diff --git a/client/package-lock.json b/client/package-lock.json
index bca8463c0..7bea223fb 100644
--- a/client/package-lock.json
+++ b/client/package-lock.json
@@ -57,13 +57,161 @@
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 				"eslint-plugin-react-hooks": "^5.0.0",
 				"eslint-plugin-react-refresh": "^0.4.6",
+				"jsdom": "^29.1.1",
 				"lint-staged": "^16.2.7",
 				"mongoose": "9.6.2",
 				"prettier": "^3.3.3",
 				"typescript": "5.9.3",
-				"vite": "^6.4.2"
+				"vite": "^6.4.2",
+				"vitest": "^3.2.7"
 			}
 		},
+		"node_modules/@asamuzakjp/css-color": {
+			"version": "5.1.11",
+			"resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-5.1.11.tgz",
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+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@asamuzakjp/generational-cache": "^1.0.1",
+				"@csstools/css-calc": "^3.2.0",
+				"@csstools/css-color-parser": "^4.1.0",
+				"@csstools/css-parser-algorithms": "^4.0.0",
+				"@csstools/css-tokenizer": "^4.0.0"
+			},
+			"engines": {
+				"node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+			}
+		},
+		"node_modules/@asamuzakjp/css-color/node_modules/@csstools/css-calc": {
+			"version": "3.3.0",
+			"resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-3.3.0.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"
+			},
+			"peerDependencies": {
+				"@csstools/css-parser-algorithms": "^4.0.0",
+				"@csstools/css-tokenizer": "^4.0.0"
+			}
+		},
+		"node_modules/@asamuzakjp/css-color/node_modules/@csstools/css-color-parser": {
+			"version": "4.2.0",
+			"resolved": "https://registry.npmjs.org/@csstools/css-color-parser/-/css-color-parser-4.2.0.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",
+			"dependencies": {
+				"@csstools/color-helpers": "^6.1.1",
+				"@csstools/css-calc": "^3.3.0"
+			},
+			"engines": {
+				"node": ">=20.19.0"
+			},
+			"peerDependencies": {
+				"@csstools/css-parser-algorithms": "^4.0.0",
+				"@csstools/css-tokenizer": "^4.0.0"
+			}
+		},
+		"node_modules/@asamuzakjp/css-color/node_modules/@csstools/css-parser-algorithms": {
+			"version": "4.0.0",
+			"resolved": "https://registry.npmjs.org/@csstools/css-parser-algorithms/-/css-parser-algorithms-4.0.0.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": {
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+			},
+			"peerDependencies": {
+				"@csstools/css-tokenizer": "^4.0.0"
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+		},
+		"node_modules/@asamuzakjp/css-color/node_modules/@csstools/css-tokenizer": {
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+			"resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-4.0.0.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": {
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+			}
+		},
+		"node_modules/@asamuzakjp/dom-selector": {
+			"version": "7.1.1",
+			"resolved": "https://registry.npmjs.org/@asamuzakjp/dom-selector/-/dom-selector-7.1.1.tgz",
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+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@asamuzakjp/generational-cache": "^1.0.1",
+				"@asamuzakjp/nwsapi": "^2.3.9",
+				"bidi-js": "^1.0.3",
+				"css-tree": "^3.2.1",
+				"is-potential-custom-element-name": "^1.0.1"
+			},
+			"engines": {
+				"node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+			}
