feat(utils): enhance ExpandTilde to support ~username

[AliyaRazyapova]

Description

This PR enhances the ExpandTilde function in the utils package to support expanding ~username paths (e.g., ~john/documents). Previously, only ~ (current user) was expanded correctly; ~username was ignored.

Changes

• Added support for ~username using os/user.Lookup().
• Fixed path splitting to handle both Unix (/) and Windows (\) separators.
• Improved error handling – if user lookup fails, the original path is returned (backward compatible).
• Added comprehensive unit tests covering:
  • ~ and ~/subpath
  • ~username/subpath (for existing user)
  • non-existing user (fallback to original path)
  • edge cases (empty string, tilde not at start)

Testing

• All tests pass
• Manual verification with various inputs.

Closes #115

[pashkov256]

Hi @AliyaRazyapova! The job failed because two files are not properly gofmt formatted:

internal/utils/utils.go
internal/utils/utils_test.go
Solution: Run gofmt on both files to automatically format them. In your project root, run:

gofmt -w internal/utils/utils.go internal/utils/utils_test.go

Run and commit the formatted files, and push your changes. This will resolve the lint (gofmt) errors and allow the CI job to pass.

[pashkov256]

Hi @AliyaRazyapova . Great solution, thanks for contributing to the repository!!
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