Standardize Exhibit Leads module: Rich text support and naming alignment

- Integrated TipTap rich text editor for Booth Descriptions and Exhibitor Notes.
- Implemented strip_html utility for clean search/preview of rich text fields.
- Renamed exhibit loading functions to follow load_ae_obj_id__event_exhibit* pattern.
- Hardened property processors with 'undefined' string guards and automatic reload triggers.
- Resolved type mismatches and naming inconsistencies across the Leads module.
- Verified zero-error state via svelte-check.

src/lib/ae_utils/ae_utils.ts

@@ -265,6 +265,14 @@ export const shorten_string = function shorten_string({
     return new_string;
 };
 
+/**
+ * Strips HTML tags from a string.
+ */
+export function strip_html(html: string): string {
+    if (!html) return '';
+    return html.replace(/<[^>]*>?/gm, '');
+}
+
 // Svelte action to set focus on an element
 function set_focus(node: HTMLElement, focus: boolean) {
     if (focus) {
@@ -341,6 +349,7 @@ export const ae_util = {
     to_title_case: to_title_case,
     shorten_string: shorten_string,
     shorten_filename: shorten_filename,
+    strip_html: strip_html,
     file_extension_icon: file_extension_icon,
     file_extension_icon_lucide: file_extension_icon_lucide,
     format_html: format_html,