 @@
         "node": ">=12"
       }
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+    "node_modules/@types/aria-query": {
+      "version": "5.0.4",
+      "resolved": "https://registry.npmjs.org/@types/aria-query/-/aria-query-5.0.4.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "peer": true
+    },
+    "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/estree": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.9.tgz",
@@ -2667,6 +2970,64 @@
         }
       }
     },
+    "node_modules/@vitest/mocker": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-5.0.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/trace-mapping": "0.3.31",
+        "@vitest/spy": "5.0.2",
+        "estree-walker": "^3.0.3",
+        "magic-string": "^1.2.3"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "msw": "^2.4.9",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
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+        "msw": {
+          "optional": true
+        },
+        "vite": {
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+        }
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+    },
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+      "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-3.0.3.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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+    "node_modules/@vitest/spy": {
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+      "resolved": "https://registry.npmjs.org/@vitest/spy/-/spy-5.0.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "funding": {
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@@ -2695,6 +3056,42 @@
         "url": "https://github.com/sponsors/epoberezkin"
       }
     },
+    "node_modules/ansi-regex": {
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+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "engines": {
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+    "node_modules/ansi-styles": {
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+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
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+      }
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+      "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-5.3.0.tgz",
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+      "license": "Apache-2.0",
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@@ -2732,6 +3129,16 @@
         "url": "https://github.com/sponsors/ljharb"
       }
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+    "node_modules/assertion-error": {
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       "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.27.0.tgz",
@@ -5413,6 +6101,13 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/std-env": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/std-env/-/std-env-4.2.0.tgz",
+      "integrity": "sha512-oCUKSupKTHX53EyjDtuZQ64pjLJ6yYCtpmEw0goYxtjG9KpbRe8KAsl2tBUGU9DyMcJ0RwJ8GqJAFzMXcXW1Rw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/stop-iteration-iterator": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/stop-iteration-iterator/-/stop-iteration-iterator-1.1.0.tgz",
@@ -5590,6 +6285,26 @@
         "node": ">=10"
       }
     },
+    "node_modules/tinybench": {
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-6.2.0.tgz",
+      "integrity": "sha512-78U2TlB2CnVenajOFzf3BKSm0J6oz5L0NV7g32LCPccvYc0lbWvys4d3uUUCS2B1N8PAf2+aekR8i1KbC3HO7Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.0.0"
+      }
+    },
+    "node_modules/tinyexec": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.3.1.tgz",
+      "integrity": "sha512-GCvB3aoys96IuDFBMcTB46JOR6mdMtAToqwiW8JlWhsoh1mhHi/xn9ss/Dg7N555GiJyEt2qzoG/NHCwM6h1EA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/tinyglobby": {
       "version": "0.2.17",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.17.tgz",
@@ -5606,6 +6321,52 @@
         "url": "https://github.com/sponsors/SuperchupuDev"
       }
     },
+    "node_modules/tldts": {
+      "version": "7.4.16",
+      "resolved": "https://registry.npmjs.org/tldts/-/tldts-7.4.16.tgz",
+      "integrity": "sha512-QwBER5KMR86IIjpIiO7H/Z3IMJPsZ1A6RKPAqzTTgOyUQUSt9FdnKcqhTaJmkY6HVrgouZHZR0ncK5QxvmnQeg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tldts-core": "^7.4.16"
+      },
+      "bin": {
+        "tldts": "bin/cli.js"
+      }
+    },
+    "node_modules/tldts-core": {
+      "version": "7.4.16",
+      "resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-7.4.16.tgz",
