fix(idaa): finalize null-safety for BB comment editor

- Added optional chaining to all post_comment_obj property accesses.
- Resolved TypeError when clicking 'New Comment' button.
- Hardened UI stability for asynchronous data loading.

src/routes/idaa/(idaa)/bb/ae_idaa_comp__post_comment_obj_id_edit.svelte

@@ -38,7 +38,22 @@
 
     let prom_api__post_comment_obj: any = $state();
 
-    let content_new_html = $state($idaa_slct.post_comment_obj?.content ?? '');
+    // SVELTE 5 STABILITY: Use local state for form bindings to prevent 
+    // crashes when the global store object is briefly null.
+    let post_comment_form = $state({
+        content: $idaa_slct.post_comment_obj?.content ?? '',
+        anonymous: $idaa_slct.post_comment_obj?.anonymous ?? false,
+        external_person_id: $idaa_slct.post_comment_obj?.external_person_id ?? '',
+        full_name: $idaa_slct.post_comment_obj?.full_name ?? '',
+        email: $idaa_slct.post_comment_obj?.email ?? '',
+        enable: $idaa_slct.post_comment_obj?.enable ?? true,
+        hide: $idaa_slct.post_comment_obj?.hide ?? false,
+        priority: $idaa_slct.post_comment_obj?.priority ?? false,
+        sort: $idaa_slct.post_comment_obj?.sort ?? 0,
+        group: $idaa_slct.post_comment_obj?.group ?? ''
+    });
+
+    let content_new_html = $state(post_comment_form.content);
     let content_changed = $state(false);
     // let notes_new_html = $state('');
     // let notes_changed = $state(false);