Introduce default-browser integration and external open handling across platforms. Added platform/default_browser.h with a Windows implementation (registry registration + settings UI invocation) and mac/linux stubs. Exposed new commands from the renderer (check-default-browser / set-default-browser) and implemented request/response plumbing in NebulaController (SendDefaultBrowserResult) and BrowserClient. Added UI controls and JS helpers in settings and setup pages to check and prompt the user to make Nebula the default browser.
Also added single-instance launch target handling: command-line URL normalization, passing/consolidating the launch target, forwarding it to an existing window on Windows via WM_COPYDATA, and exposing OnExternalOpenRequested on the window/controller. Implemented delayed navigation (CefTask) to safely load pending initial URLs after CEF initialization. Updated CMakeLists and platform startup signatures to include and accept the new files/parameters.
Track menu popup visibility and propagate zoom level to the popup. Add menu_popup_visible_ flag, SendMenuPopupZoom(), and call it when creating/showing the popup and when adjusting zoom. Make CreateNewTab accept an optional URL and route popup/new-tab flows to it. Prevent per-tab child closes from triggering app shutdown by tracking closing_tab_browsers_ and adding ForgetClosingTabBrowser(). Treat MenuPopup role specially when enabling frame hit-testing.
Platform: remove usage of ApplyRoundedBrowserRegion and switch menu popup sizing to use resized client_size helpers (consolidate calculations across Win/Mac/Linux). UI: update menu-popup CSS/JS (new styling, font, zoom formatting API via NebulaMenuPopup.setZoomLevel), wire settings to use nebulaNative.postMessage for new-tab, and remove the static menu-popup.html. Misc: small chrome CSS/JS tweaks and ensure chrome state includes zoomLevel.
Add persistent site history storage and plumbing between the renderer settings UI and the native app. The app now loads/saves site_history.txt in the user data directory (max 200 entries, http/https-only, stored one URL per line) and records visited sites on navigation. Settings pages receive the history via injected JavaScript when the settings page finishes loading, and a "clear-site-history" message from the settings UI clears the on-disk history and updates the renderer.
Other changes: allow settings-related process messages from content frames in the CEF client, introduce OnContentLoadFinished to trigger history injection, expose electronAPI.send/sendToHost (and reuse the native postMessage handler) in the V8 context, and remove the BigPicture in-app history UI/refresh/clear handlers (history is now managed by the native app). Also cleaned up includes and added helper utilities for JSON escaping, lowercasing, and file path handling. The initial tab restore logic was simplified to always create an initial tab (home or initial_url) and persist the session.
Add initial Nebula Browser project skeleton: CMakeLists to configure and link CEF (including post-build steps to copy runtime and UI files), a Windows CEF-based entry (app/main.cpp) that initializes CEF and loads the bundled UI, and a full ui/ and assets/ tree (HTML, CSS, JS, fonts, icons, and branding images). Update .gitignore to ignore build/out, thirdparty/cef, IDE and common OS artifacts.
Andrew Zambazos
andrew