+      "integrity": "sha512-MDolfaSJtlSK5Y0A1xl3277ekubZwobpBjugknDizI9O5Rm60a1m8k4ICK+MRsCDzPygT81mp3BBf5RKDlFRfA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tough-cookie": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-6.0.2.tgz",
+      "integrity": "sha512-exgYmnmL/sJpR3upZfXG5PoatXQii55xAiXGXzY+sROLZ/Y+SLcp9PgJNI9Vz37HpQ74WvDcLT8eqm+kV3FzrA==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "tldts": "^7.0.5"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
+    "node_modules/tr46": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-6.0.0.tgz",
+      "integrity": "sha512-bLVMLPtstlZ4iMQHpFHTR7GAGj2jxi8Dg0s2h2MafAE4uSWF98FC/3MomU51iQAMf8/qDUbKWf5GxuvvVcXEhw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "punycode": "^2.3.1"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/type-fest": {
       "version": "0.16.0",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.16.0.tgz",
@@ -5724,6 +6485,16 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/undici": {
+      "version": "8.11.2",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-8.11.2.tgz",
+      "integrity": "sha512-u4UB2/IrKdU6lFxumHmmo1a3fCQO5tzQllRorfoRS63txhrB7xTpSn1PftwC4qEHkOaqP95fCWW4lJzwErwzhQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=22.19.0"
+      }
+    },
     "node_modules/undici-types": {
       "version": "7.18.2",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.18.2.tgz",
@@ -5939,6 +6710,147 @@
         }
       }
     },
+    "node_modules/vitest": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-5.0.2.tgz",
+      "integrity": "sha512-7MQrx9pDv5aHiUcovIb/70Ys3tgtkUVgCtledvKdCmEO+/1Dicq5ZqoSxOW034m03oqC+oHOKui2dM6qtMLoJg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/chai": "^5.2.2",
+        "@vitest/mocker": "5.0.2",
+        "chai": "^6.2.2",
+        "es-module-lexer": "^2.3.2",
+        "expect-type": "^1.4.0",
+        "magic-string": "^1.2.3",
+        "obug": "^2.1.4",
+        "picomatch": "^4.0.7",
+        "std-env": "^4.2.0",
+        "tinybench": "^6.1.4",
+        "tinyexec": "^1.3.0",
+        "tinyglobby": "^0.2.17",
+        "why-is-node-running": "^3.2.1"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^22.12.0 || ^24.0.0 || >=26.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "5.0.2",
+        "@vitest/browser-preview": "5.0.2",
+        "@vitest/browser-webdriverio": "^5.0.0-beta.5 || >=5.0.0",
+        "@vitest/coverage-istanbul": "5.0.2",
+        "@vitest/coverage-v8": "5.0.2",
+        "@vitest/ui": "5.0.2",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "vite": "^6.4.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
+    "node_modules/vitest/node_modules/magic-string": {
+      "version": "1.4.2",
+      "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-1.4.2.tgz",
+      "integrity": "sha512-vG+rjFRj1PqdIBozIxAGMjPlOhaVe+GXpbttY/iSK7rGcJRMlwNJO7dcUwmUqkymsFLJiNGI06t4D7Fr7yRC9g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/sourcemap-codec": "^1.6.0"
+      }
+    },
+    "node_modules/w3c-xmlserializer": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-6.0.0.tgz",
+      "integrity": "sha512-4Nsy8K5Tr6SPDH9jhKJOHf7ChDrc1zufZTVSF7x72hwuEXBqxqk9G6cK+K2NRUtB3iELRJqjXb4JPDMBjMTl2Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": "^22.22.2 || ^24.15.0 || >=26.0.0"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-8.0.1.tgz",
+      "integrity": "sha512-BMhLD/Sw+GbJC21C/UgyaZX41nPt8bUTg+jWyDeg7e7YN4xOM05YPSIXceACnXVtqyEw/LMClUQMtMZ+PGGpqQ==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/whatwg-mimetype": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-5.0.0.tgz",
+      "integrity": "sha512-sXcNcHOC51uPGF0P/D4NVtrkjSU2fNsm9iog4ZvZJsL3rjoDAzXZhkm2MWt1y+PUdggKAYVoMAIYcs78wJ51Cw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "17.1.2",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-17.1.2.tgz",
+      "integrity": "sha512-TEZA+Zqxin7Jjsm2cjRohCmen5awh+hT6Zi3VZdqZlNRk7zvOI/9WpBFg/DWlA56bWnzwm6DuB8NS0EsxQH9uQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@exodus/bytes": "^1.15.1",
+        "tr46": "^6.0.0",
+        "webidl-conversions": "^8.0.1"
+      },
+      "engines": {
+        "node": "^22.14.0 || >=24.0.0"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -6039,6 +6951,19 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-3.2.2.tgz",
+      "integrity": "sha512-NKUzAelcoCXhXL4dJzKIwXeR8iEVqsA0Lq6Vnd0UXvgaKbzVo4ZTHROF2Jidrv+SgxOQ03fMinnNhzZATxOD3A==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=20.11"
+      }
+    },
     "node_modules/workbox-background-sync": {
       "version": "7.4.1",
       "resolved": "https://registry.npmjs.org/workbox-background-sync/-/workbox-background-sync-7.4.1.tgz",
