fix: resolve broken message insertion logic

[deepak0x]

This PR fixes incorrect message insertion behavior and removes inconsistencies in how messages are stored and rendered across the application.

Closes #1082

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Solution

This PR standardizes message storage across the application by using a single, consistent order:

Ascending order (Oldest → Newest) everywhere.

Key Changes

• Updated insertMessage
  The insertion logic now supports ascending lists by finding the correct index where the next message is newer:

  new Date(m.ts) > new Date(message.ts)
  

• Updated messageStore
  The setMessages action now reverses the server response (which is descending by default) before storing it, ensuring all messages in the store are ascending.