[Feature]: Improve CLI output with colors and spinner

[Holidayrabbit]

Problem Statement

Currently, the CLI uses plain console.log for all output, making it difficult to:

• Distinguish between different types of messages (info, success, error, warning)
• Know when a long-running operation is in progress
• Quickly scan the terminal output for important information

Proposed Solution

Add colored output and spinners using lightweight, well-maintained libraries:

• picocolors - Zero-dependency, performant terminal colors (~3.5x faster than chalk)
• ora - Elegant terminal spinner

Alternatives Considered

No response

Component

None

Impact

• Breaking change (requires migration)
• Performance improvement
• Developer experience
• User experience
• Security enhancement
• Documentation update needed

Additional Context

No response