Event search (Ctrl+F), locale/RTL handling, weekday selector workday/weekend, refactored event handling, Firefox compatibility (#3)

Major refactoring for cleanup, with various bugfixes.

Weekday selector in Settings now shows workdays/weekend bars based on current locale (also used to choose default values). Weekday selector in event dialog uses the days set in settings, as expected.

src/components/BaseDialog.vue

@@ -79,10 +79,10 @@ const modalStyle = computed(() => {
   if (modalRef.value && props.modelValue) {
     const style = {
       transform: 'none',
-      left: modalPosition.value.x + 'px',
+      insetInlineStart: modalPosition.value.x + 'px',
       top: modalPosition.value.y + 'px',
       bottom: 'auto',
-      right: 'auto',
+      insetInlineEnd: 'auto',
     }
     if (hasMoved.value) {
       style.width = dialogWidth.value ? dialogWidth.value + 'px' : undefined