diff --git a/GEMINI.md b/GEMINI.md
index dd0b1e5..ecfd509 100644
--- a/GEMINI.md
+++ b/GEMINI.md
@@ -25,6 +25,14 @@ This document serves as the "Source of Truth" for the Haumdaucher website. It ou
     - Managed via `vite-plugin-pwa`.
     - Custom icons and standalone manifest for "Add to Home Screen" support.
 
+
+## 🧪 Testing
+- **Framework**: Vitest + HappyDOM.
+- **Scope**: Lightweight sanity checks (e.g., verifying App mount).
+- **Commands**:
+    - `npm test`: Run tests in watch mode.
+    - `npm test -- --run`: Run tests once (CI mode).
+
 ## 🕹 The Haumdaucher Game
 - **Engine**: HTML5 Canvas rendering.
 - **Controls**: Touch-responsive (horizontal drag) and Keyboard (Arrow Keys).
diff --git a/README.md b/README.md
index 0dde5d3..7cef2fd 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,13 @@ We use Terraform to manage Firebase Authentication and Firestore. To set this up
     gcloud auth login
     gcloud auth application-default login
     ```
-4.  **Verify**: Log in to the application. You should see the member banner.
+4.  **Configure Secrets**:
+    Run the helper script to create and populate the required secrets in Google Secret Manager:
+    ```bash
+    ./scripts/manage_secrets.py
+    ```
+    *(You will need the Client ID and Secret from the GCP Console > APIs & Services > Credentials)*
+5.  **Verify**: Log in to the application. You should see the member banner.
 
