feat: Avatar placeholder wastes unnecessary space

[sewnie]

Problem

Disable avatars to have a cleaner experience.

Proposed solution

Avatars are simply removed and the entire message view is shifted to the left as opposed to a placeholder.

Alternatives considered

No response

Additional context

No response

Confirmations

• I searched existing issues and discussions for the same idea.
• This request does not involve self-bot automation, mass actions, or scraping.