Introduces a plugin architecture, including a PluginManager, plugin loading in main and renderer processes, and a sample plugin demonstrating menu, IPC, and context menu contributions. Adds a Plugins tab to the settings UI for managing plugins (enable/disable, reload), and updates preload.js to load renderer preloads from plugins. Documentation for plugin development is included in README-PLUGINS.md.
Moved site and search history management from the main process to the renderer for better performance and reliability. Updated settings UI to use a sidebar tab layout with improved accessibility and responsive design. Refactored tab rendering in the browser to use efficient scheduling and added a robust tab label function. Cleaned up context menu code and improved async file operations for bookmarks and history.
Added support for a dynamic 'Custom' theme button that appears when user settings diverge from predefined themes. Improved theme state management by tracking the active theme name in localStorage, updating button states, and refining the preview to better reflect customizations. Also updated the settings page layout and styles for better user experience and fixed the preview to always show the custom title.
andrew