feat: Build Secure Tunnel UI (Chat Screen)

[ayush00git]

Task

Build the main chat interface that renders messages passing through the P2P data channel.

Requirements

• Create a clean, light-themed chat view.
• Implement flat chat bubbles.
• Add a simple, flat text input at the bottom for composing messages.
• Add a subtle 'Encrypted & P2P' status indicator at the top.
• Wire the UI to pull and display real-time message data from WatermelonDB.
• Styling Rule: Solid accent colors only, zero gradients.