nwc: turn pending zap orange when we have a NWC success

Orange means payment successful now, not just presence of zap

This introduces a paid pending state, which shows up as an orange timer
thing in the zaps view. This can be useful if the zap is never sent. We
don't want the user to think the payment didn't go through.

damus/Components/ZapButton.swift

@@ -54,13 +54,14 @@ struct ZapButton: View {
     }
     
     var zap_color: Color {
-        switch our_zap {
-        case .none:
+        guard let our_zap else {
             return Color.gray
-        case .pending:
-            return Color.yellow
-        case .zap:
+        }
+        
+        if our_zap.is_paid {
             return Color.orange
+        } else {
+            return Color.yellow
         }
     }
     
@@ -260,7 +261,9 @@ func send_zap(damus_state: DamusState, event: NostrEvent, lnurl: String, is_cust
                     return
                 }
                 
-                pzap_state.state = .postbox_pending(nwc_req)
+                if pzap_state.update_state(state: .postbox_pending(nwc_req)) {
+                    // we don't need to trigger a ZapsDataModel update here
+                }
             case .external(let pending_ext):
                 pending_ext.state = .done
                 let ev = ZappingEvent(is_custom: is_custom, type: .got_zap_invoice(inv), event: event)
@@ -285,7 +288,9 @@ func cancel_zap(zap: PendingZap, box: PostBox, zapcache: Zaps, evcache: EventCac
     
     switch nwc_state.state {
     case .fetching_invoice:
-        nwc_state.state = .cancel_fetching_invoice
+        if nwc_state.update_state(state: .cancel_fetching_invoice) {
+            // we don't need to update the ZapsDataModel here
+        }
         // let the code that retrieves the invoice remove the zap, because
         // it still needs access to this pending zap to know to cancel