v0.05: fix Roundcube autologin + hamburger menu focus

Roundcube autologin fix:
- Added missing session->regenerate_id(false) and session->set_auth_cookie()
  calls after login, matching Roundcube's normal login flow in index.php.
  Without these, the roundcube_sessauth cookie was never set, causing every
  second request to fail with 'session is invalid or expired'.

Hamburger menu fix:
- Added activateWindow() + raise_() + processEvents() before menu.exec_()
  to ensure the toolbar window is active before the QMenu event loop starts.
  Without this, WA_ShowWithoutActivating prevents focus from being grabbed
  and the menu vanishes immediately.
- Added try/except to surface any silent errors.

browser.py

@@ -413,19 +413,29 @@ class KioskOverlay(QWidget):
         return bar
 
     def _show_bookmarks_menu(self):
-        menu = self._build_menu(load_bm())
-        menu.addSeparator()
-        mgr_act = QAction("  ⚙  Manage Bookmarks…", menu)
-        mgr_act.triggered.connect(self.open_manager)
-        menu.addAction(mgr_act)
-        # Explicitly position menu just below the toolbar, right-aligned.
-        # sizeHint() gives the menu's preferred width before it is painted;
-        # fall back to 360px if it hasn't been computed yet.
-        mw = menu.sizeHint().width()
-        if mw < 100:
-            mw = 360
-        x = max(0, SCREEN_W - mw - 6)
-        menu.exec_(QPoint(x, TOOLBAR_H))
+        try:
+            menu = self._build_menu(load_bm())
+            menu.addSeparator()
+            mgr_act = QAction("  ⚙  Manage Bookmarks…", menu)
+            mgr_act.triggered.connect(self.open_manager)
+            menu.addAction(mgr_act)
+
+            # The toolbar has WA_ShowWithoutActivating, so it never steals
+            # focus from Chrome.  QMenu.exec_() needs the window to be active
+            # to capture mouse/keyboard events; without this the menu flashes
+            # and vanishes immediately.
+            self.activateWindow()
+            self.raise_()
+            QApplication.instance().processEvents()
+
+            # Position right-aligned just below the toolbar.
+            mw = menu.sizeHint().width()
+            if mw < 100:
+                mw = 360
+            x = max(0, SCREEN_W - mw - 6)
+            menu.exec_(QPoint(x, TOOLBAR_H))
+        except Exception as e:
+            print(f"Bookmarks menu error: {e}", flush=True)
 
     def _build_menu(self, items):
         menu = QMenu()