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/app_components/e_app_sign_in_out.svelte

@@ -1,8 +1,8 @@
 <script lang="ts">
+    import { untrack } from 'svelte';
     // *** Import Svelte specific
     import { browser } from '$app/environment';
     import { goto, invalidateAll } from '$app/navigation';
-    import { untrack } from 'svelte';
     import { Modal } from 'flowbite-svelte';
 
     // *** Import other supporting libraries
@@ -46,10 +46,12 @@
         // NOTE: Sync URL params to state. 
         // We use untrack to prevent infinite loops if navigation triggers within this effect.
         // WARNING: Ensure this doesn't clobber user-entered data during background URL updates.
-        url_user_id = data?.url?.searchParams?.get('user_id');
-        url_user_key = data?.url?.searchParams?.get('user_key');
-        url_user_username = data?.url?.searchParams?.get('username');
-        url_user_email = data?.url?.searchParams?.get('user_email');
+        untrack(() => {
+            url_user_id = data?.url?.searchParams?.get('user_id');
+            url_user_key = data?.url?.searchParams?.get('user_key');
+            url_user_username = data?.url?.searchParams?.get('username');
+            url_user_email = data?.url?.searchParams?.get('user_email');
+        });
     });
 
     let ae_promises: key_val = {};