feat: add JSON to SQL INSERT converter

[Ayesha-shafi12]

📝 Description

Adds a new "JSON ⇄ SQL INSERT Converter" tool to the Dev Utilities Sandbox. It converts a JSON array of objects into a SQL INSERT INTO ... VALUES statement, and can also parse a supported INSERT INTO ... VALUES statement back into a JSON array. Runs entirely client-side — no external APIs or database connections.

Handles:

• Strings (with SQL quote escaping)
• Numbers and decimals
• Booleans (TRUE/FALSE)
• NULL values
• Multiple JSON rows / multiple SQL VALUES rows

Includes validation and clear error messages for invalid JSON, empty arrays, mismatched column/value counts, unclosed string literals, and invalid table/column names.

🔗 Related Issue

Closes #193

🎯 Type of Change

• feat: New feature

✅ Checklist

• Follows project's Monochrome design (Black/Grey/White) 🎨
• Follows Conventional Commits 📜
• Added screenshots (if UI was changed) 📸
• Tested locally on the latest version 🧪

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[github-actions]

👋 Hello, @Ayesha-shafi12!

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