The Events page is easier to browse with clearer country indicators, better use of space in the search area, and tag counts shown directly in filter dropdowns. Visitors also see events from their current country first when country filtering is available, helping them find relevant local events faster.

1. Add country flag when filter option is on
2. Reduce search bar width for >lg screens
3. Show tags inside the category drop down title instead of in a separate line, for larger screen. Also add a 'All' option to clear all searched tags of that category.

Task-3869922

The calendar module's internal automated tests were updated to use Odoo's newer testing framework. This improves maintainability and reliability of future calendar quality checks without changing the user-facing calendar experience.

Update legacy tests importing mail/test_utils.js to use HOOT instead of Qunit.

Task-3818666