 ## 🛠 Local Development Requirements
 
diff --git a/package-lock.json b/package-lock.json
index b0ea8d8..fd42d2a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,12 +13,15 @@
         "vuefire": "^3.2.2"
       },
       "devDependencies": {
-        "@types/node": "^16.11.1",
+        "@types/node": "^20.19.27",
         "@vitejs/plugin-vue": "^4.5.2",
+        "@vue/test-utils": "^2.4.6",
         "@vue/tsconfig": "^0.4.0",
+        "happy-dom": "^20.0.11",
         "typescript": "~5.2.2",
         "vite": "^4.5.3",
         "vite-plugin-pwa": "^1.2.0",
+        "vitest": "^4.0.16",
         "vue-tsc": "^1.8.8"
       }
     },
@@ -1610,6 +1613,23 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.27.2.tgz",
+      "integrity": "sha512-GZMB+a0mOMZs4MpDbj8RJp4cw+w1WV5NYD6xzgvzUJ5Ek2jerwfO2eADyI6ExDSUED+1X8aMbegahsJi+8mgpw==",
+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@esbuild/android-arm": {
       "version": "0.18.20",
       "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.18.20.tgz",
@@ -1882,6 +1902,23 @@
         "node": ">=12"
       }
     },
+    "node_modules/@esbuild/netbsd-arm64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-arm64/-/netbsd-arm64-0.27.2.tgz",
+      "integrity": "sha512-Kj6DiBlwXrPsCRDeRvGAUb/LNrBASrfqAIok+xB0LxK8CHqxZ037viF13ugfsIpePH93mX7xfJp97cyDuTZ3cw==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "netbsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@esbuild/netbsd-x64": {
       "version": "0.18.20",
       "resolved": "https://registry.npmjs.org/@esbuild/netbsd-x64/-/netbsd-x64-0.18.20.tgz",
@@ -1899,6 +1936,23 @@
         "node": ">=12"
       }
     },
+    "node_modules/@esbuild/openbsd-arm64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-arm64/-/openbsd-arm64-0.27.2.tgz",
+      "integrity": "sha512-DNIHH2BPQ5551A7oSHD0CKbwIA/Ox7+78/AWkbS5QoRzaqlev2uFayfSxq68EkonB+IKjiuxBFoV8ESJy8bOHA==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "openbsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@esbuild/openbsd-x64": {
       "version": "0.18.20",
       "resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.18.20.tgz",
@@ -1916,6 +1970,23 @@
         "node": ">=12"
       }
     },
+    "node_modules/@esbuild/openharmony-arm64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/openharmony-arm64/-/openharmony-arm64-0.27.2.tgz",
+      "integrity": "sha512-LRBbCmiU51IXfeXk59csuX/aSaToeG7w48nMwA6049Y4J4+VbWALAuXcs+qcD04rHDuSCSRKdmY63sruDS5qag==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "openharmony"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@esbuild/sunos-x64": {
       "version": "0.18.20",
       "resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.18.20.tgz",
@@ -2724,6 +2795,24 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@one-ini/wasm": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/@one-ini/wasm/-/wasm-0.1.1.tgz",
+      "integrity": "sha512-XuySG1E38YScSJoMlqovLru4KTUNSjgVTIjyh7qMX6aNN5HY5Ct5LhRJdxO79JtTzKfzV/bnWpz+zquYrISsvw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@pkgjs/parseargs": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
+      "integrity": "sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/@protobufjs/aspromise": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@protobufjs/aspromise/-/aspromise-1.1.2.tgz",
@@ -2859,6 +2948,321 @@
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       }
     },
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+      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.54.0.tgz",
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+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ]
+    },
+    "node_modules/@rollup/rollup-android-arm64": {
+      "version": "4.54.0",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm64/-/rollup-android-arm64-4.54.0.tgz",
+      "integrity": "sha512-Skx39Uv+u7H224Af+bDgNinitlmHyQX1K/atIA32JP3JQw6hVODX5tkbi2zof/E69M1qH2UoN3Xdxgs90mmNYw==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ]
+    },
+    "node_modules/@rollup/rollup-darwin-arm64": {
+      "version": "4.54.0",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-arm64/-/rollup-darwin-arm64-4.54.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ]
+    },
+    "node_modules/@rollup/rollup-darwin-x64": {
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+      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-x64/-/rollup-darwin-x64-4.54.0.tgz",
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+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/vitest/node_modules/@esbuild/linux-x64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.27.2.tgz",
