diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 5d0c3bb..22eab2e 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -71,5 +71,8 @@ jobs:
       - name: Dependencies installieren
         run: npm install
 
+      - name: Unit-Tests (Vitest)
+        run: npm run test
+
       - name: Typecheck + Build
         run: npm run build
diff --git a/.gitignore b/.gitignore
index 634b2db..0aa1947 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 *~
 screenshots/
 subagents-sammlung/
+CLAUDE.md
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 2280eaf..878adcf 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -23,15 +23,27 @@
       "devDependencies": {
         "@playwright/test": "^1.47.2",
         "@tailwindcss/vite": "^4.3.3",
+        "@testing-library/jest-dom": "^6.9.1",
+        "@testing-library/react": "^16.3.3",
+        "@testing-library/user-event": "^14.6.7",
         "@types/react": "^18.3.3",
         "@types/react-dom": "^18.3.0",
         "@vitejs/plugin-react": "^4.3.1",
+        "jsdom": "^25.0.1",
         "tailwindcss": "^4.3.3",
         "typescript": "^5.5.4",
         "vite": "^5.4.6",
-        "vite-plugin-pwa": "^0.20.5"
+        "vite-plugin-pwa": "^0.20.5",
+        "vitest": "^2.1.9"
       }
     },
+    "node_modules/@adobe/css-tools": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/@adobe/css-tools/-/css-tools-4.5.0.tgz",
+      "integrity": "sha512-6OzddxPio9UiWTCemp4N8cYLV2ZN1ncRnV1cVGtve7dhPOtRkleRyx32GQCYSwDYgaHU3USMm84tNsvKzRCa1Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@apideck/better-ajv-errors": {
       "version": "0.3.7",
       "resolved": "https://registry.npmjs.org/@apideck/better-ajv-errors/-/better-ajv-errors-0.3.7.tgz",
@@ -49,6 +61,27 @@
         "ajv": ">=8"
       }
     },
+    "node_modules/@asamuzakjp/css-color": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-3.2.0.tgz",
+      "integrity": "sha512-K1A6z8tS3XsmCMM86xoWdn7Fkdn9m6RSVtocUrJYIwZnFVkng/PvkEoWtOWmP+Scc6saYWHWZYbndEEXxl24jw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/css-calc": "^2.1.3",
+        "@csstools/css-color-parser": "^3.0.9",
+        "@csstools/css-parser-algorithms": "^3.0.4",
+        "@csstools/css-tokenizer": "^3.0.3",
+        "lru-cache": "^10.4.3"
+      }
+    },
+    "node_modules/@asamuzakjp/css-color/node_modules/lru-cache": {
+      "version": "10.4.3",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-10.4.3.tgz",
+      "integrity": "sha512-JNAzZcXrCt42VGLuYz0zfAzDfAvJWW6AfYlDBQyDV5DClI2m5sAmK+OIO7s59XfsRsWHp02jAJrRadPRGTt6SQ==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/@babel/code-frame": {
       "version": "7.29.7",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.7.tgz",
@@ -1623,6 +1656,121 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@csstools/color-helpers": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-5.1.0.tgz",
+      "integrity": "sha512-S11EXWJyy0Mz5SYvRmY8nJYTFFd1LCNV+7cXyAgQtOOuzb4EsgfqDufL+9esx72/eLhsRdGZwaldu/h+E4t4BA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@csstools/css-calc": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-2.1.4.tgz",
+      "integrity": "sha512-3N8oaj+0juUw/1H3YwmDDJXCgTB1gKU6Hc/bB502u9zR0q2vd786XJH9QfrKIEgFlZmhZiq6epXl4rHqhzsIgQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^3.0.5",
+        "@csstools/css-tokenizer": "^3.0.4"
+      }
+    },
+    "node_modules/@csstools/css-color-parser": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-color-parser/-/css-color-parser-3.1.0.tgz",
+      "integrity": "sha512-nbtKwh3a6xNVIp/VRuXV64yTKnb1IjTAEEh3irzS+HkKjAOYLTGNb9pmVNntZ8iVBHcWDA2Dof0QtPgFI1BaTA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/color-helpers": "^5.1.0",
+        "@csstools/css-calc": "^2.1.4"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^3.0.5",
+        "@csstools/css-tokenizer": "^3.0.4"
+      }
+    },
+    "node_modules/@csstools/css-parser-algorithms": {
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/@csstools/css-parser-algorithms/-/css-parser-algorithms-3.0.5.tgz",
