Improved Presentation Processing and Faster Account Menu

🔄 Improvements

• Improved handling of presentation PDFs, including support for encrypted files during slide extraction
• Faster account menu loading by loading content only when the menu is opened
• Improved reliability of attachment synchronization and thumbnail management across devices

🛠 Fixes

• Fixed: Presentation slide extraction could fail when PDFs were stored in encrypted format
• Fixed: Broken thumbnail synchronization paths that could cause missing or duplicated attachment previews
• Fixed: "What's New" notification badges now clear correctly after viewing announcements

And other improvements