Several bugfixes

- Fixed event invisibility when offset is after event's half width
- Fixed event being shown outside timeline component
- When timer reaches 24:00:00, new day is automatically started

ui/app-window.slint

@@ -7,6 +7,7 @@ export component AppWindow inherits Window {
     callback start-new-event <=> record.start-new-event;
     callback stop-event <=> record.stop-event;
     callback chain-event <=> record.chain-event;
+    callback new-day-started <=> record.new-day-started;
     callback update-record-offset(int);
     callback save-log;