feat: add new chat dialog in chats page

[AliAkrem]

Description

Implements a "new message creation" feature in the chat interface that allows users to initiate new conversations directly from the inbox page. This PR adds a modal-based interface for searching and selecting message recipients, improving the overall user experience by eliminating the need to navigate away from the main chat view.

Types of changes

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Others (any other types not listed above)

Checklist

• I have read the Contributing Guide

Further comments

Screencast.from.2025-01-31.12-28-41.webm

Related Issue

Closes: #89

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[satnaing]

Thanks for your PR @AliAkrem

I've made some improvements/changes as well. Here's the summary

• update user extracting logic
• extract common types into a chat-types.ts file
• move CreateConversationModal.tsx under features/chat/components because this component is only being used inside chat feature.
• rename CreateConversationModal.tsx to new-chat.tsx
• fix text color in input (invisiable text in light mode initially)