fix(ui): reduce settings dialog height to prevent overflow on lower-res screens (#456)

Reduce dialog height ratio from 50% to 40% of viewport and revert
Advanced tab scrolled window min_content_height from 500px back to
350px. The 500px min content height (introduced for Remote Server
section) forced the dialog to grow beyond its viewport cap on screens
under 1000px tall, causing it to dominate lower-resolution displays.

src/vocalinux/ui/settings_dialog.py

@@ -811,7 +811,7 @@ class SettingsDialog(Gtk.Dialog):
         else:
             screen_height = 1080  # Default fallback
             screen_width = 1920
-        dialog_height = int(screen_height * 0.5)
+        dialog_height = int(screen_height * 0.4)
         dialog_width = min(700, int(screen_width * 0.8))
         self.set_default_size(dialog_width, dialog_height)
         self.get_style_context().add_class("settings-dialog")
@@ -1646,7 +1646,7 @@ class SettingsDialog(Gtk.Dialog):
         # Scrollable container for the controls
         scrolled = Gtk.ScrolledWindow()
         scrolled.set_policy(Gtk.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC)
-        scrolled.set_min_content_height(500)
+        scrolled.set_min_content_height(350)
 
         controls_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=12)