Email changes

[teelur]

• Update email sender to use non-depricated API
• Send email when account gets locked out
• Add a button to resend the confirmation email for unverified accounts
• Update the registered message to not include the email part when not configured

[Copilot]

Pull request overview

This PR modernizes the email-sending implementation and expands Identity flows to better support email confirmation and lockout notifications, with corresponding frontend UX updates and dependency bumps.

Changes:

• Replace legacy SMTP email sending with MailKit/MimeKit and add localized configuration error strings.
• Extend Identity endpoints to return a richer /register response, send an email on lockout, and support resending confirmation emails; update the client to consume these behaviors.
• Update client translations and bump several server/test package references.

Reviewed changes

Copilot reviewed 17 out of 18 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
server/BudgetBoard.WebAPI/Utils/Helpers.cs	Fix proto detection to use request.Scheme (with forwarded header fallback).
server/BudgetBoard.WebAPI/Utils/EmailSender.cs	Switch SMTP implementation to MailKit/MimeKit and localize config errors.
server/BudgetBoard.WebAPI/Resources/ApiResponseStrings.resx	Add localized strings for email config errors and lockout email subject/body.
server/BudgetBoard.WebAPI/Overrides/RegisterResponse.cs	Add a typed register response contract for the API.
server/BudgetBoard.WebAPI/Overrides/IdentityApiEndpointRouteBuilderExtensions.cs	Customize register/login behavior; add lockout email send and new error details.
server/BudgetBoard.WebAPI/BudgetBoard.WebAPI.csproj	Bump packages and add MailKit dependency.
server/BudgetBoard.Tests/BudgetBoard.IntegrationTests.csproj	Update EF InMemory + coverlet.collector package versions.
server/BudgetBoard.Service/Resources/LogStrings.resx	Remove a log string entry (currently still referenced).
server/BudgetBoard.Service/BudgetBoard.Service.csproj	Bump Microsoft.Extensions.* package versions.
server/BudgetBoard.Database/BudgetBoard.Database.csproj	Bump EF Core/Identity/config package versions.
client/src/models/auth.ts	Add RegisterResponse interface matching the new API response.
client/src/app/Unauthorized/Register/Register.tsx	Use new register response to tailor “account created” messaging.
client/src/app/Unauthorized/Login/Login.tsx	Add “resend confirmation email” button and handle new server error details.
client/public/locales/fr/translation.json	Add updated “account created” keys (locale also needs new resend keys).
client/public/locales/en-us/translation.json	Add new keys for account-created messaging, resend button, and resend notifications.
client/public/locales/de/translation.json	Add updated “account created” keys (locale also needs new resend keys).

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