Custom UI Modals: Replaced all native browser pop-ups (alert(), confirm(), prompt()) with clean, built-in modal dialogs matching the extension's dark theme.

Visual Emoji Selector: Added an interactive emoji picker grid to the category creation and rename modal, complete with custom emoji input support.

Category Update: Replaced the default "HTML" category with a new "Source Code" category.

UI & Experience Improvements: Disabled text selection and right-click context menus inside the panel for a smoother, app-like feel, alongside updated icons and refined typography.