fix(wallet): update balance observable on initial connect

- Call refreshBalance() in createWalletFromURI to fetch initial balance
- Update balance$ directly when ConnectWalletDialog gets balance
- Fixes issue where WalletViewer showed "-" after connecting while
  user menu showed correct balance (different data sources)

https://claude.ai/code/session_01CnJgjFMvZHZWs2ujAiWAiQ

src/components/ConnectWalletDialog.tsx

@@ -11,7 +11,7 @@ import {
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { useGrimoire } from "@/core/state";
-import { createWalletFromURI } from "@/services/nwc";
+import { createWalletFromURI, balance$ } from "@/services/nwc";
 
 interface ConnectWalletDialogProps {
   open: boolean;
@@ -66,6 +66,8 @@ export default function ConnectWalletDialog({
       try {
         const balanceResult = await wallet.getBalance();
         balance = balanceResult.balance;
+        // Update the observable immediately so WalletViewer shows correct balance
+        balance$.next(balance);
       } catch (err) {
         console.warn("[NWC] Failed to get balance:", err);
         // Balance is optional, continue anyway

src/services/nwc.ts

@@ -149,6 +149,7 @@ export function createWalletFromURI(connectionString: string): WalletConnect {
   wallet$.next(wallet);
 
   subscribeToNotifications(wallet);
+  refreshBalance(); // Fetch initial balance
 
   return wallet;
 }