+      "integrity": "sha512-DaDeUkXZKjdGhgYaHNJTV9pV7Y9B3b644jCLs9Upc3VeNGg6LWARAT6O+Q+/COo+2gg/bM5rhpMAtf70WqfBdQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@csstools/css-tokenizer": "^3.0.4"
+      }
+    },
+    "node_modules/@csstools/css-tokenizer": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-3.0.4.tgz",
+      "integrity": "sha512-Vd/9EVDiu6PPJt9yAh6roZP6El1xHrdvIVGjyBsHR0RYwNHgL7FJPyIIW4fANJNG6FtyZfvlRPpFI4ZM/lubvw==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@esbuild/aix-ppc64": {
       "version": "0.21.5",
       "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.21.5.tgz",
@@ -2909,6 +3057,96 @@
         "vite": "^5.2.0 || ^6 || ^7 || ^8"
       }
     },
+    "node_modules/@testing-library/dom": {
+      "version": "10.4.1",
+      "resolved": "https://registry.npmjs.org/@testing-library/dom/-/dom-10.4.1.tgz",
+      "integrity": "sha512-o4PXJQidqJl82ckFaXUeoAW+XysPLauYI43Abki5hABd853iMhitooc6znOnczgbTYmEP6U6/y1ZyKAIsvMKGg==",
+      "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": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@testing-library/jest-dom": {
+      "version": "6.9.1",
+      "resolved": "https://registry.npmjs.org/@testing-library/jest-dom/-/jest-dom-6.9.1.tgz",
+      "integrity": "sha512-zIcONa+hVtVSSep9UT3jZ5rizo2BsxgyDYU7WFD5eICBE7no3881HGeb/QkGfsJs6JTkY1aQhT7rIPC7e+0nnA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@adobe/css-tools": "^4.4.0",
+        "aria-query": "^5.0.0",
+        "css.escape": "^1.5.1",
+        "dom-accessibility-api": "^0.6.3",
+        "picocolors": "^1.1.1",
+        "redent": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=14",
+        "npm": ">=6",
+        "yarn": ">=1"
+      }
+    },
+    "node_modules/@testing-library/jest-dom/node_modules/dom-accessibility-api": {
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+      "resolved": "https://registry.npmjs.org/dom-accessibility-api/-/dom-accessibility-api-0.6.3.tgz",
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+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@testing-library/react": {
+      "version": "16.3.3",
+      "resolved": "https://registry.npmjs.org/@testing-library/react/-/react-16.3.3.tgz",
+      "integrity": "sha512-Uo193NgQbPMz6lrrhtRQQFcMC6Re/ELLFbbuVL30WDlZxlpZf9/lMHTAVxPRLw1q1iu9OJmR1c2BLiENRstdBg==",
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+      "license": "MIT",
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+      },
+      "engines": {
+        "node": ">=18"
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+        "@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"
+      },
+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        },
+        "@types/react-dom": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@testing-library/user-event": {
+      "version": "14.6.7",
+      "resolved": "https://registry.npmjs.org/@testing-library/user-event/-/user-event-14.6.7.tgz",
+      "integrity": "sha512-MPCpX8bxe8zS+JmmTwLp8jd0dy1rAm60Te/SL8JrQM3qvQJcBOs1d7IefJMyZzqM3EWBrDn/LWDt1BCGu4ASfg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12",
+        "npm": ">=6"
+      },
+      "peerDependencies": {
+        "@testing-library/dom": ">=7.21.4"
+      }
+    },
     "node_modules/@trickfilm400/rollup-plugin-off-main-thread": {
       "version": "3.0.0-pre1",
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@@ -2925,6 +3163,14 @@
         "node": ">=12"
       }
     },
+    "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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       "resolved": "https://registry.npmjs.org/@types/babel__core/-/babel__core-7.20.5.tgz",
@@ -3040,6 +3286,129 @@
         "vite": "^4.2.0 || ^5.0.0 || ^6.0.0 || ^7.0.0"
       }
     },
+    "node_modules/@vitest/expect": {
+      "version": "2.1.9",
+      "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-2.1.9.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/spy": "2.1.9",
+        "@vitest/utils": "2.1.9",
+        "chai": "^5.1.2",