+		},
+		"node_modules/@asamuzakjp/generational-cache": {
+			"version": "1.0.1",
+			"resolved": "https://registry.npmjs.org/@asamuzakjp/generational-cache/-/generational-cache-1.0.1.tgz",
+			"integrity": "sha512-wajfB8KqzMCN2KGNFdLkReeHncd0AslUSrvHVvvYWuU8ghncRJoA50kT3zP9MVL0+9g4/67H+cdvBskj9THPzg==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+			}
+		},
+		"node_modules/@asamuzakjp/nwsapi": {
+			"version": "2.3.9",
+			"resolved": "https://registry.npmjs.org/@asamuzakjp/nwsapi/-/nwsapi-2.3.9.tgz",
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+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/@babel/code-frame": {
 			"version": "7.29.7",
 			"resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.7.tgz",
@@ -335,6 +483,64 @@
 				"node": ">=6.9.0"
 			}
 		},
+		"node_modules/@bramus/specificity": {
+			"version": "2.4.2",
+			"resolved": "https://registry.npmjs.org/@bramus/specificity/-/specificity-2.4.2.tgz",
+			"integrity": "sha512-ctxtJ/eA+t+6q2++vj5j7FYX3nRu311q1wfYH3xjlLOsczhlhxAg2FWNUXhpGvAw3BWo1xBcvOV6/YLc2r5FJw==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"css-tree": "^3.0.0"
+			},
+			"bin": {
+				"specificity": "bin/cli.js"
+			}
+		},
+		"node_modules/@csstools/color-helpers": {
+			"version": "6.1.1",
+			"resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-6.1.1.tgz",
+			"integrity": "sha512-gLNsunvwf3mCi5u5o46/Z/JcJMnhbHSaZ69rkgPzNM3J4s8hWwpPUQB6/tt0EDFyCiWzxANlx+2LJwpYj4zS1w==",
+			"dev": true,
+			"funding": [
+				{
+					"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-syntax-patches-for-csstree": {
+			"version": "1.1.8",
+			"resolved": "https://registry.npmjs.org/@csstools/css-syntax-patches-for-csstree/-/css-syntax-patches-for-csstree-1.1.8.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-0",
+			"peerDependencies": {
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+			},
+			"peerDependenciesMeta": {
+				"css-tree": {
+					"optional": true
+				}
+			}
+		},
 		"node_modules/@csstools/css-tokenizer": {
 			"version": "3.0.4",
 			"resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-3.0.4.tgz",
@@ -950,6 +1156,24 @@
 				"node": "^12.22.0 || ^14.17.0 || >=16.0.0"
 			}
 		},
+		"node_modules/@exodus/bytes": {
+			"version": "1.15.1",
+			"resolved": "https://registry.npmjs.org/@exodus/bytes/-/bytes-1.15.1.tgz",
+			"integrity": "sha512-S6mL0yNB/Abt9Ei4tq8gDhcczc4S3+vQ4ra7vxnAf+YHC02srtqxKKZghx2Dq6p0e66THKwR6r8N6P95wEty7Q==",
+			"dev": true,
+			"license": "MIT",
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+			},
+			"peerDependencies": {
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+				"@noble/hashes": {
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+		},
 		"node_modules/@hapi/hoek": {
 			"version": "9.3.0",
 			"license": "BSD-3-Clause"
@@ -2297,6 +2521,17 @@
 				"@babel/types": "^7.28.2"
 			}
 		},
+		"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"
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+		},
 		"node_modules/@types/d3-array": {
 			"version": "3.2.2",
 			"license": "MIT"
@@ -2346,6 +2581,13 @@
 			"version": "3.0.2",
 			"license": "MIT"
 		},
+		"node_modules/@types/deep-eql": {
+			"version": "4.0.2",
+			"resolved": "https://registry.npmjs.org/@types/deep-eql/-/deep-eql-4.0.2.tgz",
