Improve error handling and fix typo in cd command implementation

[coderabbitai]

Description

The cd command implementation for absolute paths needs improved error handling and has a typo that should be addressed.

Issues to Address

1. Missing error message: When a path doesn't exist or isn't a directory, no error message is printed to the user
2. Typo: There's a "or or" typo that should be corrected to "or"
3. Misleading error message: When set_current_dir fails after confirming the path exists and is a directory, the error message may be misleading (likely a permissions issue rather than path not found)

Context

This issue was identified during code review of PR #11 which implements cd navigation for absolute paths.

Backlinks:

• PR: feat(cd): implement cd navigation for absolute paths #11
• Review comment: feat(cd): implement cd navigation for absolute paths #11 (comment)
• Requested by: @Pawank06

Affected File

src/main.rs - the cd command handling branch for absolute paths