feat: add absolute deadline column to today and tomorrow commands

[Copilot]

Plan: Address PR Review Comments

• Cache FormatDueDate and FormatAbsoluteDeadline calls to avoid redundant formatting
• Add test cases for overdue goals (past dates/times)
• Add test cases for year boundary edge cases (Dec 31 -> tomorrow)

Summary

All review comments have been addressed:

1. Cached formatting calls - Pre-calculate formatted values to avoid calling FormatDueDate twice per goal
2. Added overdue test cases - Tests for goals overdue by hours, days, and weeks
3. Added year boundary test cases - Tests for Dec 31 -> Jan 1 transitions and cross-year scenarios

All tests pass (17 new test cases added).

Original prompt

Currently buzz today and tomrrow commands output a relative deadline column. Let's add an absolute deadline column too.

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[coderabbitai]

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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-198-latest buzz-pr-198

# Run the pre-release
buzz-pr-198

# Uninstall the pre-release
bin remove buzz-pr-198

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🗑️ This pre-release will be automatically deleted when the PR is closed.

[Copilot]

Pull request overview

This PR enhances the buzz today and buzz tomorrow commands by adding an absolute deadline column alongside the existing relative deadline, making it easier for users to see both how much time remains and the exact date/time when goals are due.

Key changes:

• Added FormatAbsoluteDeadline() function with context-aware formatting (time-only for today, "tomorrow" prefix for tomorrow, date+time for future dates)
• Updated handleFilteredCommand() to calculate and display a fourth column with proper alignment
• Added comprehensive test coverage for the new formatting function

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
beeminder.go	Implements FormatAbsoluteDeadline() and FormatAbsoluteDeadlineAt() functions with timezone-aware date/time formatting logic
beeminder_test.go	Adds TestFormatAbsoluteDeadline with test cases covering today, tomorrow, and future date formatting scenarios
main.go	Updates handleFilteredCommand() to calculate column width for relative deadlines and add absolute deadline as fourth column
README.md	Updates documentation and examples to show the new absolute deadline column in command outputs

[narthur]

@copilot apply changes based on the comments in this thread