Issue #1 - [BUG] Empty messages sent with whitespace characters

[zenocross]

Description

Users can currently send messages containing only whitespace characters (spaces, tabs, newlines), which creates empty-looking messages in the chat.

Current Behavior

• Messages with only whitespace are accepted
• Empty-looking messages appear in chat history
• Wastes space and degrades chat experience

Expected Behavior

Input should be trimmed before validation, preventing submission of whitespace-only messages.

Steps to Reproduce

1. Open chat input
2. Type multiple spaces or press spacebar/tab repeatedly
3. Press send
4. Empty message appears in chat

Proposed Solution

Trim input message using .trim() before checking if it's empty.

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