Introduces a full browser customization system with support for theme presets, live editing, import/export, and non-destructive design. Adds new documentation for customization, updates the features list, and implements a ThemeManager for loading and managing themes at the application level. Updates home and settings pages to support live theming and preview, and adds four built-in themes (default, forest, ocean, sunset).
Site history is now managed in localStorage for faster access and better cross-tab experience, with file sync for persistence. Added a dropdown for quick site history access in the address bar, updated settings page to display and manage site history from localStorage, and improved history recording logic in both main and renderer processes. Also added debug info and test data utilities for development.
andrew