[FEATURE] Add report reason options

[Arnav-Agrawal-987]

💡 What's your idea?

Allow users to choose reasons for reporting a message and send the reason along with the message report.

🤔 Why would this be useful?

Allows moderators to specifically narrow down the rule violation for the message (if any).

🎯 Where should this feature go?

• 🌐 Website (React web client)
• 📱 Mobile app (Flutter mobile client)
• 🔧 Core Protocol (Go - main LIBR logic)
• 🌐 Network Layer (Go - P2P networking)
• 🔗 Smart contracts (Blockchain)
• 📚 Documentation
• 🛠️ Development tools

🖼️ How should it look/work?

On clicking the report option, a pop up box should appear with 4-5 common reasons and a custom text field for other reasons.

🌟 How important is this feature?

• 🔥 Critical - I really need this to use the app
• 🎯 High - This would make the app much better
• 😊 Medium - This would be nice to have
• 🤷 Low - Just a small improvement

📚 Examples

User flow would be similar to the return a product on any E-commerce platform

🔧 Implementation Ideas (Optional)

📱💻 Additional Context

No backend modifications required. Only frontend code needed.

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