Replaces the existing search filter popover with a new responsive modal component to improve UI/UX on both desktop and mobile devices.
- Adds `components/search-filter-modal.html` implementing a responsive grid layout.
- Adds `js/ui/components/SearchFilterModal.js` to manage filter state and modal interactions.
- Updates `js/index.js` to bootstrap the new modal and bind trigger events.
- Removes obsolete `js/ui/components/SearchFiltersPopover.js`.
- Keeps advanced filters hidden by default behind a toggle.
Signed-off-by: Jules <[email protected]>