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+			"dev": true,
+			"license": "MIT"
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 		"node_modules/@types/estree": {
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 			"resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.9.tgz",
@@ -2752,6 +2994,131 @@
 				"vite": "^4.2.0 || ^5.0.0 || ^6.0.0 || ^7.0.0"
 			}
 		},
+		"node_modules/@vitest/expect": {
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+			"resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-3.2.7.tgz",
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+			"license": "MIT",
+			"dependencies": {
+				"@types/chai": "^5.2.2",
+				"@vitest/spy": "3.2.7",
+				"@vitest/utils": "3.2.7",
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+				"tinyrainbow": "^2.0.0"
+			},
+			"funding": {
+				"url": "https://opencollective.com/vitest"
+			}
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+		"node_modules/@vitest/mocker": {
+			"version": "3.2.7",
+			"resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-3.2.7.tgz",
+			"integrity": "sha512-Trr0hYO9CM3Wj6ksWHRhK9IZpIY6wTMO5u/MqXurMxT57sWBaOPEtP3Oq60ihZuh5JsiagKfz95OcxdEP6dBrA==",
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+			"license": "MIT",
+			"dependencies": {
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+			"funding": {
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+				"vite": {
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+			"dependencies": {
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 		"node_modules/acorn": {
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@@ -2985,6 +3352,16 @@
 				"url": "https://github.com/sponsors/ljharb"
 			}
 		},
+		"node_modules/assertion-error": {
+			"version": "2.0.1",
+			"resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-2.0.1.tgz",
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+			"dev": true,
+			"license": "MIT",
+			"engines": {
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@@ -3069,6 +3446,16 @@
 				"node": ">=6.0.0"
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 		},
+		"node_modules/bidi-js": {
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+			"license": "MIT",
+			"dependencies": {
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 		"node_modules/brace-expansion": {
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@@ -3155,6 +3542,16 @@
 				"typewise-core": "^1.2"
 			}
 		},
+		"node_modules/cac": {
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+			"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",
 			"license": "MIT",
@@ -7004,6 +7727,13 @@
 			"dev": true,
 			"license": "MIT"
 		},
+		"node_modules/siginfo": {
+			"version": "2.0.0",
+			"resolved": "https://registry.npmjs.org/siginfo/-/siginfo-2.0.0.tgz",
+			"integrity": "sha512-ybx0WO1/8bSBLEWXZvEd7gMW3Sn3JFlW3TvX1nREbDLRNQNaeNN8WK0meBwPdAaOI7TtRRRJn/Es1zhrrCHu7g==",
+			"dev": true,
+			"license": "ISC"
+		},
 		"node_modules/signal-exit": {
 			"version": "4.1.0",
 			"resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-4.1.0.tgz",
@@ -7161,6 +7891,20 @@
 				"node": ">=0.10.0"
 			}
 		},
+		"node_modules/stackback": {
+			"version": "0.0.2",
+			"resolved": "https://registry.npmjs.org/stackback/-/stackback-0.0.2.tgz",
+			"integrity": "sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw==",
