fix(time-tracking) : return empty collection instead of 404 for active timer endpoint

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/Entity/TimeEntry.php

@@ -25,11 +25,12 @@ use Symfony\Component\Serializer\Attribute\Groups;
 #[ApiResource(
     operations: [
         new GetCollection(),
-        new Get(
+        new GetCollection(
             name: 'active_time_entry',
             uriTemplate: '/time_entries/active',
             provider: ActiveTimeEntryProvider::class,
             description: 'Get the active timer for the current user',
+            paginationEnabled: false,
         ),
         new Get(),
         new Post(security: "is_granted('ROLE_USER')"),