[FEATURE] Chat Conversation Screen

[celestix]

This issue tracks the implementation of the Chat Conversation Screen in the WhatsApp Linux desktop client.
The conversation screen is shown when a user selects a chat from the chat list and is used for viewing and sending messages within a specific chat.

The screen should closely resemble the behavior and structure of WhatsApp Web/Desktop while remaining consistent with desktop UI patterns.

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📋 Requirements

• Display messages for the selected chat
• Support both individual and group chats
• Show for each message:
  • Message content
  • Sender name (for group chats)
  • Timestamp
  • Message direction (sent / received)
  • Message status (sending, sent, delivered, read)
• Clearly separate sent and received messages
• Maintain correct chronological order
• Auto-scroll to the latest message when the chat is opened
• Update the conversation view in real time when new messages arrive

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🧩 Supported Message Types

The conversation screen should support rendering the following WhatsApp message types:

• Text messages
• Images
• Videos
• Audio / voice notes
• Documents (PDF, ZIP, etc.)
• Stickers
• GIFs
• Location messages
  • Live location
  • Static location
• Contact cards
• Reply messages (quoted messages)
• Forwarded messages
• Reactions (emoji reactions)
• Message edits
• Message deletions
  • Delete for me
  • Delete for everyone
• System messages
  • Group creation
  • Member join/leave
  • Admin changes
• Call-related messages
  • Missed call
  • Voice call
  • Video call

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✅ Acceptance Criteria

• Conversation screen opens immediately after selecting a chat
• All supported message types render correctly
• Messages are displayed in correct chronological order
• Message status indicators update correctly
• New messages appear in real time without reload
• Works consistently for both personal and group chats