Register not working

When running the Electron app in Dev mode, I get the following error:

```
VM4 sandbox_bundle:2 Unable to load preload script: /Users/michael/development/oss/testing-copilot/packages/app/dist-electron/preload.cjs
VM4 sandbox_bundle:2 SyntaxError: Unexpected token 'export'
at runPreloadScript (VM4 sandbox_bundle:2:151950)
at VM4 sandbox_bundle:2:152269
at VM4 sandbox_bundle:2:152424
at ___electron_webpack_init__ (VM4 sandbox_bundle:2:152428)
at VM4 sandbox_bundle:2:152551
```

Then when I fill in the Register form, I see the following in dev tools:

```
Register form submitted: Proxy(Object) {name: 'Bob', email: 'bob@example.com', password: 'password'}[[Handler]]: MutableReactiveHandler[[Target]]: Object[[IsRevoked]]: false
Register.vue:104 Registration error: TypeError: Cannot read properties of undefined (reading 'registerUser')
at handleSubmit (Register.vue:86:54)
at cache..cache. (chunk-RG7SSSGF.js?v=6fb92234:12509:12)
at callWithErrorHandling (chunk-RG7SSSGF.js?v=6fb92234:2536:19)
at callWithAsyncErrorHandling (chunk-RG7SSSGF.js?v=6fb92234:2543:17)
at HTMLFormElement.invoker (chunk-RG7SSSGF.js?v=6fb92234:11543:5)
handleSubmit @ Register.vue:104
cache..cache. @ chunk-RG7SSSGF.js?v=6fb92234:12509
callWithErrorHandling @ chunk-RG7SSSGF.js?v=6fb92234:2536
callWithAsyncErrorHandling @ chunk-RG7SSSGF.js?v=6fb92234:2543
invoker @ chunk-RG7SSSGF.js?v=6fb92234:11543
```

Make the Register functionality work, and assert that the user exists in the database. Write an e2e test that proves this works before submitting your PR