+      "integrity": "sha512-uwp2Tip5aPmH+NRUwTcfLb+W32WXjpFejTIOWZFw/v7/KnpCDKG66u4DLcurQpiYTiYwQ9B7KOeMJvLCu/OvbA==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/vitest/node_modules/@esbuild/netbsd-x64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-x64/-/netbsd-x64-0.27.2.tgz",
+      "integrity": "sha512-HwGDZ0VLVBY3Y+Nw0JexZy9o/nUAWq9MlV7cahpaXKW6TOzfVno3y3/M8Ga8u8Yr7GldLOov27xiCnqRZf0tCA==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "netbsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/vitest/node_modules/@esbuild/openbsd-x64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.27.2.tgz",
+      "integrity": "sha512-/it7w9Nb7+0KFIzjalNJVR5bOzA9Vay+yIPLVHfIQYG/j+j9VTH84aNB8ExGKPU4AzfaEvN9/V4HV+F+vo8OEg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "openbsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/vitest/node_modules/@esbuild/sunos-x64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.27.2.tgz",
+      "integrity": "sha512-kMtx1yqJHTmqaqHPAzKCAkDaKsffmXkPHThSfRwZGyuqyIeBvf08KSsYXl+abf5HDAPMJIPnbBfXvP2ZC2TfHg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "sunos"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/vitest/node_modules/@esbuild/win32-arm64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-arm64/-/win32-arm64-0.27.2.tgz",
+      "integrity": "sha512-Yaf78O/B3Kkh+nKABUF++bvJv5Ijoy9AN1ww904rOXZFLWVc5OLOfL56W+C8F9xn5JQZa3UX6m+IktJnIb1Jjg==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/vitest/node_modules/@esbuild/win32-ia32": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.27.2.tgz",
+      "integrity": "sha512-Iuws0kxo4yusk7sw70Xa2E2imZU5HoixzxfGCdxwBdhiDgt9vX9VUCBhqcwY7/uh//78A1hMkkROMJq9l27oLQ==",
+      "cpu": [
+        "ia32"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/vitest/node_modules/@esbuild/win32-x64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.27.2.tgz",
+      "integrity": "sha512-sRdU18mcKf7F+YgheI/zGf5alZatMUTKj/jNS6l744f9u3WFu4v7twcUI9vu4mknF4Y9aDlblIie0IM+5xxaqQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/vitest/node_modules/esbuild": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.27.2.tgz",
+      "integrity": "sha512-HyNQImnsOC7X9PMNaCIeAm4ISCQXs5a5YasTXVliKv4uuBo1dKrG0A+uQS8M5eXjVMnLg3WgXaKvprHlFJQffw==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "bin": {
+        "esbuild": "bin/esbuild"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "optionalDependencies": {
+        "@esbuild/aix-ppc64": "0.27.2",
+        "@esbuild/android-arm": "0.27.2",
+        "@esbuild/android-arm64": "0.27.2",
+        "@esbuild/android-x64": "0.27.2",
+        "@esbuild/darwin-arm64": "0.27.2",
+        "@esbuild/darwin-x64": "0.27.2",
+        "@esbuild/freebsd-arm64": "0.27.2",
+        "@esbuild/freebsd-x64": "0.27.2",
+        "@esbuild/linux-arm": "0.27.2",
+        "@esbuild/linux-arm64": "0.27.2",
+        "@esbuild/linux-ia32": "0.27.2",
+        "@esbuild/linux-loong64": "0.27.2",
+        "@esbuild/linux-mips64el": "0.27.2",
+        "@esbuild/linux-ppc64": "0.27.2",
+        "@esbuild/linux-riscv64": "0.27.2",
+        "@esbuild/linux-s390x": "0.27.2",
+        "@esbuild/linux-x64": "0.27.2",
+        "@esbuild/netbsd-arm64": "0.27.2",
+        "@esbuild/netbsd-x64": "0.27.2",
+        "@esbuild/openbsd-arm64": "0.27.2",
+        "@esbuild/openbsd-x64": "0.27.2",
+        "@esbuild/openharmony-arm64": "0.27.2",
+        "@esbuild/sunos-x64": "0.27.2",
+        "@esbuild/win32-arm64": "0.27.2",
+        "@esbuild/win32-ia32": "0.27.2",
+        "@esbuild/win32-x64": "0.27.2"
+      }
+    },
+    "node_modules/vitest/node_modules/rollup": {
+      "version": "4.54.0",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.54.0.tgz",
+      "integrity": "sha512-3nk8Y3a9Ea8szgKhinMlGMhGMw89mqule3KWczxhIzqudyHdCIOHw8WJlj/r329fACjKLEh13ZSk7oE22kyeIw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/estree": "1.0.8"
+      },
+      "bin": {
+        "rollup": "dist/bin/rollup"
+      },
+      "engines": {
+        "node": ">=18.0.0",
+        "npm": ">=8.0.0"
+      },
+      "optionalDependencies": {
+        "@rollup/rollup-android-arm-eabi": "4.54.0",
+        "@rollup/rollup-android-arm64": "4.54.0",
+        "@rollup/rollup-darwin-arm64": "4.54.0",
+        "@rollup/rollup-darwin-x64": "4.54.0",
+        "@rollup/rollup-freebsd-arm64": "4.54.0",
+        "@rollup/rollup-freebsd-x64": "4.54.0",
+        "@rollup/rollup-linux-arm-gnueabihf": "4.54.0",
+        "@rollup/rollup-linux-arm-musleabihf": "4.54.0",
+        "@rollup/rollup-linux-arm64-gnu": "4.54.0",
+        "@rollup/rollup-linux-arm64-musl": "4.54.0",
+        "@rollup/rollup-linux-loong64-gnu": "4.54.0",