@@ -6242,6 +7167,23 @@
         "workbox-core": "7.4.1"
       }
     },
+    "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/frontend/package.json b/frontend/package.json
index ba8b05d..6e07714 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -8,7 +8,8 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "lint": "oxlint",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "vitest run"
   },
   "dependencies": {
     "markdown-to-jsx": "^9.10.2",
@@ -18,13 +19,16 @@
     "vite-plugin-pwa": "^1.3.0"
   },
   "devDependencies": {
+    "@testing-library/react": "^16.3.3",
     "@types/node": "^24.13.3",
     "@types/react": "^19.2.17",
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^6.0.4",
+    "jsdom": "^30.1.1",
     "oxlint": "^1.75.0",
     "typescript": "~6.0.2",
     "vite": "^8.2.0",
+    "vitest": "^5.0.2",
     "workbox-cacheable-response": "^7.4.1",
     "workbox-expiration": "^7.4.1",
     "workbox-precaching": "^7.4.1",
diff --git a/frontend/src/hooks/useDesktopRoomBridge.test.ts b/frontend/src/hooks/useDesktopRoomBridge.test.ts
new file mode 100644
index 0000000..f5d3211
--- /dev/null
+++ b/frontend/src/hooks/useDesktopRoomBridge.test.ts
@@ -0,0 +1,68 @@
+import { renderHook } from '@testing-library/react'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import * as desktopBridge from '../lib/desktopBridge'
+import { useDesktopRoomBridge } from './useDesktopRoomBridge'
+
+describe('useDesktopRoomBridge', () => {
+  beforeEach(() => {
+    vi.spyOn(desktopBridge, 'notifyRoomOpened')
+    vi.spyOn(desktopBridge, 'notifyUnreadCount')
+  })
+
+  afterEach(() => {
+    vi.restoreAllMocks()
+  })
+
+  it('calls roomOpened once when entering a room', () => {
+    renderHook(({ roomId, count }) => useDesktopRoomBridge(roomId, count), {
+      initialProps: { roomId: 'room-1', count: 0 },
+    })
+    expect(desktopBridge.notifyRoomOpened).toHaveBeenCalledTimes(1)
+  })
+
+  it('does not call roomOpened again on a rerender with the same roomId', () => {
+    const { rerender } = renderHook(({ roomId, count }) => useDesktopRoomBridge(roomId, count), {
+      initialProps: { roomId: 'room-1', count: 0 },
+    })
+    expect(desktopBridge.notifyRoomOpened).toHaveBeenCalledTimes(1)
+
+    // Unrelated rerender -- unreadRoomCount changed, roomId did not.
+    rerender({ roomId: 'room-1', count: 3 })
+    rerender({ roomId: 'room-1', count: 3 })
+    expect(desktopBridge.notifyRoomOpened).toHaveBeenCalledTimes(1)
+  })
+
+  it('calls roomOpened again on a genuine transition to a different room', () => {
+    const { rerender } = renderHook(({ roomId, count }) => useDesktopRoomBridge(roomId, count), {
+      initialProps: { roomId: 'room-1', count: 0 },
+    })
+    rerender({ roomId: 'room-2', count: 0 })
+    expect(desktopBridge.notifyRoomOpened).toHaveBeenCalledTimes(2)
+  })
+
+  it('does not call roomOpened when there is no room id', () => {
+    renderHook(({ roomId, count }) => useDesktopRoomBridge(roomId, count), {
+      initialProps: { roomId: undefined as string | undefined, count: 0 },
+    })
+    expect(desktopBridge.notifyRoomOpened).not.toHaveBeenCalled()
+  })
+
+  it('sends the unread count whenever it changes, independent of roomOpened', () => {
+    const { rerender } = renderHook(({ roomId, count }) => useDesktopRoomBridge(roomId, count), {
+      initialProps: { roomId: undefined as string | undefined, count: 0 },
+    })
+    expect(desktopBridge.notifyUnreadCount).toHaveBeenCalledWith(0)
+
+    rerender({ roomId: undefined, count: 2 })
+    expect(desktopBridge.notifyUnreadCount).toHaveBeenCalledWith(2)
+    expect(desktopBridge.notifyRoomOpened).not.toHaveBeenCalled()
+  })
+})
+
+describe('desktop bridge functions with no window.dsDesktop', () => {
+  it('remain optional -- calling them does not throw when the bridge is absent', () => {
+    expect(window.dsDesktop).toBeUndefined()
+    expect(() => desktopBridge.notifyRoomOpened()).not.toThrow()
+    expect(() => desktopBridge.notifyUnreadCount(5)).not.toThrow()
+  })
+})
diff --git a/frontend/src/hooks/useDesktopRoomBridge.ts b/frontend/src/hooks/useDesktopRoomBridge.ts
new file mode 100644
index 0000000..c9f10d0
--- /dev/null
+++ b/frontend/src/hooks/useDesktopRoomBridge.ts
@@ -0,0 +1,26 @@
+import { useEffect } from 'react'
+import { notifyRoomOpened, notifyUnreadCount } from '../lib/desktopBridge'
+
+// Tells the Electron desktop wrapper (a) when the user has genuinely
+// entered a room, so it can clear that room's tray indicator, and (b) the
+// current unread-room count, so the tray badge stays accurate. Both are
+// no-ops in every browser build (see desktopBridge.ts).
