feat: Add subscriptionDetails getter to RelayHub for detailed subscription information

- Implement a new getter method in RelayHub to return an array of subscription details, including IDs, filters, and associated relays.
- Enhance the ability to track and manage subscriptions more effectively within the RelayHub component.

src/lib/nostr/relayHub.ts

@@ -97,6 +97,17 @@ export class RelayHub extends EventEmitter {
     return this.subscriptions.size
   }
 
+  get subscriptionDetails(): Array<{ id: string; filters: any[]; relays?: string[] }> {
+    return Array.from(this.subscriptions.entries()).map(([id, subscription]) => {
+      // Try to extract subscription details if available
+      return {
+        id,
+        filters: subscription.filters || [],
+        relays: subscription.relays || []
+      }
+    })
+  }
+
   get relayStatuses(): RelayStatus[] {
     return Array.from(this.relayConfigs.values()).map(config => {
       const relay = this.connectedRelays.get(config.url)