refactor: address Svelte compiler warnings and improve a11y/security

- Convert decorative labels to spans to fix a11y warnings in Accounts and Sites pages
- Add rel="noopener noreferrer" to external links for security
- Use untrack for Svelte 5 state initialization from props in e_app_sign_in_out.svelte
- Make TipTap editor styles global to fix scoping warnings for dynamic content

src/routes/core/contacts/[contact_id]/+page.svelte

@@ -125,7 +125,7 @@
                                     <Globe size={10} /> Website
                                 </p>
                                 {#if contact.website_url}
-                                    <a href={contact.website_url} target="_blank" class="font-bold text-secondary-500 hover:underline flex items-center gap-2 truncate">
+                                    <a href={contact.website_url} target="_blank" rel="noopener noreferrer" class="font-bold text-secondary-500 hover:underline flex items-center gap-2 truncate">
                                         {contact.website_url} <Link2 size={12} />
                                     </a>
                                 {:else}