feat: add buzz due command with duration parsing

[Copilot]

• Add duration parsing function to support formats like 1h, 5d, 1w
• Add IsDueWithin function to check if a goal is due within a given duration
• Add tests for duration parsing function
• Add tests for IsDueWithin function
• Add handleDueCommand function to handle the new command
• Update main.go to route 'due' command to handler
• Update help text to document the new command
• Update README.md with documentation for the new command
• Address code review feedback:
  • Added validation to reject negative durations
  • Added overflow protection for very large durations
  • Added tests for negative durations (-1h, -5d, -1w)
  • Added tests for zero durations (0h, 0d, 0w)
  • Added tests for very large durations (overflow scenarios)
  • Fixed indentation inconsistency in test case
  • Updated README to clarify overdue goals are included
• All tests passing (25 test cases for ParseDuration)
• Security scan passed

Original prompt

Add new command, buzz due <duration>, that accepts a duration and then lists goals that are due within that duration like buzz today or buzz tomorrow. Examples: buzz due 1h, buzz due 5d, buzz due 1w, etc.

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[github-actions]

🚀 Pre-release Build Ready

Test builds are ready! Install directly using the bin command:

# Install the pre-release
bin install https://github.com/PinePeakDigital/buzz/releases/tag/pr-201-latest buzz-pr-201

# Run the pre-release
buzz-pr-201

# Uninstall the pre-release
bin remove buzz-pr-201

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[Copilot]

Pull request overview

This PR adds a new buzz due <duration> command that allows users to list goals due within a custom time window, extending the existing fixed today and tomorrow commands with flexible duration parsing.

Key changes:

• Implements duration parsing supporting hours, days, and weeks with decimal values (e.g., 1h, 5d, 1.5w)
• Adds filtering logic to show goals due within the specified timeframe
• Includes comprehensive test coverage with 23 test cases across parsing and filtering functions

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
main.go	Adds handleDueCommand() function with argument validation and integrates it into command routing; updates help text to include the new command
beeminder.go	Implements ParseDuration() for parsing duration strings, IsDueWithin() and IsDueWithinAt() for filtering goals by deadline
beeminder_test.go	Adds comprehensive test coverage for ParseDuration (15 test cases) and IsDueWithin (8 test cases) functions
README.md	Documents the new command with examples, supported duration units, and usage patterns

[narthur]

@copilot apply changes based on the comments in this thread

[Copilot]

@copilot apply changes based on the comments in this thread

All review comments have been addressed in commit 0a37a93:

1. ✅ Added validation to reject negative durations
2. ✅ Added test coverage for negative durations (-1h, -5d, -1w)
3. ✅ Added test coverage for zero durations (0h, 0d, 0w) - accepted as valid
4. ✅ Added test coverage for very large durations with overflow protection
5. ✅ Fixed indentation inconsistency (tabs → spaces)
6. ✅ Updated README to clarify overdue goals are included

All 25 test cases pass and the command properly rejects invalid inputs.