+        "tinyrainbow": "^1.2.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
+    "node_modules/@vitest/mocker": {
+      "version": "2.1.9",
+      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-2.1.9.tgz",
+      "integrity": "sha512-tVL6uJgoUdi6icpxmdrn5YNo3g3Dxv+IHJBr0GXHaEdTcw3F+cPKnsXFhli6nO+f/6SDKPHEK1UN+k+TQv0Ehg==",
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+      "license": "MIT",
+      "dependencies": {
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+        "estree-walker": "^3.0.3",
+        "magic-string": "^0.30.12"
+      },
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+        "msw": {
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+        },
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+      }
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@@ -3088,6 +3457,16 @@
         "node": ">=0.4.0"
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+      "version": "7.1.4",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-7.1.4.tgz",
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+      "dev": true,
+      "license": "MIT",
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+    },
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@@ -3105,6 +3484,41 @@
         "url": "https://github.com/sponsors/epoberezkin"
       }
     },
+    "node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "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": {
+      "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"
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+    },
+    "node_modules/aria-query": {
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+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@types/node": "^18.0.0 || >=20.0.0",
+        "@vitest/browser": "2.1.9",
+        "@vitest/ui": "2.1.9",
+        "happy-dom": "*",
+        "jsdom": "*"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
+      }
+    },
+    "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",
@@ -6794,6 +7965,23 @@
         "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/workbox-background-sync": {
       "version": "7.4.1",
       "resolved": "https://registry.npmjs.org/workbox-background-sync/-/workbox-background-sync-7.4.1.tgz",
@@ -7014,6 +8202,45 @@
         "workbox-core": "7.4.1"
       }
     },
+    "node_modules/ws": {
+      "version": "8.21.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.21.3.tgz",
+      "integrity": "sha512-201TZ/kPWxoPr/OKWjquZR1SWKXcvxdH+e1xrx89b3YbmzLMFCLfnaG1HFIgWzJOEWZ7MvpK++odZufgYR50Rw==",
+      "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/frontend/package.json b/frontend/package.json
index 42820dc..bba9a72 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -7,6 +7,8 @@
     "dev": "vite",
     "build": "tsc --noEmit && vite build",
     "preview": "vite preview",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "test:e2e": "playwright test",
     "test:e2e:ui": "playwright test --ui"
   },
@@ -26,12 +28,17 @@
   "devDependencies": {
     "@playwright/test": "^1.47.2",
     "@tailwindcss/vite": "^4.3.3",
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.3",
+    "@testing-library/user-event": "^14.6.7",
     "@types/react": "^18.3.3",
     "@types/react-dom": "^18.3.0",
     "@vitejs/plugin-react": "^4.3.1",
+    "jsdom": "^25.0.1",
     "tailwindcss": "^4.3.3",
     "typescript": "^5.5.4",
     "vite": "^5.4.6",
-    "vite-plugin-pwa": "^0.20.5"
+    "vite-plugin-pwa": "^0.20.5",
+    "vitest": "^2.1.9"
   }
 }
diff --git a/frontend/src/api/client.test.ts b/frontend/src/api/client.test.ts
new file mode 100644
index 0000000..db62ac8
--- /dev/null
+++ b/frontend/src/api/client.test.ts
@@ -0,0 +1,85 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { apiRequest, ApiError, ladeDokumentAnsehen } from "./client";
+
+beforeEach(() => {
+  vi.stubGlobal("fetch", vi.fn());
+});
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+  vi.restoreAllMocks();
+});
+
+describe("apiRequest", () => {
+  it("gibt JSON bei Erfolg zurück", async () => {
