feat: ✨ support left align for titles

[Equationzhao]

• test: ✅ add test in main_test
• feat: ✨ support left align for titles

tests

some tests will fail because of the new title alignment.

Failed: tests/footer.sh
30c30
< Permissions     Size        Owner Group Name
---
> Permissions Size     Owner        Group Name

Failed: tests/header-footer.sh
1c1
< Permissions     Size        Owner Group Name
---
> Permissions Size     Owner        Group Name
31c31
< Permissions     Size        Owner Group Name
---
> Permissions Size     Owner        Group Name

Failed: tests/header.sh
1c1
< Permissions     Size        Owner Group Name
---
> Permissions Size     Owner        Group Name