feat(i18n): add Arabic font support

[abaza738]

Added a font for Arabic language because the current font does not support Arabic letters (and I guess many other languages?)😅.
Tested this locally and found it to preserve the original font Geist when English text is written in the middle of Arabic text, I suppose this is unicode-range working properly.

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Project	Deployment	Actions	Updated (UTC)
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Project	Deployment	Actions	Updated (UTC)
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The change adds "IBM Plex Sans Arabic" to font stacks and configuration only. In lunaria/styles.ts the root CSS variables --ln-font-body and --ln-font-mono are extended to include "IBM Plex Sans Arabic". nuxt.config.ts gains a fonts.families entry for "IBM Plex Sans Arabic" with weights 400, 500, 600, global rendering enabled and the Arabic subset. uno.config.ts updates theme.font.mono and theme.font.sans to include "IBM Plex Sans Arabic". No other logic was changed.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description check	✅ Passed	The pull request description accurately describes the changeset, which adds Arabic font support (IBM Plex Sans Arabic) across three configuration files to enable proper rendering of Arabic text.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[ghostdevv]

Could you show some screenshots of before/after? @abaza738