Fix whitespace in HTML emails by removing unnecessary whitespace class

[orvad]

Summary

• Removed whitespace-pre-wrap from the HTML message content container in MessageBubble.vue, which was causing incorrect whitespace rendering in HTML emails (e.g., excessive line breaks or collapsed layouts)
• HTML emails already define their own whitespace handling via inline styles; the Tailwind whitespace-pre-wrap class was overriding that and producing visual artifacts

Test plan

• Open a conversation containing an HTML email and verify whitespace renders correctly
• Verify plain text messages still display with proper line breaks
• Check emails with mixed content (attachments + HTML body) for correct spacing

[abhinavxd]

Hey, thanks for the PR! I will merge this as soon as I merge - #114

#114 PR adds the live chat widget, which required me to refactor and move many parts of the project. Since everything would need to be retested anyway, I ended up bundling in a lot of other fixes as well to avoid multiple rounds of QA.

[abhinavxd]

Hey there's a merge conflict due to recent merge