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/lib/ae_core/ae_comp__hosted_files_upload.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
-    // Imports
     import { untrack } from 'svelte';
+    // Imports
     // Import components and elements
     import * as Lucide from 'lucide-svelte';
     import Element_input_files_tbl from '$lib/elements/element_input_files_tbl.svelte';

src/lib/ae_core/ae_comp__site_config_editor.svelte

@@ -1,11 +1,11 @@
 <script lang="ts">
+    import { untrack } from 'svelte';
     /**
      * AE_Comp_Site_Config_Editor.svelte
      * Specialized UI for managing site.cfg_json settings.
      * Supports General, AI, Performance, and IDAA-specific configurations.
      */
     import { Modal } from 'flowbite-svelte';
-    import { untrack } from 'svelte';
     import { 
         Palette, Mail, Brain, Timer, 
         ShieldCheck, CodeXml, Save,