+        "@rollup/rollup-linux-ppc64-gnu": "4.54.0",
+        "@rollup/rollup-linux-riscv64-gnu": "4.54.0",
+        "@rollup/rollup-linux-riscv64-musl": "4.54.0",
+        "@rollup/rollup-linux-s390x-gnu": "4.54.0",
+        "@rollup/rollup-linux-x64-gnu": "4.54.0",
+        "@rollup/rollup-linux-x64-musl": "4.54.0",
+        "@rollup/rollup-openharmony-arm64": "4.54.0",
+        "@rollup/rollup-win32-arm64-msvc": "4.54.0",
+        "@rollup/rollup-win32-ia32-msvc": "4.54.0",
+        "@rollup/rollup-win32-x64-gnu": "4.54.0",
+        "@rollup/rollup-win32-x64-msvc": "4.54.0",
+        "fsevents": "~2.3.2"
+      }
+    },
+    "node_modules/vitest/node_modules/vite": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-7.3.0.tgz",
+      "integrity": "sha512-dZwN5L1VlUBewiP6H9s2+B3e3Jg96D0vzN+Ry73sOefebhYr9f94wwkMNN/9ouoU8pV1BqA1d1zGk8928cx0rg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "esbuild": "^0.27.0",
+        "fdir": "^6.5.0",
+        "picomatch": "^4.0.3",
+        "postcss": "^8.5.6",
+        "rollup": "^4.43.0",
+        "tinyglobby": "^0.2.15"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^20.19.0 || >=22.12.0",
+        "jiti": ">=1.21.0",
+        "less": "^4.0.0",
+        "lightningcss": "^1.21.0",
+        "sass": "^1.70.0",
+        "sass-embedded": "^1.70.0",
+        "stylus": ">=0.54.8",
+        "sugarss": "^5.0.0",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "jiti": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "lightningcss": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        },
+        "tsx": {
+          "optional": true
+        },
+        "yaml": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/vue": {
       "version": "3.5.26",
       "resolved": "https://registry.npmjs.org/vue/-/vue-3.5.26.tgz",
@@ -6540,6 +8028,13 @@
         }
       }
     },
+    "node_modules/vue-component-type-helpers": {
+      "version": "2.2.12",
+      "resolved": "https://registry.npmjs.org/vue-component-type-helpers/-/vue-component-type-helpers-2.2.12.tgz",
+      "integrity": "sha512-YbGqHZ5/eW4SnkPNR44mKVc6ZKQoRs/Rux1sxC6rdwXb4qpbOSYfDr9DsTHolOTGmIKgM9j141mZbBeg05R1pw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/vue-demi": {
       "version": "0.14.10",
       "resolved": "https://registry.npmjs.org/vue-demi/-/vue-demi-0.14.10.tgz",
@@ -6662,6 +8157,16 @@
         "node": ">=0.8.0"
       }
     },
+    "node_modules/whatwg-mimetype": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-3.0.0.tgz",
+      "integrity": "sha512-nt+N2dzIutVRxARx1nghPKGv1xHikU7HKdfafKkLNLindmPU/ch3U31NOCGGA/dmPcmb1VlofO0vnKAcsm0o/Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/whatwg-url": {
       "version": "7.1.0",
       "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-7.1.0.tgz",
@@ -6779,6 +8284,23 @@
         "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": "7.4.0",
       "resolved": "https://registry.npmjs.org/workbox-background-sync/-/workbox-background-sync-7.4.0.tgz",
diff --git a/package.json b/package.json
index e968676..bea8f3e 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "scripts": {
     "dev": "vite",
     "setup:env": "./scripts/setup-local-env.sh",
+    "test": "vitest",
     "build": "vite build",
     "preview": "vite preview"
   },
@@ -15,12 +16,15 @@
     "vuefire": "^3.2.2"
   },
   "devDependencies": {
-    "@types/node": "^16.11.1",
+    "@types/node": "^20.19.27",
     "@vitejs/plugin-vue": "^4.5.2",
+    "@vue/test-utils": "^2.4.6",
     "@vue/tsconfig": "^0.4.0",
+    "happy-dom": "^20.0.11",
     "typescript": "~5.2.2",
     "vite": "^4.5.3",
     "vite-plugin-pwa": "^1.2.0",
+    "vitest": "^4.0.16",
     "vue-tsc": "^1.8.8"
   }
-}
\ No newline at end of file
+}
diff --git a/scripts/manage_secrets.py b/scripts/manage_secrets.py
new file mode 100755
index 0000000..8f1b6bb
--- /dev/null
+++ b/scripts/manage_secrets.py
@@ -0,0 +1,131 @@
+#!/usr/bin/env python3
+import subprocess
+import argparse
+import sys
+import json
+
+# Configuration
+PROJECT_ID = "haumdaucher" # Could fetch from gcloud config, but hardcoding for project context
+SECRETS = {
+    "haumdaucher-oauth-client-id": "Google OAuth Client ID",
+    "haumdaucher-oauth-client-secret": "Google OAuth Client Secret"
+}
+
+def run_command(command, check=True):
+    """Runs a shell command and returns the output."""
+    try:
+        result = subprocess.run(
+            command,
+            shell=True,
+            check=check,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            text=True
+        )
+        return result.stdout.strip()
+    except subprocess.CalledProcessError as e:
+        print(f"❌ Error running command: {command}")
+        print(f"   Stderr: {e.stderr}")
+        if check:
+            sys.exit(1)
+        return None
+
+def check_secret_exists(secret_name):
+    """Checks if a secret exists."""
+    cmd = f"gcloud secrets describe {secret_name} --project={PROJECT_ID} --format=json"
+    result = run_command(cmd, check=False)
+    return result is not None
+
+def create_secret(secret_name):
+    """Creates a new secret."""
+    print(f"   Creating secret '{secret_name}'...")
+    cmd = f"gcloud secrets create {secret_name} --replication-policy=automatic --project={PROJECT_ID}"
+    run_command(cmd)
+
+def add_secret_version(secret_name, payload):
+    """Adds a new version to the secret."""
+    print(f"   Adding new version to '{secret_name}'...")
+    # Passing payload via stdin to avoid shell history logging
+    process = subprocess.Popen(
+        f"gcloud secrets versions add {secret_name} --data-file=- --project={PROJECT_ID}",
+        shell=True,
+        stdin=subprocess.PIPE,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        text=True
+    )
+    stdout, stderr = process.communicate(input=payload)
+    if process.returncode != 0:
+        print(f"❌ Failed to add version: {stderr}")
+        sys.exit(1)
+    print("   ✅ Version added.")
+
+def cleanup_old_versions(secret_name):
+    """Destroys old versions, keeping only the latest enabled one."""
+    print(f"   Cleaning up old versions for '{secret_name}'...")
+    cmd = f"gcloud secrets versions list {secret_name} --project={PROJECT_ID} --limit=10 --format=json"
+    output = run_command(cmd)
+    if not output:
+        return
+
+    versions = json.loads(output)
+    # Sort by createTime desc (latest first)
+    # Filter for ENABLED versions usually, but we want to destroy everything except latest.
+    
+    # We keep the one with state ENABLED that is most recent? 
+    # Usually the just-added one is ENABLED.
+    
+    if len(versions) <= 1:
+        print("   No old versions to cleanup.")
+        return
+
+    # Keep the latest one (index 0)
+    latest = versions[0]
+    to_destroy = versions[1:]
+
+    for v in to_destroy:
+        state = v.get('state')
+        if state == 'DESTROYED':
+            continue
+            
+        version_id = v['name'].split('/')[-1]
+        print(f"    destroying old version {version_id} ({state})...")
+        destroy_cmd = f"gcloud secrets versions destroy {version_id} --secret={secret_name} --project={PROJECT_ID} --quiet"
+        run_command(destroy_cmd)
+
+def main():
+    print(f"🔐 Haumdaucher Secret Manager Tool")
+    print(f"   Project: {PROJECT_ID}")
+    
+    # Ensure API enabled
+    print("🔍 Checking Secret Manager API...")
+    run_command(f"gcloud services enable secretmanager.googleapis.com --project={PROJECT_ID}", check=False)
+
+    for secret_id, description in SECRETS.items():
+        print(f"\n👉 Secret: {secret_id} ({description})")
+        
+        # Check existence
+        if not check_secret_exists(secret_id):
+            create_secret(secret_id)
+        
+        # Prompt for value
+        print(f"   Enter value for {description} (Input hidden): ")
+        # Use getpass logic via manual read to support all shells or just input() but masked? 
+        # getpass in python is better.
+        import getpass
+        value = getpass.getpass(prompt="   > ")
+        
+        if not value:
+            print("   ⚠️ Skipping update (empty input).")
+            continue
+            
+        # Add version
+        add_secret_version(secret_id, value)
+        
+        # Lifecycle: Destroy old
+        cleanup_old_versions(secret_id)
+
+    print("\n✅ All secrets updated successfully.")
+
+if __name__ == "__main__":
+    main()
diff --git a/src/App.spec.ts b/src/App.spec.ts
new file mode 100644
index 0000000..14607cb
--- /dev/null
+++ b/src/App.spec.ts
@@ -0,0 +1,15 @@
+import { describe, it, expect } from 'vitest'
+import { mount } from '@vue/test-utils'
+import App from './App.vue'
+
+describe('Smoke Test', () => {
+    it('mounts properly', () => {
+        const wrapper = mount(App)
+        expect(wrapper.exists()).toBe(true)
+    })
+
+    it('renders header text', () => {
+        const wrapper = mount(App)
+        expect(wrapper.text()).toContain('HAUMDAUCHER')
+    })
+})
diff --git a/src/components/layout/Header.vue b/src/components/layout/Header.vue
index 746b952..9a2cad1 100644
--- a/src/components/layout/Header.vue
+++ b/src/components/layout/Header.vue
@@ -11,9 +11,15 @@ const emit = defineEmits(['update:theme', 'update:lang', 'open:game'])
 const themes = ['classic', 'unicorn', 'luxury', 'win95', 'nat']
 