+			"dev": true,
+			"license": "MIT"
+		},
+		"node_modules/std-env": {
+			"version": "3.10.0",
+			"resolved": "https://registry.npmjs.org/std-env/-/std-env-3.10.0.tgz",
+			"integrity": "sha512-5GS12FdOZNliM5mAOxFRg7Ir0pWz8MdpYm6AY6VPkGpbA7ZzmbzNcBJQ0GPvvyWgcY7QAhCgf9Uy89I03faLkg==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/stop-iteration-iterator": {
 			"version": "1.1.0",
 			"dev": true,
@@ -7339,6 +8083,26 @@
 				"url": "https://github.com/sponsors/sindresorhus"
 			}
 		},
+		"node_modules/strip-literal": {
+			"version": "3.1.0",
+			"resolved": "https://registry.npmjs.org/strip-literal/-/strip-literal-3.1.0.tgz",
+			"integrity": "sha512-8r3mkIM/2+PpjHoOtiAW8Rg3jJLHaV7xPwG+YRGrv6FP0wwk/toTpATxWYOW0BKdWwl82VT2tFYi5DlROa0Mxg==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"js-tokens": "^9.0.1"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/antfu"
+			}
+		},
+		"node_modules/strip-literal/node_modules/js-tokens": {
+			"version": "9.0.1",
+			"resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-9.0.1.tgz",
+			"integrity": "sha512-mxa9E9ITFOt0ban3j6L5MpjwegGz6lBQmM1IJkWeBZGcMxto50+eWdjC/52xDbS2vy0k7vIMK0Fe2wfL9OQSpQ==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/stylis": {
 			"version": "4.2.0",
 			"license": "MIT"
@@ -7388,6 +8152,13 @@
 				"react": "^16.11.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
 			}
 		},
+		"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/text-segmentation": {
 			"version": "1.0.3",
 			"license": "MIT",
@@ -7404,6 +8175,20 @@
 			"version": "1.3.3",
 			"license": "MIT"
 		},
+		"node_modules/tinybench": {
+			"version": "2.9.0",
+			"resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
+			"integrity": "sha512-0+DUvqWMValLmha6lr4kD8iAMK1HzV0/aKnCtWb9v9641TnP/MFb7Pc2bxoxQjTXAErryXVgUOfv2YqNllqGeg==",
+			"dev": true,
+			"license": "MIT"
+		},
+		"node_modules/tinyexec": {
+			"version": "0.3.2",
+			"resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-0.3.2.tgz",
+			"integrity": "sha512-KQQR9yN7R5+OSwaK0XQoj22pwHoTlgYqmUscPYoknOoWCWfj/5/ABTMRi69FrKU5ffPVh5QcFikpWJI/P1ocHA==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/tinyglobby": {
 			"version": "0.2.15",
 			"license": "MIT",
@@ -7418,12 +8203,62 @@
 				"url": "https://github.com/sponsors/SuperchupuDev"
 			}
 		},
+		"node_modules/tinypool": {
+			"version": "1.1.1",
+			"resolved": "https://registry.npmjs.org/tinypool/-/tinypool-1.1.1.tgz",
+			"integrity": "sha512-Zba82s87IFq9A9XmjiX5uZA/ARWDrB03OHlq+Vw1fSdt0I+4/Kutwy8BP4Y/y/aORMo61FQ0vIb5j44vSo5Pkg==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": "^18.0.0 || >=20.0.0"
+			}
+		},
 		"node_modules/tinyqueue": {
 			"version": "3.0.0",
 			"resolved": "https://registry.npmjs.org/tinyqueue/-/tinyqueue-3.0.0.tgz",
 			"integrity": "sha512-gRa9gwYU3ECmQYv3lslts5hxuIa90veaEcxDYuu3QGOIAEM2mOZkVHp48ANJuu1CURtRdHKUBY5Lm1tHV+sD4g==",
 			"license": "ISC"
 		},
+		"node_modules/tinyrainbow": {
+			"version": "2.0.0",
+			"resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-2.0.0.tgz",
+			"integrity": "sha512-op4nsTR47R6p0vMUUoYl/a+ljLFVtlfaXkLQmqfLR1qHma1h/ysYk4hEXZ880bf2CYgTskvTa/e196Vd5dDQXw==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=14.0.0"
+			}
+		},
+		"node_modules/tinyspy": {
+			"version": "4.0.4",
