feat: Add Persian (Farsi) locale support #157

Persian (Farsi) is spoken by millions of users worldwide. Adding Persian locale support will make the application accessible to Persian-speaking developers and enhance the platform's global reach.

Overview

Persian (Farsi) will be added as a new supported locale with the language code fa. Like Arabic, Persian is written right-to-left (RTL), so proper RTL support must be ensured throughout the application.

Tasks

• Create a new locale file locales/fa.json with all translation keys from locales/en.json translated to Persian.
• Update lib/i18n-core.ts to add fa to the supportedLocales array.
• Add Persian entry to the localeMeta object in lib/i18n-core.ts with the following configuration:

  fa: { dir: "rtl", label: "فارسی" }

• Test the language switcher to ensure Persian appears in the dropdown menu.
• Verify RTL layout is applied correctly across all components (using the existing dir property mechanism).
• Test the application with Persian locale selected to ensure all UI elements display correctly.

Translation Keys

All translation keys from the existing English locale must be translated. The keys include:

• Application titles and subtitles
• Error messages
• UI labels and buttons
• Explanations and descriptions
• Comparison metrics
• Community contribution labels
• And more (reference locales/en.json for the complete list)

RTL Considerations

• Ensure the application respects the dir: "rtl" setting for proper layout direction.
• Test that text alignment, spacing, and component positioning work correctly in RTL mode.
• Verify that language-sensitive components (like tables, charts, and forms) display correctly in RTL.

Testing

• Language switcher displays "فارسی" correctly.
• All pages render without errors when Persian is selected.
• RTL layout is applied properly across all components.
• No layout shifts or broken styling in RTL mode.