Menu popup: visibility, zoom sync, and tab fixes

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.

src/platform/browser_host.h

@@ -14,7 +14,6 @@ void ResizeBrowserWindow(NativeWindow browser_window, const Rect& rect);
 void SetBrowserVisible(NativeWindow browser_window, bool visible);
 void RaiseBrowserWindow(NativeWindow browser_window);
 Rect MenuPopupRect(NativeWindow parent, const BrowserLayout& layout);
-void ApplyRoundedBrowserRegion(NativeWindow browser_window, int corner_radius);
 std::string CacheBusterToken();
 void DestroyTopLevelWindow(NativeWindow window);
 int ScaleForParentWindow(NativeWindow parent, int value);

src/platform/linux/browser_host_linux.cpp

@@ -45,26 +45,21 @@ std::pair<int, int> ParentClientSize(NativeWindow parent) {
 }
 
 Rect MenuPopupRect(NativeWindow parent, const BrowserLayout& layout) {
-    const auto [client_right, client_bottom] = ParentClientSize(parent);
+    const auto client_size = ParentClientSize(parent);
     const int width = 260;
     const int height = 258;
     const int margin = 12;
     const int overlap = 2;
-    const int x = std::max(0, client_right - width - margin);
+    const int x = std::max(0, client_size.first - width - margin);
     const int y = std::max(0, layout.chrome.y + layout.chrome.height - overlap);
     return {
         x,
         y,
-        std::min(client_right, x + width) - x,
-        std::min(client_bottom, y + height) - y,
+        std::min(client_size.first, x + width) - x,
+        std::min(client_size.second, y + height) - y,
     };
 }
 
-void ApplyRoundedBrowserRegion(NativeWindow browser_window, int corner_radius) {
-    UNREFERENCED_PARAMETER(browser_window);
-    UNREFERENCED_PARAMETER(corner_radius);
-}
-
 std::string CacheBusterToken() {
     return "0";
 }

src/platform/mac/browser_host_mac.cpp

@@ -43,26 +43,21 @@ std::pair<int, int> ParentClientSize(NativeWindow parent) {
 }
 
 Rect MenuPopupRect(NativeWindow parent, const BrowserLayout& layout) {
-    const auto [client_right, client_bottom] = ParentClientSize(parent);
+    const auto client_size = ParentClientSize(parent);
     const int width = 260;
     const int height = 258;
     const int margin = 12;
     const int overlap = 2;
-    const int x = std::max(0, client_right - width - margin);
+    const int x = std::max(0, client_size.first - width - margin);
     const int y = std::max(0, layout.chrome.y + layout.chrome.height - overlap);
     return {
         x,
         y,
-        std::min(client_right, x + width) - x,
-        std::min(client_bottom, y + height) - y,
+        std::min(client_size.first, x + width) - x,
+        std::min(client_size.second, y + height) - y,
     };
 }
 
-void ApplyRoundedBrowserRegion(NativeWindow browser_window, int corner_radius) {
-    UNREFERENCED_PARAMETER(browser_window);
-    UNREFERENCED_PARAMETER(corner_radius);
-}
-
 std::string CacheBusterToken() {
     return "0";
 }

src/platform/win/browser_host_win.cpp

@@ -95,42 +95,22 @@ std::pair<int, int> ParentClientSize(NativeWindow parent) {
 }
 
 Rect MenuPopupRect(NativeWindow parent, const BrowserLayout& layout) {
-    const auto [client_right, client_bottom] = ParentClientSize(parent);
-
+    const auto client_size = ParentClientSize(parent);
     const int width = ScaleForParentWindow(parent, 260);
     const int height = ScaleForParentWindow(parent, 258);
     const int margin = ScaleForParentWindow(parent, 12);
     const int overlap = ScaleForParentWindow(parent, 2);
 
-    const int x = std::max(0, client_right - width - margin);
+    const int x = std::max(0, client_size.first - width - margin);
     const int y = std::max(0, layout.chrome.y + layout.chrome.height - overlap);
     return {
         x,
         y,
-        std::min(client_right, x + width) - x,
-        std::min(client_bottom, y + height) - y,
+        std::min(client_size.first, x + width) - x,
+        std::min(client_size.second, y + height) - y,
     };
 }
 
-void ApplyRoundedBrowserRegion(NativeWindow browser_window, int corner_radius) {
-    const HWND hwnd = AsHwnd(browser_window);
-    if (!hwnd) {
-        return;
-    }
-
-    RECT rect = {};
-    if (!GetClientRect(hwnd, &rect)) {
-        return;
-    }
-
-    const int width = std::max<LONG>(1, rect.right - rect.left);
-    const int height = std::max<LONG>(1, rect.bottom - rect.top);
-    HRGN region = CreateRoundRectRgn(0, 0, width + 1, height + 1, corner_radius, corner_radius);
-    if (region && !SetWindowRgn(hwnd, region, TRUE)) {
-        DeleteObject(region);
-    }
-}
-
 std::string CacheBusterToken() {
     return std::to_string(GetTickCount64());
 }