+			"resolved": "https://registry.npmjs.org/tinyspy/-/tinyspy-4.0.4.tgz",
+			"integrity": "sha512-azl+t0z7pw/z958Gy9svOTuzqIk6xq+NSheJzn5MMWtWTFywIacg2wUlzKFGtt3cthx0r2SxMK0yzJOR0IES7Q==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=14.0.0"
+			}
+		},
+		"node_modules/tldts": {
+			"version": "7.4.10",
+			"resolved": "https://registry.npmjs.org/tldts/-/tldts-7.4.10.tgz",
+			"integrity": "sha512-GgouD1B+sWwvkaEq8vXC15DjQitxbvs12oIXELpconwm+Tg3zfcEv4jgzq3vtKverDXsg3VI8aRgNL2Nra0Iog==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"tldts-core": "^7.4.10"
+			},
+			"bin": {
+				"tldts": "bin/cli.js"
+			}
+		},
+		"node_modules/tldts-core": {
+			"version": "7.4.10",
+			"resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-7.4.10.tgz",
+			"integrity": "sha512-KnQjp53ZekKgm/r3l+u8kJGGzYgrWdP8+Mql7a4vijh2WE0IrZWspQj/TpTxDho/YxO+AnOZnIjQcCD+q6iJsw==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/to-regex-range": {
 			"version": "5.0.1",
 			"resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -7437,6 +8272,19 @@
 				"node": ">=8.0"
 			}
 		},
+		"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": "5.1.1",
 			"resolved": "https://registry.npmjs.org/tr46/-/tr46-5.1.1.tgz",
@@ -7603,6 +8451,16 @@
 				"url": "https://github.com/sponsors/ljharb"
 			}
 		},
+		"node_modules/undici": {
+			"version": "7.29.0",
+			"resolved": "https://registry.npmjs.org/undici/-/undici-7.29.0.tgz",
+			"integrity": "sha512-IDxfleLmmbSskfWSUATiN1nfn2rDuvnMOqb5CWR92iIfojA0Ud+ulOAAEQ57LPr9rWmsreUyf5lwyao+7GNNVw==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=20.18.1"
+			}
+		},
 		"node_modules/undici-types": {
 			"version": "7.12.0",
 			"devOptional": true,
@@ -7769,6 +8627,29 @@
 				}
 			}
 		},
+		"node_modules/vite-node": {
+			"version": "3.2.4",
+			"resolved": "https://registry.npmjs.org/vite-node/-/vite-node-3.2.4.tgz",
+			"integrity": "sha512-EbKSKh+bh1E1IFxeO0pg1n4dvoOTt0UDiXMd/qn++r98+jPO1xtJilvXldeuQ8giIB5IkpjCgMleHMNEsGH6pg==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"cac": "^6.7.14",
+				"debug": "^4.4.1",
+				"es-module-lexer": "^1.7.0",
+				"pathe": "^2.0.3",
+				"vite": "^5.0.0 || ^6.0.0 || ^7.0.0-0"
+			},
+			"bin": {
+				"vite-node": "vite-node.mjs"
+			},
+			"engines": {
+				"node": "^18.0.0 || ^20.0.0 || >=22.0.0"
+			},
+			"funding": {
+				"url": "https://opencollective.com/vitest"
+			}
+		},
 		"node_modules/vite-plugin-svgr": {
 			"version": "4.5.0",
 			"license": "MIT",
@@ -7781,6 +8662,79 @@
 				"vite": ">=2.6.0"
 			}
 		},
+		"node_modules/vitest": {
+			"version": "3.2.7",
+			"resolved": "https://registry.npmjs.org/vitest/-/vitest-3.2.7.tgz",
+			"integrity": "sha512-KrxIJ62Fd89gfysR4WotlgZABiz2dqFPgqGzX7s+CwsqLFomRH7777ZcrOD6+WVAh7khPQP41A+BKbpcJFrdEg==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@types/chai": "^5.2.2",
+				"@vitest/expect": "3.2.7",
+				"@vitest/mocker": "3.2.7",
+				"@vitest/pretty-format": "^3.2.7",
+				"@vitest/runner": "3.2.7",
+				"@vitest/snapshot": "3.2.7",
+				"@vitest/spy": "3.2.7",
+				"@vitest/utils": "3.2.7",
+				"chai": "^5.2.0",
+				"debug": "^4.4.1",
+				"expect-type": "^1.2.1",
+				"magic-string": "^0.30.17",
+				"pathe": "^2.0.3",
+				"picomatch": "^4.0.2",
+				"std-env": "^3.9.0",
+				"tinybench": "^2.9.0",
+				"tinyexec": "^0.3.2",
+				"tinyglobby": "^0.2.14",
