fix: table sorting blocked by pointerEvents:none during loading

Root cause: useListData set loading=true on every refetch, and all 4
admin list pages (offers, orders, invoices, projects) applied
pointerEvents:'none' while loading — blocking all clicks including
sort column headers.

Fix: removed setLoading(true) from refetch (matching PHP behavior)
and removed pointerEvents from all list page cards. Opacity fade
kept as visual feedback.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/admin/pages/Projects.tsx

@@ -143,7 +143,7 @@ export default function Projects() {
         initial={{ opacity: 0, y: 12 }}
         animate={{ opacity: 1, y: 0 }}
         transition={{ duration: 0.25, delay: 0.06 }}
-        style={{ opacity: loading ? 0.6 : 1, transition: 'opacity 0.2s', pointerEvents: loading ? 'none' : 'auto' }}
+        style={{ opacity: loading ? 0.6 : 1, transition: 'opacity 0.2s' }}
       >
         <div className="admin-card-body">
           <div className="admin-search-bar mb-4">