fix: Respect platform directory conventions

[yousshim]

fixes #8235

xdg-basedir respects only the linux xdg standard. This commit replaces it with env-paths which respects the conventions on mac os and windows

What does this PR do?

Replaces "xdg-basedir" with "env-paths" which respects platform specific directory conventions.

How did you verify your code works?

Compiled and ran on windows and verified connecting to a provider stored the "auth.json" in the correct directory.

[github-actions[bot]]

Hey! Your PR title [FIX] Respect platform directory conventions 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[bot]]

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

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