Fix programs command table formatting and improve output readability

[musaprg]

Summary

• Fixed programs current command showing Go struct internals instead of readable program data
• Improved table formatter to handle complex nested data structures properly
• Added custom formatting for schedule data with channel information

Key Changes

Programs Command Improvements

• Custom Schedule Formatting: Added formatSchedulesAsTable() function that flattens nested schedule data into readable table format
• Time Display: Added formatUnixTime() helper to convert Unix timestamps to HH:MM format for better readability
• Description Handling: Truncate long program descriptions to 50 characters for clean table display
• Channel Information: Include channel name and type alongside program details

Table Formatter Enhancements

• Nested Struct Handling: Improved handling of complex data structures to show type names instead of memory addresses
• Clean Output: Avoid displaying Go's internal struct representations in table format
• Consistent Formatting: Ensure all data types display appropriately in table format

Testing

✅ Tested Commands:

• programs current - Now displays clean table with channel names, program names, times, and descriptions
• programs search - Works correctly with improved formatting
• channels list/show - Continues to work properly
• recordings list/status - Functions correctly
• JSON Output - Unchanged and works for all commands for automation scripts

✅ Test Server: Verified against EPGStation server at http://popplio.foxhound-kelvin.ts.net:8888

Related Tasks

Addresses output formatting issues identified during comprehensive CLI testing. Maintains backward compatibility while significantly improving user experience.

Other

• No breaking changes to API or command interface
• JSON output preserved for automation compatibility
• All existing flags and options continue to work