feat(i18n): src/content/learn/separating-events-from-effects.md from English to Vietnamese

[KotonoSora]

🇻🇳 Vietnamese Translation: Separating Events from Effects

Hi! I'm contributing as a volunteer translator for vi.react.dev, and this PR adds the Vietnamese translation for the "Separating Events from Effects" lesson.

What's included

• Vietnamese translation of separating-events-from-effects.md
• Preserved all code examples and markdown formatting
• Kept terminology consistent with existing translations

Changes

• ✅ Fully translated the guide covering the separation between event handlers and Effects in React
• ✅ Maintained code blocks, links, Sandpack components and Challenge/Solution sections
• ✅ Verified all internal links and formatting render correctly

Looking forward to contributing more translations to the project! 🚀

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Tóm tắt những gì đã được dịch:

Tiêu đề và phần Intro:
"Separating Events from Effects" → "Tách biệt sự kiện và Effect"

Các phần chính:

• "Choosing between event handlers and Effects" → "Lựa chọn giữa event handler và Effect"
• "Reactive values and reactive logic" → "Giá trị reactive và logic reactive"
• "Extracting non-reactive logic from Effects" → "Tách logic không reactive ra khỏi Effect"
• "Declaring an Effect Event" → "Khai báo một Effect Event"
• "Reading latest props and state with Effect Events" → "Đọc props và state mới nhất với Effect Event"
• "Limitations of Effect Events" → "Giới hạn của Effect Event"

Phần Challenges:

• "Fix a connection reset bug" → "Sửa lỗi reset kết nối"
• "Fix a retriggering animation" → "Sửa lỗi animation kích hoạt lại"
• "Fix a delayed notification" → "Sửa lỗi thông báo bị trễ"

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Name	Status	Preview	Comments	Updated (UTC)
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