+//
+// roomOpened must fire only on a genuine transition to a real room id --
+// never merely because the window was shown, focused, restored, or opened
+// from the tray, and never when no room is open at all. Depending on just
+// the id (a primitive, not the room object) is what makes this safe to
+// call from a component that rerenders often: an unrelated rerender that
+// leaves activeRoomId unchanged doesn't rerun the effect, so there's no
+// separate de-duplication to get wrong here -- it falls out of React's own
+// effect-dependency comparison.
+export function useDesktopRoomBridge(activeRoomId: string | undefined, unreadRoomCount: number): void {
+  useEffect(() => {
+    if (!activeRoomId) return
+    notifyRoomOpened()
+  }, [activeRoomId])
+
+  useEffect(() => {
+    notifyUnreadCount(unreadRoomCount)
+  }, [unreadRoomCount])
+}
diff --git a/frontend/src/lib/desktopBridge.ts b/frontend/src/lib/desktopBridge.ts
index 4593601..449552e 100644
--- a/frontend/src/lib/desktopBridge.ts
+++ b/frontend/src/lib/desktopBridge.ts
@@ -15,6 +15,12 @@ declare global {
   interface Window {
     dsDesktop?: {
       setUnreadCount?(unreadRoomCount: number): void
+      // Tells the tray/dock icon the user has genuinely entered a room --
+      // the desktop wrapper's own signal to clear that room's tray
+      // indicator. Deliberately not fired just because the window was
+      // shown/focused/restored, or opened from the tray: none of those mean
+      // the user actually looked at the room the unread message is in.
+      roomOpened?(): void
       showNotification?(notification: DesktopNotificationRequest): void
       onNotificationClick?(callback: (roomId: string) => void): () => void
     }
@@ -38,6 +44,16 @@ export function isDesktopClickListenerSupported(): boolean {
   return typeof window.dsDesktop?.onNotificationClick === 'function'
 }
 
+// Both no-op silently if the bridge or this specific method isn't present,
+// same as showDesktopNotification below -- callers never need to guard.
+export function notifyRoomOpened(): void {
+  window.dsDesktop?.roomOpened?.()
+}
+
+export function notifyUnreadCount(unreadRoomCount: number): void {
+  window.dsDesktop?.setUnreadCount?.(unreadRoomCount)
+}
+
 // No-ops silently if the bridge or this specific method isn't present --
 // callers don't need to guard, matching the rest of this module's
 // capability-detect-per-method philosophy (see #49's "feature-test each
diff --git a/frontend/src/lib/roomIndicators.test.ts b/frontend/src/lib/roomIndicators.test.ts
new file mode 100644
index 0000000..cb6089b
--- /dev/null
+++ b/frontend/src/lib/roomIndicators.test.ts
@@ -0,0 +1,56 @@
+import { describe, expect, it } from 'vitest'
+import type { MyRoomItem } from '../types'
+import { clearRoomIndicators } from './roomIndicators'
+
+function makeRoom(overrides: Partial<MyRoomItem> & { id: string }): MyRoomItem {
+  return {
+    name: overrides.id,
+    description: null,
+    is_private: false,
+    is_dm: false,
+    is_archived: false,
+    owner_id: 'owner',
+    created_at: '2026-01-01T00:00:00Z',
+    role: 'member',
+    has_unread: false,
+    has_mention: false,
+    dm_partner: null,
+    email_notifications: false,
+    ...overrides,
+  }
+}
+
+describe('clearRoomIndicators', () => {
+  it('clears has_unread and has_mention on the matching room', () => {
+    const rooms = [makeRoom({ id: 'room-1', has_unread: true, has_mention: true })]
+    const result = clearRoomIndicators(rooms, 'room-1')
+    expect(result[0].has_unread).toBe(false)
+    expect(result[0].has_mention).toBe(false)
+  })
+
+  it('preserves unread state on every other room', () => {
+    const rooms = [
+      makeRoom({ id: 'room-1', has_unread: true, has_mention: true }),
+      makeRoom({ id: 'room-2', has_unread: true, has_mention: false }),
+      makeRoom({ id: 'room-3', has_unread: false, has_mention: false }),
+    ]
+    const result = clearRoomIndicators(rooms, 'room-1')
+    const room2 = result.find((r) => r.id === 'room-2')
