patch(am): fix ethiopian date in amharic date translator

[pythonbrad]

Change

• improve the Amharic date translator in fixing the Ethiopian year

Additional changes

• add more format like the Gregorian ones.

Summary by CodeRabbit

• New Features

  • Added Ethiopian calendar date conversion based on Gregorian dates.
  • Supports date inputs separated by slashes, dots, or hyphens.
  • Added English and Amharic Gregorian month formats, Ethiopian dates, and ISO-formatted output.
  • Added support for two-digit years and Gregorian leap years.

• Bug Fixes

  • Improved date validation for invalid formats, months, days, and leap-year boundaries.
  • Invalid dates now return no results instead of incomplete translations.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 80e0a6cb-092c-4e46-97ca-b992d1fded3b

📥 Commits

Reviewing files that changed from the base of the PR and between 8d60acb and 6328521.

📒 Files selected for processing (1)

• am/scripts/datetime/date.rhai

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📝 Walkthrough

Walkthrough

The date script now parses multiple date separators, validates Gregorian dates, converts them to Ethiopian dates through JDN, and returns expanded Ethiopian, Gregorian, Amharic, and ISO formatted candidates.

Changes

Date translation

Layer / File(s)	Summary
Calendar conversion and parsing am/scripts/datetime/date.rhai	Adds Ethiopian and Gregorian month data, leap-year and month-length validation, Gregorian-to-JDN conversion, JDN-to-Ethiopian mapping, and support for /, ., and - separators.
Validated translation outputs am/scripts/datetime/date.rhai	Validates parsed values, expands two-digit years to 2000–2099, and emits Ethiopian, Amharic, English Gregorian, and zero-padded ISO candidates.

Estimated code review effort: 3 (Moderate) | ~20 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly reflects the main change: fixing Ethiopian date handling in the Amharic date translator.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch patch_am_date

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