Fixed Grok HTML export alignment: user right, assistant left with correct icons.

In the new version 0.5.7, we have;
1) Added advanced export options for PDF/DOCX: page size/orientation/margins, theme (light/dark), font & size selector, user info (name/email/date) in header, page-break-per-prompt, TOC, and branding/icon toggles.
2) Improved layouts: user/assistant alignment, better bubbles, dark-mode backgrounds (PDF/HTML/DOCX), clickable TOC entries, header title/filename obey overrides, emoji font support.
HTML export polished to mirror chat themes; DOCX respects theme, fonts, and sizing.
3) Sharing & UX: post-export modal with links/share buttons, dynamic share message, uninstall survey link, link-generation quotas (3/day, 7/week).
4) Stability fixes: CSP-safe icons, font loading fixes, error handling for link generation.

❤️ Changelog:
v0.5.6
i. Added full Firefox support for AI Chat Exporter Pro.
ii. Improved Markdown exports so code blocks from Claude and other providers are preserved and formatted correctly.
iii. Fixed minor issues with sharing limits and in‑page support prompts.
Internal compatibility updates to pass the latest Firefox add‑on review requirements.