Add Persian (fa) locale support

[ali-master]

Summary

This PR adds Persian (fa) locale support to Chrono, enabling natural language date/time parsing for Persian speakers.

Changes

• Locale implementation: Created fa.casual configuration with Persian date/time expressions
• Casual expressions: Support for common phrases:
  • Relative dates: "الان", "امروز", "فردا", "دیروز"
  • Time-of-day anchors: "صبح" (06:00), "ظهر" (12:00), "عصر" (18:00)
• Tests: Added comprehensive unit tests in test/fa/fa_casual.test.ts
• Exports: Exposed fa locale from root export

Other Changes:

• Upgraded dependencies to their latest versions
• update Jest scripts for cross-platform compatibility
• Moved the Eslint configuration to the eslint.config.js file

Testing

Run Persian locale tests:

npm run test:silent -- test/fa/*.ts --no-coverage

Usage

import * as chrono from 'chrono-node';

chrono.fa.casual.parse('امروز صبح');
// Returns parsed result for "today morning"

Notes

• No breaking changes; purely additive
• Follows existing locale patterns for consistency
• Future improvements could include Persian digits, weekday/month names, and relative units

[Copilot]

Pull Request Overview

Adds comprehensive Persian (fa) locale support to Chrono, including parsers/refiners, exports, and extensive tests. Also updates timezone handling for IRST and modernizes tooling/config.

• New fa locale: Parsers for weekdays, ranges, time units (ago/within/later), month names (SH and Gregorian), casual phrases, and refiners for merging and strict mode.
• Tests: Extensive unit tests covering Persian expressions, edge cases, and negative cases; minor Jest matcher update.
• Tooling/Docs: Export fa in root, README updates, eslint flat config, and Jest/TS deps bump.

Reviewed Changes

Copilot reviewed 37 out of 38 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
src/locales/fa/**	New Persian locale implementation (parsers/refiners/constants/config).
test/fa/**	New test suites validating Persian parsing behaviors and edge cases.
src/index.ts	Exports fa locale.
README.md	Documents fa as supported locale and usage example.
src/timezone.ts	Changes IRST to DST-aware mapping.
src/results.ts	Minor const refactor in relative date creation.
test/debugging.test.ts	Updates deprecated Jest matchers.
package.json	Bumps Jest/TS/Eslint deps; sets TZ=UTC in scripts; moves eslint config to flat file.
eslint.config.js	Introduces ESLint Flat Config.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[ali-master]

Any updates?

@wanasit