fix: only remove app circle on delete if namespace has no remaining records

previously, any delete event (like unliking a post) would immediately
remove the app circle from the UI. now we lazily check the PDS to see
if the namespace still has records before removing.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[e-mail]>

static/app.js

···
             // Particle reached destination - pulse the identity/PDS
             pulseIdentity();
 
-            // If this was a delete event, remove the app circle
+            // If this was a delete event, lazily check if app should be removed
             if (particle.metadata && particle.metadata.action === 'delete') {
-                removeAppCircle(particle.metadata.namespace);
+                maybeRemoveAppCircle(particle.metadata.namespace);
             }
         }
         return alive;
···
 
     // Reposition remaining circles
     repositionAppCircles();
+}
+
+// Check if a namespace still has records (any collection with count > 0)
+async function namespaceHasRecords(namespace) {
+    if (!globalApps || !globalApps[namespace] || !globalPds) {
+        return false;
+    }
+
+    // Check each collection in this namespace
+    for (const collection of globalApps[namespace]) {
+        try {
+            const url = `${globalPds}/xrpc/com.atproto.repo.listRecords?repo=${encodeURIComponent(did)}&collection=${encodeURIComponent(collection)}&limit=1`;
+            const response = await fetch(url);
+            if (response.ok) {
+                const data = await response.json();
+                if (data.records && data.records.length > 0) {
+                    return true; // Found at least one record
+                }
+            }
+        } catch (e) {
+            console.error(`Error checking records for ${collection}:`, e);
+        }
+    }
+    return false;
+}
+
+// Lazily check and remove app circle if namespace has no more records
+async function maybeRemoveAppCircle(namespace) {
+    const hasRecords = await namespaceHasRecords(namespace);
+    if (!hasRecords) {
+        removeAppCircle(namespace);
+    }
 }
 
 // Check auth status on page load