fix: remove --no-sandbox, dynamic screen resolution detection

browser.py

@@ -19,8 +19,9 @@ BOOKMARKS_FILE = "/home/jgitta/kiosk-browser/bookmarks.json"
 CDP_PORT       = 9222
 TOOLBAR_H      = 72          # single row — was 142 (82 + 60)
 TOP_H          = TOOLBAR_H
-SCREEN_W       = 1920
-SCREEN_H       = 1080
+# Screen size is detected dynamically in main() after QApplication starts
+SCREEN_W       = 1920  # overwritten at runtime
+SCREEN_H       = 1080  # overwritten at runtime
 
 # ── Colour palette ────────────────────────────────────────────────
 TOOLBAR_COLOR = "#1a3a5c"
@@ -622,7 +623,6 @@ def launch_chrome():
         "--disable-background-networking",
         "--disable-extensions",
         "--disable-gpu",
-        "--no-sandbox",
         "--disable-blink-features=AutomationControlled",
         "--disable-dev-shm-usage",
         "--user-data-dir=/home/jgitta/chromium-kiosk",
@@ -638,6 +638,10 @@ def launch_chrome():
 # ── Main ──────────────────────────────────────────────────────────
 if __name__ == "__main__":
     app = QApplication(sys.argv)
+    # Detect actual screen resolution at runtime
+    global SCREEN_W, SCREEN_H
+    _geo = app.primaryScreen().geometry()
+    SCREEN_W, SCREEN_H = _geo.width(), _geo.height()
     app.setApplicationName("SeniorNet")
     p = app.palette(); p.setColor(QPalette.Window, QColor("#1a3a5c")); app.setPalette(p)