+    (fetch as ReturnType<typeof vi.fn>).mockResolvedValue(
+      new Response(JSON.stringify({ ok: true }), { status: 200 })
+    );
+    const result = await apiRequest<{ ok: boolean }>("/irgendwas");
+    expect(result).toEqual({ ok: true });
+  });
+
+  it("wirft ApiError mit Status und Detail bei Nicht-2xx", async () => {
+    (fetch as ReturnType<typeof vi.fn>).mockResolvedValue(
+      new Response(JSON.stringify({ detail: "Duplikat" }), { status: 409 })
+    );
+    await expect(apiRequest("/dokumente")).rejects.toMatchObject({
+      status: 409,
+      detail: { detail: "Duplikat" },
+    });
+  });
+
+  it("liefert undefined bei 204 ohne Body-Parse-Versuch", async () => {
+    (fetch as ReturnType<typeof vi.fn>).mockResolvedValue(new Response(null, { status: 204 }));
+    const result = await apiRequest("/irgendwas", { method: "DELETE" });
+    expect(result).toBeUndefined();
+  });
+
+  it("ApiError bleibt auch ohne JSON-Body (z.B. leere 401-Antwort) funktionsfähig", async () => {
+    (fetch as ReturnType<typeof vi.fn>).mockResolvedValue(new Response(null, { status: 401 }));
+    await expect(apiRequest("/geschuetzt")).rejects.toMatchObject({ status: 401, detail: null });
+  });
+});
+
+describe("ladeDokumentAnsehen (Popup-Blocker-Fix)", () => {
+  it("öffnet das Tab-Fenster SOFORT synchron, bevor fetch abgeschlossen ist", async () => {
+    const tabStub = { location: { href: "" }, close: vi.fn() };
+    const openSpy = vi.spyOn(window, "open").mockReturnValue(tabStub as unknown as Window);
+    (fetch as ReturnType<typeof vi.fn>).mockResolvedValue(
+      new Response(new Blob(["pdf-inhalt"]), { status: 200 })
+    );
+    vi.stubGlobal("URL", { ...URL, createObjectURL: vi.fn().mockReturnValue("blob:fake-url") });
+
+    const promise = ladeDokumentAnsehen("abc-123");
+    // window.open muss VOR dem await fetch() aufgerufen worden sein - genau
+    // das war der ursprüngliche Bug (Popup-Blocker griff, weil open() erst
+    // nach dem await passierte und damit nicht mehr als Nutzer-Klick zählte).
+    expect(openSpy).toHaveBeenCalledWith("", "_blank");
+
+    await promise;
+    expect(tabStub.location.href).toBe("blob:fake-url");
+  });
+
+  it("fällt bei blockiertem Popup auf denselben Tab zurück statt zu crashen", async () => {
+    vi.spyOn(window, "open").mockReturnValue(null);
+    (fetch as ReturnType<typeof vi.fn>).mockResolvedValue(
+      new Response(new Blob(["pdf-inhalt"]), { status: 200 })
+    );
+    vi.stubGlobal("URL", { ...URL, createObjectURL: vi.fn().mockReturnValue("blob:fake-url") });
+    const ortsStub = { href: "" };
+    vi.stubGlobal("location", ortsStub);
+
+    await ladeDokumentAnsehen("abc-123");
+    expect(ortsStub.href).toBe("blob:fake-url");
+  });
+
+  it("schließt das leere Tab-Fenster wieder, wenn der Download fehlschlägt", async () => {
+    const tabStub = { location: { href: "" }, close: vi.fn() };
+    vi.spyOn(window, "open").mockReturnValue(tabStub as unknown as Window);
+    (fetch as ReturnType<typeof vi.fn>).mockResolvedValue(new Response(null, { status: 404 }));
+
+    await expect(ladeDokumentAnsehen("fehlt")).rejects.toBeInstanceOf(ApiError);
+    expect(tabStub.close).toHaveBeenCalled();
+  });
+});
diff --git a/frontend/src/components/CommandPalette.test.tsx b/frontend/src/components/CommandPalette.test.tsx
new file mode 100644
index 0000000..f25193a
--- /dev/null
+++ b/frontend/src/components/CommandPalette.test.tsx
@@ -0,0 +1,69 @@
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { MemoryRouter } from "react-router-dom";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { CommandPalette } from "./CommandPalette";
+import * as client from "../api/client";
+import { AuthProvider } from "../auth/AuthContext";
+
+function renderPalette() {
+  return render(
+    <MemoryRouter>
+      <AuthProvider>
+        <CommandPalette />
+      </AuthProvider>
+    </MemoryRouter>
+  );
+}
+
+beforeEach(() => {
+  vi.useFakeTimers({ shouldAdvanceTime: true });
+});
+
+afterEach(() => {
+  vi.useRealTimers();
+  vi.restoreAllMocks();