+				"tinypool": "^1.1.1",
+				"tinyrainbow": "^2.0.0",
+				"vite": "^5.0.0 || ^6.0.0 || ^7.0.0-0",
+				"vite-node": "3.2.4",
+				"why-is-node-running": "^2.3.0"
+			},
+			"bin": {
+				"vitest": "vitest.mjs"
+			},
+			"engines": {
+				"node": "^18.0.0 || ^20.0.0 || >=22.0.0"
+			},
+			"funding": {
+				"url": "https://opencollective.com/vitest"
+			},
+			"peerDependencies": {
+				"@edge-runtime/vm": "*",
+				"@types/debug": "^4.1.12",
+				"@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
+				"@vitest/browser": "3.2.7",
+				"@vitest/ui": "3.2.7",
+				"happy-dom": "*",
+				"jsdom": "*"
+			},
+			"peerDependenciesMeta": {
+				"@edge-runtime/vm": {
+					"optional": true
+				},
+				"@types/debug": {
+					"optional": true
+				},
+				"@types/node": {
+					"optional": true
+				},
+				"@vitest/browser": {
+					"optional": true
+				},
+				"@vitest/ui": {
+					"optional": true
+				},
+				"happy-dom": {
+					"optional": true
+				},
+				"jsdom": {
+					"optional": true
+				}
+			}
+		},
 		"node_modules/void-elements": {
 			"version": "3.1.0",
 			"license": "MIT",
@@ -7788,6 +8742,19 @@
 				"node": ">=0.10.0"
 			}
 		},
+		"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",
@@ -7798,6 +8765,16 @@
 				"node": ">=12"
 			}
 		},
+		"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": "14.2.0",
 			"resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-14.2.0.tgz",
@@ -7907,6 +8884,23 @@
 				"url": "https://github.com/sponsors/ljharb"
 			}
 		},
+		"node_modules/why-is-node-running": {
+			"version": "2.3.0",
+			"resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+			"integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"siginfo": "^2.0.0",
+				"stackback": "0.0.2"
+			},
+			"bin": {
+				"why-is-node-running": "cli.js"
+			},
+			"engines": {
+				"node": ">=8"
+			}
+		},
 		"node_modules/word-wrap": {
 			"version": "1.2.5",
 			"dev": true,
@@ -7998,6 +8992,23 @@
 			"dev": true,
 			"license": "ISC"
 		},
+		"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/client/package.json b/client/package.json
index ee290cae8..ac70f6834 100644
--- a/client/package.json
+++ b/client/package.json
@@ -11,7 +11,9 @@
 		"lint-strict": "eslint . --ext js,jsx,ts,tsx --report-unused-disable-directives --max-warnings 0",
 		"preview": "vite preview",
 		"format": "prettier --write .",
-		"format-check": "prettier --check ."
+		"format-check": "prettier --check .",
+		"test": "vitest run",
+		"test:watch": "vitest"
 	},
 	"lint-staged": {
 		"**/*": "prettier --write --ignore-unknown"
@@ -66,10 +68,12 @@
 		"eslint-plugin-react": "^7.34.1",
 		"eslint-plugin-react-hooks": "^5.0.0",
 		"eslint-plugin-react-refresh": "^0.4.6",
+		"jsdom": "^29.1.1",
 		"lint-staged": "^16.2.7",
 		"mongoose": "9.6.2",
 		"prettier": "^3.3.3",
 		"typescript": "5.9.3",
-		"vite": "^6.4.2"
+		"vite": "^6.4.2",
+		"vitest": "^3.2.7"
 	}
 }
diff --git a/client/src/Utils/logger.test.ts b/client/src/Utils/logger.test.ts
new file mode 100644
index 000000000..da7c0d7fa
--- /dev/null
+++ b/client/src/Utils/logger.test.ts
@@ -0,0 +1,201 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+/**
+ * Regression tests for the credential leak reported in #3843: a failed request
+ * wrote the full body — including the plaintext password — to the console.
