Always reset playerEvent on character creation

CreateCharacter now calls setPlayerEvent(null) for non-event characters,
clearing any stale event state from a previously selected character and
resetting leaderboardScope back to global.

Author: jptaylor

client/app/src/components/CreateCharacter.tsx

@@ -48,12 +48,13 @@ export const CreateCharacter = ({
         throw new Error(data.error)
       }
       const data = await response.json()
-      if (data.event_id && data.event_title) {
-        useGameStore.getState().setPlayerEvent({
-          event_id: data.event_id,
-          title: data.event_title,
-        })
-      }
+      useGameStore
+        .getState()
+        .setPlayerEvent(
+          data.event_id && data.event_title ?
+            { event_id: data.event_id, title: data.event_title }
+          : null
+        )
       onCharacterCreate(data.character_id)
     } catch (error) {
       setError(error instanceof Error ? error.message : "Failed to create character")