Increased number of visible results

Increased total limit to 30.
Increased dropdown height to show more results initially (and which can also be scrolled into view).
After upgrade to next Mantine major version, scrollbars will appear automatically (when that code is uncommented).

frontend/src/components/Search.tsx

@@ -85,6 +85,10 @@ const Search: FunctionComponent = () => {
       size="sm"
       data={results}
       value={query}
+      limit={30}
+      // uncomment following line after upgrade to Mantine 7.x or higher
+      // scrollAreaProps = {{type: auto}}
+      maxDropdownHeight={400}
       onChange={setQuery}
       onBlur={() => setQuery("")}
       filter={(value, item) =>