+    const room3 = result.find((r) => r.id === 'room-3')
+    expect(room2?.has_unread).toBe(true)
+    expect(room3?.has_unread).toBe(false)
+  })
+
+  it('leaves untouched rooms as the same object reference', () => {
+    const room2 = makeRoom({ id: 'room-2', has_unread: true })
+    const rooms = [makeRoom({ id: 'room-1', has_unread: true }), room2]
+    const result = clearRoomIndicators(rooms, 'room-1')
+    expect(result[1]).toBe(room2)
+  })
+
+  it('is a no-op if the room id is not found', () => {
+    const rooms = [makeRoom({ id: 'room-1', has_unread: true })]
+    const result = clearRoomIndicators(rooms, 'does-not-exist')
+    expect(result[0].has_unread).toBe(true)
+  })
+})
diff --git a/frontend/src/lib/roomIndicators.ts b/frontend/src/lib/roomIndicators.ts
new file mode 100644
index 0000000..ce1e2c0
--- /dev/null
+++ b/frontend/src/lib/roomIndicators.ts
@@ -0,0 +1,9 @@
+import type { MyRoomItem } from '../types'
+
+// Pulled out of ChatShellPage as a pure function purely so it's directly
+// unit-testable without rendering the whole page -- behavior is unchanged.
+// Only touches the matching room; every other room's object reference (and
+// therefore its unread state) is left untouched.
+export function clearRoomIndicators(rooms: MyRoomItem[], roomId: string): MyRoomItem[] {
+  return rooms.map((r) => (r.id === roomId ? { ...r, has_unread: false, has_mention: false } : r))
+}
diff --git a/frontend/src/pages/ChatShellPage.tsx b/frontend/src/pages/ChatShellPage.tsx
index 5bf4aa3..f7beeac 100644
--- a/frontend/src/pages/ChatShellPage.tsx
+++ b/frontend/src/pages/ChatShellPage.tsx
@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useState } from 'react'
+import { useCallback, useEffect, useMemo, useState } from 'react'
 import { useNavigate, useParams } from 'react-router-dom'
 import { NetworkError } from '../api/client'
 import { listMyRooms, listRoomMembers } from '../api/rooms'
@@ -12,7 +12,9 @@ import { Sidebar } from '../components/Sidebar'
 import { TopBar } from '../components/TopBar'
 import { useAuth } from '../context/AuthContext'
 import { useChatSocketContext } from '../context/ChatSocketContext'
+import { useDesktopRoomBridge } from '../hooks/useDesktopRoomBridge'
 import { MOBILE_BREAKPOINT, useWindowWidth } from '../hooks/useWindowWidth'
+import { clearRoomIndicators } from '../lib/roomIndicators'
 import type { MyRoomItem, RoomMember } from '../types'
 import './ChatShellPage.css'
 
@@ -60,10 +62,13 @@ export function ChatShellPage() {
 
   const socket = useChatSocketContext()
 
-  const clearRoomIndicators = useCallback((id: string) => {
-    setRooms((prev) => prev.map((r) => (r.id === id ? { ...r, has_unread: false, has_mention: false } : r)))
+  const handleRoomRead = useCallback((id: string) => {
+    setRooms((prev) => clearRoomIndicators(prev, id))
   }, [])
 
+  const unreadRoomCount = useMemo(() => rooms.filter((r) => r.has_unread).length, [rooms])
+  useDesktopRoomBridge(activeRoom?.id, unreadRoomCount)
+
   useEffect(
     () =>
       socket.subscribe((envelope) => {
@@ -134,7 +139,7 @@ export function ChatShellPage() {
               onToggleInfo={() => setInfoOpen((v) => !v)}
               infoOpen={infoOpen}
               socket={socket}
-              onRoomRead={clearRoomIndicators}
+              onRoomRead={handleRoomRead}
             />
           ) : (
             !isMobile && (
diff --git a/frontend/vitest.config.ts b/frontend/vitest.config.ts
new file mode 100644
index 0000000..701fe8b
--- /dev/null
+++ b/frontend/vitest.config.ts
@@ -0,0 +1,13 @@
+import { defineConfig } from 'vitest/config'
+import react from '@vitejs/plugin-react'
+
+// Deliberately separate from vite.config.ts, not an extension of it -- that
+// file's VitePWA plugin does real build-time work (service worker
+// injection, manifest generation) that has nothing to do with running unit
+// tests and would just slow every test run down for no benefit.
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    environment: 'jsdom',
+  },
+})