feat(i18n): translate src/content/learn/sharing-state-between-components.md from English to Vietnamese

[KotonoSora]

🇻🇳 Vietnamese Translation: Sharing State Between Components

Hi! I'm contributing as a volunteer translator for vi.react.dev, and this PR adds the Vietnamese translation for the "Sharing State Between Components" lesson.

What's included

• Vietnamese translation of sharing-state-between-components.md
• Preserved all code examples and markdown formatting
• Kept terminology consistent with existing translations

Changes

• ✅ Fully translated the guide covering React state lifting and component coordination
• ✅ 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:
"Sharing State Between Components" → "Chia Sẻ State Giữa Các Component"

Các phần chính:

• "Lifting state up by example" → "Lifting state up bằng ví dụ"
• "Step 1: Remove state from the child components" → "Bước 1: Loại bỏ state khỏi các component con"
• "Step 2: Pass hardcoded data from the common parent" → "Bước 2: Truyền dữ liệu cứng từ parent chung"
• "Step 3: Add state to the common parent" → "Bước 3: Thêm state vào parent chung"
• "Controlled and uncontrolled components" → "Controlled và uncontrolled component"
• "A single source of truth for each state" → "Một nguồn chân lý duy nhất cho mỗi state"

Phần Challenges:

• "Synced inputs" → "Input đồng bộ"
• "Filtering a list" → "Lọc danh sách"

Các khái niệm kỹ thuật được giữ nguyên:

• "lifting state up", "props", "parent", "state", "component" được giữ nguyên hoặc dịch phù hợp với context

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