Extract useChat Hook

[soomtochukwu]

Description

The logic managing chat messages, typing state, and sending mock responses is intertwined with the UI in page.tsx.

Requirements

• Create src/hooks/useChat.ts.
• Move messages, isTyping, inputState and handleSendMessage into this hook.
• Return necessary state and handlers to be consumed by ChatInterface.tsx.

Acceptance Criteria

• The hook successfully manages the entire chat lifecycle.
• UI components are purely responsible for rendering the provided state.

[barry01-hash]

@barry01-hash has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I would love to work on this issues

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