fix(idaa): harden data sync against padStart crashes and fix Archive Content sort

- Hardened object processors in Archives and Posts modules to safely handle null 'sort' values, preventing runtime TypeErrors during data synchronization.
- Fixed inconsistent sorting in Archive Content list by correctly implementing descending order (sort then reverse) and adding a configuration loading guard to the liveQuery.
- Standardized safe data processing patterns in SVELTE_DEXIE_GUIDE.md.
- Performed minor cleanup and visibility logic hardening in Recovery Meetings module.

src/lib/ae_posts/ae_posts__post_comment.ts

@@ -360,11 +360,12 @@ export async function process_ae_obj__post_comment_props({
         obj_type: 'post_comment',
         log_lvl,
         specific_processor: (obj) => {
+            const sort_val = (obj.sort ?? 0).toString().padStart(3, '0');
             obj.tmp_sort_1 = `${obj.group ?? ''}_${obj.priority ? '1' : '0'}_${
-                obj.sort?.toString().padStart(3, '0') ?? ''
+                sort_val
             }_${obj.updated_on ?? obj.created_on}`;
             obj.tmp_sort_2 = `${obj.group ?? ''}_${obj.priority ? '1' : '0'}_${
-                obj.sort?.toString().padStart(2, '0') ?? ''
+                (obj.sort ?? 0).toString().padStart(2, '0')
             }_${obj.updated_on}_${obj.created_on}`;
 
             return obj;