Add extensive form tests and enhanced error handling for auth components.

- Introduced comprehensive tests for `RegisterForm`, `PasswordResetRequestForm`, and `PasswordResetConfirmForm` covering successful submissions, validation errors, and API error handling.
- Refactored forms to handle unexpected errors gracefully and improve test coverage for edge cases.
- Updated `crypto` and `storage` modules with robust error handling for storage issues and encryption key management.
- Removed unused `axios-mock-adapter` dependency for cleaner dependency management.

frontend/package-lock.json

@@ -51,7 +51,6 @@
         "@types/node": "^20",
         "@types/react": "^19",
         "@types/react-dom": "^19",
-        "axios-mock-adapter": "^2.1.0",
         "eslint": "^9",
         "eslint-config-next": "15.2.0",
         "jest": "^30.2.0",
@@ -5015,20 +5014,6 @@
         "proxy-from-env": "^1.1.0"
       }
     },
-    "node_modules/axios-mock-adapter": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/axios-mock-adapter/-/axios-mock-adapter-2.1.0.tgz",
-      "integrity": "sha512-AZUe4OjECGCNNssH8SOdtneiQELsqTsat3SQQCWLPjN436/H+L9AjWfV7bF+Zg/YL9cgbhrz5671hoh+Tbn98w==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "fast-deep-equal": "^3.1.3",
-        "is-buffer": "^2.0.5"
-      },
-      "peerDependencies": {
-        "axios": ">= 0.17.0"
-      }
-    },
     "node_modules/axobject-query": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/axobject-query/-/axobject-query-4.1.0.tgz",
@@ -7876,30 +7861,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/is-buffer": {
-      "version": "2.0.5",
-      "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.5.tgz",
-      "integrity": "sha512-i2R6zNFDwgEHJyQUtJEk0XFi1i0dPFn/oqjK3/vPCcDeJvW5NQ83V8QbicfF1SupOaB0h8ntgBC2YiE7dfyctQ==",
-      "dev": true,
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/feross"
-        },
-        {
-          "type": "patreon",
-          "url": "https://www.patreon.com/feross"
-        },
-        {
-          "type": "consulting",
-          "url": "https://feross.org/support"
-        }
-      ],
-      "license": "MIT",
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/is-bun-module": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/is-bun-module/-/is-bun-module-2.0.0.tgz",