fix(core): resolve 68 compiler errors and stabilize Svelte 5 reactivity

- Fixed 'Captured initial value' warnings in 65+ components by implementing
  proper sync effects with 'untrack' and derived states.
- Hardened Event Settings JSON editors using a temporary string-buffer pattern
  to safely decouple object-based data from CodeMirror's string requirements.
- Resolved strict TypeScript mismatches across core routes (Accounts, Sites, etc.)
  and improved property indexing safety in views.
- Patched Flowbite-Svelte Drawer transitions for Svelte 5 compatibility using
  prop spreading.
- Added comprehensive safety comments to high-risk reactivity blocks.
- Synchronized 'ae_types.ts' with V3 backend models.

src/routes/events/[event_id]/+page.svelte

@@ -39,9 +39,14 @@
     import Event_page_menu from './event_page_menu.svelte';
 
     // Quickly save the data passed from the parent(s) to the Svelte stores, localStorage, and other.
-    let ae_acct = data[$slct.account_id];
-    let event_id = data.params.event_id;
-    $events_slct.event_id = ae_acct.slct.event_id;
+    let ae_acct = $derived(data[$slct.account_id]);
+    let event_id = $derived(data.params.event_id);
+
+    $effect(() => {
+        if (ae_acct) {
+            $events_slct.event_id = ae_acct.slct.event_id;
+        }
+    });
 
     // *** Initialization & Store Guard ***
     if ($events_loc.pres_mgmt) {