fix: Update filtered count badge when type filter returns empty results

The filteredCountBadge in "Add Filtered" button was not updating when
unchecking type filter checkboxes resulted in zero matching contacts.
Now resets badge to '0' and clears filteredPendingContacts array.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/static/js/contacts.js

@@ -701,6 +701,11 @@ async function loadPendingContacts() {
                 // Show empty state
                 if (emptyEl) emptyEl.style.display = 'block';
                 if (countBadge) countBadge.style.display = 'none';
+
+                // Reset filtered count badge when no contacts match type filter
+                const filteredCountBadge = document.getElementById('filteredCountBadge');
+                if (filteredCountBadge) filteredCountBadge.textContent = '0';
+                filteredPendingContacts = [];
             } else {
                 // Initialize filtered list and apply filters (default: CLI only)
                 filteredPendingContacts = [...pendingContacts];