fix(svelte): resolve props_invalid_value and dexie DataError

- Initialize ds_loaded properties in ae_stores.ts to fix svelte binding error.
- Make db_save_ae_obj_li__ae_obj in core__idb_dexie.ts schema-aware to fix Dexie DataError when saving to tables with non-'id' primary keys.

src/lib/stores/ae_stores.ts

@@ -372,7 +372,11 @@ const ae_app_session_data_defaults: key_val = {
     ds: {
         submit_status: null
     },
-    ds_loaded: {},
+    ds_loaded: {
+        hub__site__root_page_header: false,
+        hub__site__root_page_content: false,
+        hub__site__root_page_footer: false
+    },
 
     files: {
         disable_submit__hosted_file_obj: false,
@@ -380,6 +384,7 @@ const ae_app_session_data_defaults: key_val = {
         uploaded_file_kv: {},
         video_clip_file_kv: {},
         processed_file_list: [],
+        status__file_list: null,
         // uploaded_file_list: [],
         video_clip_file_list: [],
         submit_status: null, // 'saving', 'created', 'updated', 'saved'