fix(opencode): expose and use auth confirmation code

[OpeOginni]

Issue for this PR

Closes #30541

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

When using Oauth Connection of any kind the Desktop UI shows Confirmation Code even if there isnt any passed or needed.

• This PR checks for if any code is given and if none is found doesnt render the Confirmation Code component.
• It also adds translations for the new text show when only broswer auth is used without a confirmation code.

How did you verify your code works?

• Passed Typecheck
• Tested For provider auth methods without codes and those with codes and does with code to make sure of no regression. (check video below)

Screenshots / recordings

Screen.Recording.2026-06-03.at.12.06.07.mov

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Hey! Your PR title fix(opencode + desktop): OAuth passes in code separate from instructions doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[OpeOginni]

NEW LOOK

Trimmed.mov

[OpeOginni]

@Hona any feedback on the changes?