fix: mirror #734 onto decomposed files (PG NaN slideshow seed, SQLite bool renders)

Same two pre-existing-on-main bugs, at their post-decomposition
locations: clampIntOrUndefined in adminEvents/crud.js slideshow seed;
!! coercion in EventDetailsHeader, EventInformationCard,
ClientAccessCard. Keeps this branch correct in either merge order with
#734 — when merging main afterwards, resolve the adminEvents.js
modify/delete conflict by keeping the deletion.

frontend/src/pages/admin/event-details/ClientAccessCard.tsx

@@ -49,7 +49,8 @@ export const ClientAccessCard: React.FC<ClientAccessCardProps> = ({ event, refet
           </div>
         </label>
 
-        {event?.client_access_enabled && (
+        {/* !! — SQLite integer boolean; bare 0 renders as literal "0" */}
+        {!!event?.client_access_enabled && (
           <>
             {/* Set/Change PIN */}
             <div className="flex items-end gap-2">

frontend/src/pages/admin/event-details/EventDetailsHeader.tsx

@@ -207,7 +207,8 @@ export const EventDetailsHeader: React.FC<EventDetailsHeaderProps> = ({
       </div>
 
       {/* Draft Banner */}
-      {event.is_draft && !event.is_archived && (
+      {/* !! — SQLite returns integer booleans; a bare 0 would render as literal "0" */}
+      {!!event.is_draft && !event.is_archived && (
         <Card className="p-4 mb-6 border-2 border-yellow-500 bg-yellow-50 dark:bg-yellow-900/20">
           <div className="flex items-start gap-3">
             <AlertTriangle className="w-5 h-5 flex-shrink-0 text-yellow-600 dark:text-yellow-400" />

frontend/src/pages/admin/event-details/EventInformationCard.tsx

@@ -835,13 +835,14 @@ export const EventInformationCard: React.FC<EventInformationCardProps> = ({
                 }`}>
                   {event.protection_level || 'standard'}
                 </span>
-                {event.disable_right_click && (
+                {/* !! on the next three — SQLite integer booleans render literal "0" when falsy */}
+                {!!event.disable_right_click && (
                   <span className="inline-flex items-center px-2 py-1 text-xs font-medium bg-neutral-100 dark:bg-neutral-700 text-neutral-700 dark:text-neutral-300 rounded">
                     <MousePointer className="w-3 h-3 mr-1" />
                     {t('events.rightClickBlocked', 'Right-click blocked')}
                   </span>
                 )}
-                {event.enable_devtools_protection && (
+                {!!event.enable_devtools_protection && (
                   <span className="inline-flex items-center px-2 py-1 text-xs font-medium bg-neutral-100 dark:bg-neutral-700 text-neutral-700 dark:text-neutral-300 rounded">
                     <Monitor className="w-3 h-3 mr-1" />
                     {t('events.devtoolsDetection', 'DevTools detection')}
@@ -853,7 +854,7 @@ export const EventInformationCard: React.FC<EventInformationCardProps> = ({
                     {t('events.downloadsDisabled', 'Downloads disabled')}
                   </span>
                 )}
-                {event.watermark_downloads && (
+                {!!event.watermark_downloads && (
                   <span className="inline-flex items-center px-2 py-1 text-xs font-medium bg-neutral-100 dark:bg-neutral-700 text-neutral-700 dark:text-neutral-300 rounded">
                     <Droplets className="w-3 h-3 mr-1" />
                     {t('events.watermarked', 'Watermarked')}