fix(projects/khora): override user theme event styles

Register Khora component CSS above GTK user-theme priority so generated themes cannot erase event backgrounds and foreground contrast.

Assisted-by: pi (gpt-5.6-sol)

projects/khora/khora/application.py

@@ -147,7 +147,7 @@ class KhoraApplication(Adw.Application):
             Gtk.StyleContext.add_provider_for_display(
                 display,
                 provider,
-                Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION,
+                Gtk.STYLE_PROVIDER_PRIORITY_USER + 1,
             )
 
     def _on_appearance_changed(self, *_args) -> None:

projects/khora/khora/window.py

@@ -718,7 +718,7 @@ class KhoraWindow(Adw.ApplicationWindow):
             Gtk.StyleContext.add_provider_for_display(
                 self.get_display(),
                 provider,
-                Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION,
+                Gtk.STYLE_PROVIDER_PRIORITY_USER + 1,
             )
             self._event_color_providers[class_name] = provider
         return class_name