Enhancement: Improve Error Handling and User Messages

[Sapna700]

Description

Improve error handling throughout the application to provide clearer, more helpful error messages to users and handle edge cases gracefully.

Goals

• Add comprehensive error handling
• Provide helpful error messages
• Handle edge cases (empty input, invalid commands, etc.)
• Add logging for debugging
• Validate user inputs

Implementation Details

• Create custom exception classes for TaskPilot
• Add input validation
• Improve error messages in CLI
• Add logging module
• Handle OpenAI API errors gracefully
• Add try-except blocks for file operations

Example Improvements

• Current: Invalid task number.

• Better: Task #5 not found. You have 3 tasks. Please enter a number between 1 and 3.

• Current: Silent failure on OpenAI error

• Better: OpenAI API Error: Rate limit exceeded. Please try again in a few minutes.

Acceptance Criteria

• ✅ All user inputs are validated
• ✅ Error messages are clear and helpful
• ✅ API errors are caught and handled
• ✅ Logging is implemented
• ✅ Edge cases are handled
• ✅ Unit tests added for error handling
• ✅ Documentation updated

Tasks

• Create custom exception classes
• Add input validation
• Improve error messages in main.py
• Add logging configuration
• Handle OpenAI API errors
• Add error handling tests

Related Issues

Improves overall code quality