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/CommentSearchResultEntry.php

@@ -26,6 +26,7 @@ declare(strict_types=1);
 
 namespace OCA\Deck\Search;
 
+use OCA\Deck\AppInfo\Application;
 use OCA\Deck\Db\Card;
 use OCP\IL10N;
 use OCP\IURLGenerator;
@@ -36,7 +37,9 @@ class CommentSearchResultEntry extends SearchResultEntry {
 
 	public function __construct(string $commentId, string $commentMessage, string $commentAuthor, Card $card, IURLGenerator $urlGenerator, IL10N $l10n) {
 		parent::__construct(
-			'',
+			$urlGenerator->getAbsoluteURL(
+				$urlGenerator->imagePath('core', 'actions/comment.svg')
+			),
 			// TRANSLATORS This is describing the author and card title related to a comment e.g. "Jane on MyTask"
 			$l10n->t('%s on %s', [$commentAuthor, $card->getTitle()]),
 			$commentMessage,