Fix infinite hydration loop and stabilize global store synchronization

- Refactored layouts to derive account data from stable props instead of reactive stores.
- Wrapped store updates in untrack() with deep equality guards to prevent infinite re-renders.
- Resolved duplicate untrack declarations and missing imports across the project.
- Added fetch safeguards to Element_data_store to prevent redundant API calls.
- Standardized hydration patterns to break circular dependencies during initial load.

src/routes/journals/[journal_id]/+layout.svelte

@@ -24,7 +24,9 @@
 
     import Journal_entry_obj_qry from './../ae_comp__journal_entry_obj_qry.svelte';
 
-    let ae_acct = data[$slct.account_id];
+    // NOTE: Derived from data.account_id (prop) instead of $slct.account_id (store)
+    // to prevent circular dependency loops during hydration.
+    let ae_acct = $derived(data[data.account_id]);
     $effect(() => {
         if (log_lvl) {
             console.log(`ae_acct = `, ae_acct);

src/routes/journals/[journal_id]/+page.svelte

@@ -43,7 +43,7 @@
     import AeCompModalJournalImport from '../ae_comp__modal_journal_import.svelte';
 
     // Variables
-    let ae_acct = data[$slct.account_id];
+    let ae_acct = data[data.account_id];
     let show_export_modal = $state(false);
     let show_import_modal = $state(false);
 

src/routes/journals/[journal_id]/entry/[journal_entry_id]/+page.svelte

@@ -47,7 +47,7 @@
 
     // Variables
     // *** Quickly pull out data from parent(s)
-    let ae_acct = data[$slct.account_id];
+    let ae_acct = data[data.account_id];
     let show_export_modal = $state(false);
 
     $effect(() => {