fix(login): make UI logic flow between Sign Up and Sign In the same (@AzureNightlock)

[AzureNightlock]

Description

This PR: Fixes the difference in UI logic flow between Sign Up and Sign In.

• Added a new signUp class to the sign-up button in the login.html to match the existing signIn class.

• Added cursor: pointer for the "Remember me" checkbox.

• Added loginForm state.

• Added helper functions for sign-in button state: enableSignInButton and disableSignInButton.

• Made the sign-up button qs more specific by using the signUp class.

• Renamed isFormComplete to isRegisterFormComplete and added isLoginFormComplete.

• Added update for Sign In(updateSignInButton()).

• Added SignInData and getSignInData.

• Updated getSignUpData to use isRegisterFormComplete.

• Connected the login email and password fields so the sign-in button updates as the user types.

• Updated Google and GitHub sign-in flows to disable/re-enable the sign-in button instead of the sign-up button.

• Updated the regular login flow to use the new sign-in form data and button logic.

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[fehmer]

hi @AzureNightlock , thank you for your contribution.

We are currently migrating the login page to solidjs #7595 and #7605

[AzureNightlock]

Ahh, Thanks for the heads up! Once the SolidJS login migration is ready, I'd be happy to reapply the same behavior if that would still be helpful?