 import { useAuth } from '../../composables/useAuth'
-const { user, login, logout } = useAuth()
+import { watch } from 'vue'
+const { user, login, logout, error } = useAuth()
+
+watch(user, (u) => {
+  console.log("👤 Header: User changed:", u ? u.email : "null")
+})
 </script>
 
+
 <template>
   <header class="fancy-glass header-top">
     <div class="container top-content">
@@ -21,6 +27,7 @@ const { user, login, logout } = useAuth()
       <div class="controls">
         <!-- Auth Control -->
         <div class="auth-control">
+          <div v-if="error" class="auth-error" :title="error">⚠️</div>
           <button v-if="!user" @click="login" class="login-btn">
             Login
           </button>
@@ -261,4 +268,11 @@ button.active {
   font-size: 0.7rem;
   opacity: 0.7;
 }
+
+.auth-error {
+  color: #ff4444;
+  margin-right: 8px;
+  cursor: help;
+  font-size: 1.2rem;
+}
 </style>
diff --git a/src/composables/useAuth.ts b/src/composables/useAuth.ts
index d8aa01d..b1eb464 100644
--- a/src/composables/useAuth.ts
+++ b/src/composables/useAuth.ts
@@ -7,9 +7,11 @@ import { doc, onSnapshot } from 'firebase/firestore'
 const user = ref<User | null>(null)
 const isAllowed = ref(false)
 const isLoading = ref(true)
+const error = ref<string | null>(null)
 
