Added the ability to disable group similar time entries (#1054)

* Added the ability to disable group similar time entries

* Fix E2E test for Group similar time entries

* Simplify `TimeEntryGroupedTable` by replacing ternary with early return logic

* Refactor time entry grouping settings: rename storage key, move logic into a dedicated module

* Replace fixed `waitForTimeout` calls in E2E tests with element-based waits and assertions

* Run frontend linting and formatting for changes

resources/js/packages/ui/src/GroupedItemsCountButton.vue

@@ -6,10 +6,15 @@ const props = withDefaults(
     defineProps<{
         expanded?: boolean;
         size?: string;
+        /**
+         * Test ID used for Playwright/E2E tests.
+         */
+        testId?: string;
     }>(),
     {
         expanded: false,
         size: 'w-7 h-7',
+        testId: 'grouped_items_count_button',
     }
 );
 
@@ -23,6 +28,7 @@ const expandedStatusClasses = computed(() => {
 
 <template>
     <button
+        :data-testid="props.testId"
         :class="
             twMerge(
                 'font-medium text-base rounded flex items-center transition justify-center focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:border-transparent',