+});
+
+describe("CommandPalette", () => {
+  it("öffnet sich per Strg+K und schließt per Escape", () => {
+    renderPalette();
+    expect(screen.queryByRole("dialog")).not.toBeInTheDocument();
+
+    fireEvent.keyDown(window, { key: "k", ctrlKey: true });
+    expect(screen.getByRole("dialog")).toBeInTheDocument();
+
+    fireEvent.keyDown(window, { key: "Escape" });
+    expect(screen.queryByRole("dialog")).not.toBeInTheDocument();
+  });
+
+  it("sucht erst ab 2 Zeichen und debounced Backend-Aufrufe (250ms)", async () => {
+    const suchSpy = vi.spyOn(client, "apiRequest").mockResolvedValue([]);
+    renderPalette();
+    fireEvent.keyDown(window, { key: "k", ctrlKey: true });
+
+    const eingabe = screen.getByPlaceholderText("Objekt suchen oder Aktion wählen…");
+    fireEvent.change(eingabe, { target: { value: "K" } });
+    await vi.advanceTimersByTimeAsync(300);
+    expect(suchSpy).not.toHaveBeenCalled();
+
+    fireEvent.change(eingabe, { target: { value: "Kompresse" } });
+    await vi.advanceTimersByTimeAsync(300);
+    expect(suchSpy).toHaveBeenCalledWith("/suche?q=Kompresse");
+  });
+
+  it("zeigt Material-Treffer mit ueber_material-Hinweis im Code-Feld", async () => {
+    vi.spyOn(client, "apiRequest").mockResolvedValue([
+      { id: 7, code: "RTW-1", name: "RTW 1", ueber_material: "Kompresse" },
+    ]);
+    renderPalette();
+    fireEvent.keyDown(window, { key: "k", ctrlKey: true });
+    fireEvent.change(screen.getByPlaceholderText("Objekt suchen oder Aktion wählen…"), {
+      target: { value: "Kompresse" },
+    });
+    await vi.advanceTimersByTimeAsync(300);
+
+    await waitFor(() => expect(screen.getByText("RTW 1")).toBeInTheDocument());
+    expect(screen.getByText("RTW-1 · führt „Kompresse“")).toBeInTheDocument();
+  });
+});
diff --git a/frontend/src/hooks/useIsDesktop.test.ts b/frontend/src/hooks/useIsDesktop.test.ts
new file mode 100644
index 0000000..30be7f9
--- /dev/null
+++ b/frontend/src/hooks/useIsDesktop.test.ts
@@ -0,0 +1,44 @@
+import { act, renderHook } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { useIsDesktop } from "./useIsDesktop";
+
+function mockMatchMedia(anfangsWert: boolean) {
+  const listeners = new Set<(e: MediaQueryListEvent) => void>();
+  const mql = {
+    matches: anfangsWert,
+    addEventListener: (_: string, fn: (e: MediaQueryListEvent) => void) => listeners.add(fn),
+    removeEventListener: (_: string, fn: (e: MediaQueryListEvent) => void) => listeners.delete(fn),
+  };
+  vi.stubGlobal("matchMedia", vi.fn().mockReturnValue(mql));
+  return {
+    aendern(neuerWert: boolean) {
+      mql.matches = neuerWert;
+      listeners.forEach((fn) => fn({ matches: neuerWert } as MediaQueryListEvent));
+    },
+  };
+}
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+});
+
+describe("useIsDesktop", () => {
+  it("liefert den initialen matchMedia-Wert", () => {
+    mockMatchMedia(true);
+    const { result } = renderHook(() => useIsDesktop());
+    expect(result.current).toBe(true);
+  });
+
+  it("reagiert live auf einen Breakpoint-Wechsel (Resize)", () => {
+    const { aendern } = mockMatchMedia(false);
+    const { result } = renderHook(() => useIsDesktop());
+    expect(result.current).toBe(false);
+
+    act(() => aendern(true));
+    expect(result.current).toBe(true);
+
+    act(() => aendern(false));
+    expect(result.current).toBe(false);
+  });
+});
diff --git a/frontend/src/pages/ObjektListPage.test.tsx b/frontend/src/pages/ObjektListPage.test.tsx
new file mode 100644
index 0000000..98f6831
--- /dev/null
+++ b/frontend/src/pages/ObjektListPage.test.tsx
@@ -0,0 +1,79 @@
+import { render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { MemoryRouter } from "react-router-dom";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import * as client from "../api/client";
+import { ObjektListPage } from "./ObjektListPage";
+
+const OBJEKTE = [
+  { id: 1, code: "RTW-1", name: "RTW 1", standort_id: 10, status: "aktiv", letzte_kontrolle_am: null },
+  { id: 2, code: "KTW-1", name: "KTW 1", standort_id: 20, status: "aktiv", letzte_kontrolle_am: null },