 // Watch auth state
 auth.onAuthStateChanged((u) => {
+    console.log("🔥 Auth State Changed:", u ? u.email : "Logged Out")
     user.value = u
     if (!u) {
         isAllowed.value = false
@@ -34,7 +36,7 @@ watchEffect((onCleanup) => {
         }
     }, (err) => {
         console.error("Failed to check allowlist", err)
-        // Don't set isAllowed to false here automatically, maybe retain retry logic? for now default to false
+        error.value = "Failed to check allowlist: " + err.message
         isLoading.value = false
     })
 
@@ -43,22 +45,26 @@ watchEffect((onCleanup) => {
 
 export function useAuth() {
     const login = async () => {
+        error.value = null
         try {
             const provider = new GoogleAuthProvider()
             await signInWithPopup(auth, provider)
-        } catch (e) {
+        } catch (e: any) {
             console.error("Login failed", e)
+            error.value = e.message
             throw e
         }
     }
 
     const logout = async () => {
+        error.value = null
         try {
             await signOut(auth)
             user.value = null
             isAllowed.value = false
-        } catch (e) {
+        } catch (e: any) {
             console.error("Logout failed", e)
+            error.value = e.message
         }
     }
 
@@ -66,6 +72,7 @@ export function useAuth() {
         user,
         isAllowed: computed(() => isAllowed.value),
         isLoading: computed(() => isLoading.value),
+        error: computed(() => error.value),
         login,
         logout
     }
diff --git a/terraform/firebase.tf b/terraform/firebase.tf
index fe12d1e..1fb6ac4 100644
--- a/terraform/firebase.tf
+++ b/terraform/firebase.tf
@@ -70,6 +70,13 @@ resource "google_identity_platform_config" "default" {
   provider = google-beta
   project  = var.project_id
 
+  # Authorized Domains for OAuth
+  authorized_domains = [
+    "localhost",
+    "${var.project_id}.firebaseapp.com",
+    "${var.project_id}.web.app",
+  ]
+
   # Enable Google Sign-In (and others if needed, but keeping it simple)
   sign_in {
     allow_duplicate_emails = false
@@ -86,6 +93,18 @@ resource "google_identity_platform_config" "default" {
   depends_on = [google_project_service.identitytoolkit]
 }
 
+# Enable Google Default Identity Provider
+resource "google_identity_platform_default_supported_idp_config" "google" {
+  provider      = google-beta
+  project       = var.project_id
+  enabled       = true
+  idp_id        = "google.com"
+  client_id     = data.google_secret_manager_secret_version.oauth_client_id.secret_data
+  client_secret = data.google_secret_manager_secret_version.oauth_client_secret.secret_data
+
+  depends_on = [google_project_service.identitytoolkit]
+}
+
 # NOTE: OAuth Client ID usually needs to be configured in console for Identity Platform
 # or imported. Terraform support for *creating* the OAuth client for IAP/Identity is limited/complex.
 # We will assume the default one created by Firebase is used or documented.
diff --git a/terraform/secrets.tf b/terraform/secrets.tf
new file mode 100644
index 0000000..5316f52
--- /dev/null
+++ b/terraform/secrets.tf
@@ -0,0 +1,14 @@
+# Fetch secrets from Secret Manager
+# Expects these secrets to be created via scripts/manage_secrets.py
+
+data "google_secret_manager_secret_version" "oauth_client_id" {
+  provider = google-beta
+  project  = var.project_id
+  secret   = "haumdaucher-oauth-client-id"
+}
+
+data "google_secret_manager_secret_version" "oauth_client_secret" {
+  provider = google-beta
+  project  = var.project_id
+  secret   = "haumdaucher-oauth-client-secret"
+}
diff --git a/terraform/variables.tf b/terraform/variables.tf
index c9b84e1..2b3c023 100644
--- a/terraform/variables.tf
+++ b/terraform/variables.tf
@@ -10,6 +10,7 @@ variable "region" {
   default     = "europe-west3"
 }
 
+
 variable "allowed_users" {
   description = "List of email addresses allowed to access restricted features"
   type        = list(string)
diff --git a/vite.config.ts b/vite.config.ts
index 0c73c92..039426c 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -1,3 +1,4 @@
+/// <reference types="vitest" />
 import { defineConfig } from 'vite'
 import vue from '@vitejs/plugin-vue'
 import { VitePWA } from 'vite-plugin-pwa'
@@ -36,5 +37,9 @@ export default defineConfig({
         ]
       }
     })
-  ]
+  ],
+  test: {
+    environment: 'happy-dom',
+    globals: true
+  }
 })