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/journals/ae_comp__modal_journal_import.svelte

@@ -44,25 +44,25 @@
     });
 
     function handle_drag_enter(e: DragEvent) {
-        e.prevent_default();
+        e.preventDefault();
         e.stopPropagation();
         is_dragging = true;
     }
 
     function handle_drag_leave(e: DragEvent) {
-        e.prevent_default();
+        e.preventDefault();
         e.stopPropagation();
         is_dragging = false;
     }
 
     function handle_drag_over(e: DragEvent) {
-        e.prevent_default();
+        e.preventDefault();
         e.stopPropagation();
         is_dragging = true;
     }
 
     function handle_drop(e: DragEvent) {
-        e.prevent_default();
+        e.preventDefault();
         e.stopPropagation();
         is_dragging = false;