+];
+const STANDORTE = [
+  { id: 10, name: "Wache Nord" },
+  { id: 20, name: "Wache Süd" },
+];
+
+function renderSeite() {
+  return render(
+    <MemoryRouter>
+      <ObjektListPage />
+    </MemoryRouter>
+  );
+}
+
+beforeEach(() => {
+  localStorage.clear();
+  vi.spyOn(client, "apiRequest").mockImplementation((pfad: string) => {
+    if (pfad === "/objekte") return Promise.resolve(OBJEKTE);
+    if (pfad === "/standorte") return Promise.resolve(STANDORTE);
+    return Promise.reject(new Error(`unerwarteter Pfad: ${pfad}`));
+  });
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+});
+
+describe("ObjektListPage", () => {
+  it("gruppiert Objekte standardmäßig nach Standort", async () => {
+    renderSeite();
+    await waitFor(() => expect(screen.getByText("Wache Nord", { exact: false })).toBeInTheDocument());
+    expect(screen.getByText("Wache Süd", { exact: false })).toBeInTheDocument();
+    expect(screen.getByText("RTW 1")).toBeInTheDocument();
+    expect(screen.getByText("KTW 1")).toBeInTheDocument();
+  });
+
+  it("Umschalter wechselt auf flache Kachel-Ansicht ohne Standort-Gruppen", async () => {
+    const nutzer = userEvent.setup();
+    renderSeite();
+    await waitFor(() => expect(screen.getByText("RTW 1")).toBeInTheDocument());
+
+    await nutzer.click(screen.getByRole("button", { name: "Kacheln" }));
+
+    expect(screen.queryByText("Wache Nord", { exact: false })).not.toBeInTheDocument();
+    expect(screen.getByText("RTW 1")).toBeInTheDocument();
+    expect(screen.getByText("KTW 1")).toBeInTheDocument();
+  });
+
+  it("merkt die gewählte Ansicht über localStorage", async () => {
+    const nutzer = userEvent.setup();
+    renderSeite();
+    await waitFor(() => expect(screen.getByText("RTW 1")).toBeInTheDocument());
+    await nutzer.click(screen.getByRole("button", { name: "Kacheln" }));
+
+    expect(localStorage.getItem("mabea-objekte-ansicht")).toBe("kacheln");
+  });
+
+  it("Suchfeld filtert nach Name und Code", async () => {
+    const nutzer = userEvent.setup();
+    renderSeite();
+    await waitFor(() => expect(screen.getByText("RTW 1")).toBeInTheDocument());
+
+    await nutzer.type(screen.getByPlaceholderText("Suche oder Code…"), "KTW");
+
+    expect(screen.queryByText("RTW 1")).not.toBeInTheDocument();
+    expect(screen.getByText("KTW 1")).toBeInTheDocument();
+  });
+});
diff --git a/frontend/src/test/setup.ts b/frontend/src/test/setup.ts
new file mode 100644
index 0000000..d0cca0a
--- /dev/null
+++ b/frontend/src/test/setup.ts
@@ -0,0 +1,24 @@
+import { cleanup } from "@testing-library/react";
+import { afterEach } from "vitest";
+
+import "@testing-library/jest-dom/vitest";
+
+afterEach(() => {
+  cleanup();
+});
+
+// jsdom kennt window.matchMedia nicht - Default-Stub (immer "matches: false",
+// also "mobil"), Tests die eine echte Breakpoint-Reaktion prüfen (useIsDesktop)
+// überschreiben das gezielt selbst.
+if (!window.matchMedia) {
+  window.matchMedia = (query: string) => ({
+    matches: false,
+    media: query,
+    onchange: null,
+    addListener: () => {},
+    removeListener: () => {},
+    addEventListener: () => {},
+    removeEventListener: () => {},
+    dispatchEvent: () => false,
+  });
+}
diff --git a/frontend/vitest.config.ts b/frontend/vitest.config.ts
new file mode 100644
index 0000000..a1dcc5f
--- /dev/null
+++ b/frontend/vitest.config.ts
@@ -0,0 +1,17 @@
+import react from "@vitejs/plugin-react";
+import { defineConfig } from "vitest/config";
+
+// Separat von vite.config.ts, damit das eigentliche Build-Setup (PWA-Plugin,
+// Tailwind) unangetastet bleibt - Tests brauchen weder Service-Worker-
+// Generierung noch das Tailwind-Vite-Plugin.
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    environment: "jsdom",
+    setupFiles: ["./src/test/setup.ts"],
+    css: false,
+    // e2e/*.spec.ts gehören Playwright (eigener Testrunner, andere API) -
+    // sonst versucht Vitest sie mitzusammeln und crasht.
+    exclude: ["e2e/**", "node_modules/**"],
+  },
+});