refactor: standardize 'prevent_default' helpers and batch format modules

- Renamed internal 'preventDefault' helpers to 'prevent_default' for project-wide snake_case consistency.
- Corrected native event method calls from 'prevent_default()' to 'preventDefault()' to resolve runtime TypeErrors.
- Applied batch formatting (printWidth: 80) to Journals and IDAA Recovery Meetings modules.
- Removed deprecated 'preventDefault' imports from svelte/legacy.
- Fixed Journal Entry 404 by migrating loader to V3 API helper.

src/routes/events/[event_id]/(badges)/templates/ae_comp__badge_template_form.svelte

@@ -20,9 +20,9 @@
         oncancel
     }: Props = $props();
 
-    function preventDefault(fn: () => void) {
+    function prevent_default(fn: () => void) {
         return function (event: Event) {
-            event.preventDefault();
+            event.prevent_default();
             fn();
         };
     }
@@ -141,7 +141,7 @@
     }
 </script>
 
-<form onsubmit={preventDefault(handle_submit)} class="p-4 space-y-4">
+<form onsubmit={prevent_default(handle_submit)} class="p-4 space-y-4">
     <h3 class="h3">{template_id ? 'Edit' : 'Create New'} Badge Template</h3>
 
     <label class="label">