fix(ui): adjust user message bubble styling for multiline code and proper alignment

[rickychen-infinirc]

Summary

Fixes message bubble styling issue for user messages containing multi-line code or long text.

Changes

• Replaced break-words with whitespace-pre-wrap to correctly render line breaks.
• Removed text-right to align multi-line code properly.
• Kept rounded-2xl and padding for consistent bubble style.

Before

Long code blocks were right-aligned and displayed as a single line.

After

Code and text now preserve line breaks and align naturally.

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