+ *
+ * These drive the exported `logger` rather than the private redaction helpers,
+ * so they cover the wiring too. The original fix redacted the JSON branch but
+ * left the debug branch printing the raw objects, which these tests catch.
+ *
+ * `configuredLevel` is captured at module load, so each level needs a fresh
+ * import with `runtimeConfig` mocked beforehand.
+ */
+
+const PASSWORD = "correct-horse-battery-staple";
+const BEARER = "eyJhbGciOiJIUzI1NiJ9.super-secret-jwt";
+
+type ConsoleMethod = "log" | "warn" | "error";
+const spies: Partial<Record<ConsoleMethod, ReturnType<typeof vi.spyOn>>> = {};
+
+/** Everything written to the console during a test, as one searchable string. */
+const consoleOutput = (): string =>
+	(["log", "warn", "error"] as const)
+		.flatMap((method) => spies[method]?.mock.calls ?? [])
+		.map((args) => args.map((arg) => JSON.stringify(arg) ?? String(arg)).join(" "))
+		.join("\n");
+
+const loadLogger = async (level: "debug" | "error") => {
+	vi.resetModules();
+	vi.doMock("@/Utils/runtimeConfig", () => ({ runtimeConfig: { logLevel: level } }));
+	return (await import("@/Utils/logger")).logger;
+};
+
+beforeEach(() => {
+	for (const method of ["log", "warn", "error"] as const) {
+		spies[method] = vi.spyOn(console, method).mockImplementation(() => {});
+	}
+	vi.spyOn(console, "group").mockImplementation(() => {});
+	vi.spyOn(console, "groupEnd").mockImplementation(() => {});
+});
+
+afterEach(() => {
+	vi.restoreAllMocks();
+	vi.doUnmock("@/Utils/runtimeConfig");
+});
+
+describe.each(["error", "debug"] as const)("logger at level %s", (level) => {
+	it("does not log a password from a failed request body", async () => {
+		const logger = await loadLogger(level);
+
+		logger.error("POST request failed", new Error("Request failed"), {
+			endpoint: "/auth/login",
+			body: { email: "user@example.com", password: PASSWORD },
+		});
+
+		expect(consoleOutput()).not.toContain(PASSWORD);
+		expect(consoleOutput()).toContain("[REDACTED]");
+	});
+
+	it("keeps non-sensitive context so logs stay useful", async () => {
+		const logger = await loadLogger(level);
+
+		logger.error("POST request failed", new Error("boom"), {
+			endpoint: "/auth/login",
+			body: { email: "user@example.com", password: PASSWORD },
+		});
+
+		const output = consoleOutput();
+		expect(output).toContain("/auth/login");
+		expect(output).toContain("user@example.com");
+	});
+
+	it("does not leak credentials carried on an AxiosError", async () => {
+		const logger = await loadLogger(level);
+
+		// Axios attaches the outgoing request to the error: `config.data` holds the
+		// serialized body and `config.headers` the Authorization set in ApiClient.
+		const axiosError = Object.assign(new Error("Request failed with status code 502"), {
+			name: "AxiosError",
+			config: {
+				url: "/auth/login",
+				method: "post",
+				data: JSON.stringify({ email: "user@example.com", password: PASSWORD }),
+				headers: { Authorization: `Bearer ${BEARER}`, Accept: "application/json" },
+			},
+			response: { status: 502 },
+		});
+
+		logger.error("POST request failed", axiosError, { endpoint: "/auth/login" });
+
+		const output = consoleOutput();
+		expect(output).not.toContain(PASSWORD);
+		expect(output).not.toContain(BEARER);
+	});
+
+	it("redacts a password held on a class instance, not just an object literal", async () => {
+		const logger = await loadLogger(level);
+
+		// Declared without parameter properties: the repo enables
+		// `erasableSyntaxOnly`, which disallows that shorthand.
