💄 Update milestones section display logic

Refine the conditions for displaying milestones to enhance clarity and ensure all milestones are shown when available. ✨ Enhance milestone achievements and styles Update milestone achievements to include tier information and improve styling for both reached and upcoming milestones in the book comparison view. ✨ Add search functionality to journal entries Implement search input and loading indicators for filtering entries. Enhance UI to display relevant messages based on search results. 💄 Improve calendar day rendering logic Enhance the conditional checks for calendar days to ensure proper handling of adjacent months and event properties. 💄 Enhance email box functionality and interaction Implement clipboard functionality for email copying and improve UI elements. 💄 Enhance email box UI and interaction Revamp the email box layout with improved styling and add visual feedback for the copy email button. 💄 Enhance email box UI and copy functionality Improve layout and styling of the email box, and add visual feedback for the copy button to enhance user experience. 💄 Simplify focus styles for tab buttons Remove unnecessary focus ring styles for a cleaner UI in the authors index. 💄 Update export and import section descriptions Reintroduce helpful descriptions for data export and import sections to enhance user understanding.