fix search provider names/ids, set results thumbnail urls, use them in ref provider

Signed-off-by: Julien Veyssier <julien-nc@posteo.net>

lib/Search/BoardSearchResultEntry.php

@@ -26,13 +26,16 @@ declare(strict_types=1);
 
 namespace OCA\Deck\Search;
 
+use OCA\Deck\AppInfo\Application;
 use OCA\Deck\Db\Board;
 use OCP\Search\SearchResultEntry;
 
 class BoardSearchResultEntry extends SearchResultEntry {
 	public function __construct(Board $board, $urlGenerator) {
 		parent::__construct(
-			'',
+			$urlGenerator->getAbsoluteURL(
+				$urlGenerator->imagePath(Application::APP_ID, 'deck-dark.svg')
+			),
 			$board->getTitle(),
 			'',
 			$urlGenerator->linkToRouteAbsolute('deck.page.index') . '#/board/' . $board->getId(),