+		class LoginPayload {
+			email: string;
+			password: string;
+
+			constructor(email: string, password: string) {
+				this.email = email;
+				this.password = password;
+			}
+		}
+
+		logger.error("POST request failed", new Error("boom"), {
+			endpoint: "/auth/login",
+			body: new LoginPayload("user@example.com", PASSWORD),
+		});
+
+		expect(consoleOutput()).not.toContain(PASSWORD);
+	});
+
+	it("redacts a request body that is not JSON rather than logging it raw", async () => {
+		const logger = await loadLogger(level);
+
+		const formEncoded = Object.assign(new Error("boom"), {
+			config: {
+				url: "/auth/login",
+				method: "post",
+				data: `email=user@example.com&password=${PASSWORD}`,
+				headers: {},
+			},
+		});
+
+		logger.error("POST request failed", formEncoded, {});
+
+		expect(consoleOutput()).not.toContain(PASSWORD);
+	});
+
+	it("redacts secrets passed through warn", async () => {
+		const logger = await loadLogger(level);
+
+		logger.warn("monitor update failed", {
+			endpoint: "/monitors/1",
+			body: { url: "https://example.com", secret: BEARER },
+		});
+
+		expect(consoleOutput()).not.toContain(BEARER);
+	});
+});
+
+describe("logger at level debug", () => {
+	// debug() and info() are suppressed at error level, so they only apply here.
+	it("redacts secrets passed through debug and info", async () => {
+		const logger = await loadLogger("debug");
+
+		logger.debug("payload", { password: PASSWORD });
+		logger.info("payload", { apiKey: BEARER });
+
+		const output = consoleOutput();
+		expect(output).not.toContain(PASSWORD);
+		expect(output).not.toContain(BEARER);
+	});
+});
+
+describe("redaction key matching", () => {
+	it.each([
+		["password", { password: PASSWORD }],
+		["newPassword", { newPassword: PASSWORD }],
+		["confirmPassword", { confirmPassword: PASSWORD }],
+		["secret", { secret: PASSWORD }],
+		["accessToken", { accessToken: PASSWORD }],
+		["X-Api-Key", { "X-Api-Key": PASSWORD }],
+		["Authorization", { Authorization: PASSWORD }],
+		["private_key", { private_key: PASSWORD }],
+	])("redacts %s", async (_name, body) => {
+		const logger = await loadLogger("error");
+
+		logger.error("POST request failed", undefined, { body });
+
+		expect(consoleOutput()).not.toContain(PASSWORD);
+	});
+
+	it("survives a circular payload without hanging", async () => {
+		const logger = await loadLogger("error");
+
+		const circular: Record<string, unknown> = { password: PASSWORD };
+		circular.self = circular;
+
+		expect(() =>
+			logger.error("POST request failed", undefined, { body: circular })
+		).not.toThrow();
+		expect(consoleOutput()).not.toContain(PASSWORD);
+	});
+
+	it("renders a repeated sibling in full rather than marking it circular", async () => {
+		const logger = await loadLogger("error");
+
+		const shared = { monitorId: "abc123" };
+
+		logger.error("POST request failed", undefined, { first: shared, second: shared });
+
+		expect(consoleOutput()).not.toContain("[CIRCULAR]");
+	});
+});
diff --git a/client/vitest.config.ts b/client/vitest.config.ts
new file mode 100644
index 000000000..75ca75aa3
--- /dev/null
+++ b/client/vitest.config.ts
@@ -0,0 +1,18 @@
+import { defineConfig } from "vitest/config";
+import path from "path";
+import { fileURLToPath } from "url";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+export default defineConfig({
+	resolve: {
+		alias: {
+			"@": path.resolve(__dirname, "./src"),
+		},
+	},
+	test: {
+		// The logger reads window.location and navigator.userAgent.
+		environment: "jsdom",
+		include: ["src/**/*.{test,spec}.{ts,tsx}"],
+	},
+});