Fix talks filter (#1807)

FIX for 

https://discord.com/channels/1498379156201672886/1526613801103786044/1526613801103786044

Author: nikoshell

src/components/SessionCard.astro

@@ -5,7 +5,7 @@ export interface Props {
   speakers?: string;
   duration: string;
   level?: string;
-  track?: string;
+  track?: string | null;
   searchText?: string;
   highlight?: boolean;
 }
@@ -31,6 +31,7 @@ const {
   data-search={searchText
     ? searchText.toLowerCase()
     : `${title.toLowerCase()} ${(track ?? "").toLowerCase()}`}
+  data-track={track}
 >
   {highlight && <span class="card-current-label">Current session</span>}
 

src/pages/talks.astro

@@ -146,6 +146,7 @@ const allDisplayTracks = [...sortedTracks, ...otherTracks];
                       speakers={speakerHtml(talk.data.speakers)}
                       duration={talk.data.duration}
                       level={talk.data.level}
+                      track={talk.data.track}
                       searchText={`${talk.data.title} ${talk.data.track || ""}`}
                     />
                   ))}