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/core/accounts/[account_id]/+page.svelte

@@ -7,7 +7,7 @@
     import { goto } from '$app/navigation';
     import { Save, Trash2, ArrowLeft, Building, Settings, Activity, Info } from 'lucide-svelte';
 
-    let account_id = $page.params.account_id;
+    let account_id = $derived($page.params.account_id ?? '');
     let account: any = $state(null);
     let loading = $state(true);
     let saving = $state(false);