feat(Desktop): add missing TUI themes to desktop app

[AnubhavPurohit691]

Summary

Adds the missing TUI themes to the desktop application so that both interfaces
offer the same set of theme options.

Changes

• Added existing TUI theme definitions to the desktop theme list
• Reused current theme tokens without modifying defaults or logic
• Ensured backward compatibility with existing desktop themes

Related issue

Fixes #10289

[github-actions]

Hey! Your PR title feat[Desktop]: add missing TUI themes to desktop app 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.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

No duplicate PRs found

[AnubhavPurohit691]

##DEMO
https://github.com/user-attachments/assets/89ab78be-9caf-46c1-af45-b2273a94c2ef

[AnubhavPurohit691]

@adamdotdevin can you please review it.