Some (alot) of fixes

src/components/admin/pages/event/FightList.svelte

@@ -82,7 +82,7 @@
         } else {
             groupFights.forEach(fight => selectedFights.add(fight));
         }
-        selectedFights = selectedFights;
+        selectedFights = new Set(selectedFights);
     }
 
     let deleteOpen = $state(false);
@@ -227,16 +227,17 @@
             <h1 class="ml-4 text-2xl">{group.group ?? "Ungrouped"}</h1>
         </div>
         {#each group.fights.sort((a, b) => a.start - b.start) as fight, i (fight.id)}
-            <FightCard {fight} {i} {data} selected={selectedFights.has(fight)}
-                       on:select={() => {
+            {@const isSelected = selectedFights.has(fight)}
+            <FightCard {fight} {i} {data} selected={isSelected}
+                       select={() => {
                     if (selectedFights.has(fight)) {
                         selectedFights.delete(fight);
                     } else {
                         selectedFights.add(fight);
                     }
-                    selectedFights = selectedFights;
-                }}
-                       on:update={async () => fights = await $fightRepo.listFights(data.event.id)}
+
+                    selectedFights = new Set(selectedFights);
+                }} update={async () => fights = await $fightRepo.listFights(data.event.id)}
             />
         {/each}
     {/each}