fix: correct empty string escaping and path tildeification edge cases

[akramcodez]

The tildeifyPath function incorrectly replaced paths starting with the home directory string but not actually subdirectories of it.

Before:

// Home: /home/akram
tildeifyPath('/home/akram-dev/file.txt') // Returns: '~/dev/file.txt' (wrong)

After:

// Home: /home/akram
tildeifyPath('/home/akram-dev/file.txt') // Returns: '/home/akram-dev/file.txt' (correct)

Changes

• Check for exact home directory match first
• Use path.sep for proper directory boundary detection
• Only replace when path is actually under home directory

Testing

Verified with test scripts confirming the fix handles edge cases with similarly-named directories correctly.