Add NIP-60 Cashu wallet viewer command

Implemented a new `wallet` command to view and display NIP-60 Cashu wallets stored on Nostr relays.

## Changes

### New Command: wallet
- Added `wallet [identifier]` command to man pages (src/types/man.ts)
- Supports viewing own wallet (`wallet` or `wallet $me`)
- Supports viewing other users' wallets (`wallet npub1...`, `wallet fiatjaf.com`)
- Added wallet app ID to AppId type (src/types/app.ts)

### WalletViewer Component (src/components/WalletViewer.tsx)
Created comprehensive NIP-60 wallet viewer with:

**Data Fetching:**
- Fetches kind:17375 (wallet config) using eventStore.replaceable()
- Fetches kind:7375 (token events) using eventStore.timeline()
- Fetches kind:7376 (history events) using eventStore.timeline()
- Reactive updates using applesauce-react hooks (use$)

**UI Features:**
- Wallet status display (config, tokens, history counts)
- Balance card (shows encrypted state, token count)
- Transaction history card (shows encrypted state)
- Developer info section with raw event JSON
- Educational content about NIP-60 and Cashu
- Links to compatible apps (noStrudel, Cashu.me)
- "What is NIP-60?" help section

**States Handled:**
- No active account (requires login)
- No wallet found (educational content for own wallet)
- Wallet found but encrypted (displays structure)
- Own wallet vs other user's wallet

**Security:**
- Shows wallet data is NIP-44 encrypted
- Indicates decryption functionality is planned for future
- Prevents viewing other users' encrypted wallet data
- Educational content about privacy model

### WindowRenderer Integration
- Added lazy import for WalletViewer component
- Added case for "wallet" appId in switch statement
- Passes pubkey prop to WalletViewer

## User Experience

The wallet command provides:
✅ Clear indication of wallet existence
✅ Visual feedback on encrypted state
✅ Event counts for transparency
✅ Educational content for new users
✅ Developer-friendly raw event inspection
✅ Links to specification and compatible apps

## Future Enhancements

This implementation provides the foundation for:
- NIP-44 decryption with user's private key
- Balance calculation from decrypted proofs
- Transaction history display
- Wallet management operations (pending applesauce-wallet API)

## Testing

The component:
- Handles missing account gracefully
- Displays appropriate messaging for different states
- Uses proper TypeScript types
- Follows codebase patterns (ProfileViewer, BlossomViewer)
- No TypeScript compilation errors

## Documentation Referenced

- NIP-60 specification: github.com/nostr-protocol/nips/blob/master/60.md
- .claude/skills/nostr/references/nip-60-cashu-wallet.md
- applesauce documentation: hzrd149.github.io/applesauce/

src/components/WalletViewer.tsx

@@ -0,0 +1,440 @@
+import { useEventStore, use$ } from "applesauce-react/hooks";
+import { useGrimoire } from "@/core/state";
+import {
+  Wallet,
+  Lock,
+  Download,
+  AlertCircle,
+  Coins,
+  History,
+} from "lucide-react";
+import { Button } from "@/components/ui/button";
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from "@/components/ui/card";
+import { Alert, AlertDescription } from "@/components/ui/alert";
+import { useMemo, useState } from "react";
+import type { NostrEvent } from "nostr-tools";
+
+export interface WalletViewerProps {
+  pubkey: string;
+}
+
+/**
+ * WalletViewer - NIP-60 Cashu Wallet Display
+ * Shows wallet configuration, balance, and transaction history
+ *
+ * NIP-60 Event Kinds:
+ * - kind:17375 - Wallet config (replaceable, encrypted)
+ * - kind:7375  - Unspent tokens (multiple allowed, encrypted)
+ * - kind:7376  - Transaction history (optional, encrypted)
+ */
+export function WalletViewer({ pubkey }: WalletViewerProps) {
+  const { state } = useGrimoire();
+  const eventStore = useEventStore();
+  const [unlocked, setUnlocked] = useState(false);
+
+  // Resolve $me alias
+  const resolvedPubkey =
+    pubkey === "$me" ? state.activeAccount?.pubkey : pubkey;
+
+  // Fetch wallet config event (kind:17375)
+  const walletConfigEvent = use$(
+    () =>
+      resolvedPubkey
+        ? eventStore.replaceable(17375, resolvedPubkey)
+        : undefined,
+    [resolvedPubkey, eventStore],
+  );
+
+  // Fetch token events (kind:7375)
+  const tokenEvents = use$(
+    () =>
+      resolvedPubkey
+        ? eventStore.timeline([
+            {
+              kinds: [7375],
+              authors: [resolvedPubkey],
+            },
+          ])
+        : undefined,
+    [resolvedPubkey, eventStore],
+  );
+
+  // Fetch history events (kind:7376)
+  const historyEvents = use$(
+    () =>
+      resolvedPubkey
+        ? eventStore.timeline([
+            {
+              kinds: [7376],
+              authors: [resolvedPubkey],
+            },
+          ])
+        : undefined,
+    [resolvedPubkey, eventStore],
+  );
+
+  const isOwnWallet = resolvedPubkey === state.activeAccount?.pubkey;
+
+  // Check if wallet exists
+  const walletExists = walletConfigEvent !== undefined;
+
+  if (!resolvedPubkey) {
+    return (
+      <div className="p-6">
+        <Alert>
+          <AlertCircle className="h-4 w-4" />
+          <AlertDescription>
+            No active account. Please log in to view your wallet.
+          </AlertDescription>
+        </Alert>
+      </div>
+    );
+  }
+
+  if (!walletExists) {
+    return (
+      <div className="p-6 space-y-4">
+        <div className="flex items-center gap-2 text-muted-foreground">
+          <Wallet className="h-5 w-5" />
+          <h2 className="text-lg font-semibold">NIP-60 Cashu Wallet</h2>
+        </div>
+
+        <Alert>
+          <AlertCircle className="h-4 w-4" />
+          <AlertDescription>
+            {isOwnWallet
+              ? "No NIP-60 wallet found for your account. You can create a wallet using a compatible Cashu wallet application."
+              : "No NIP-60 wallet found for this user."}
+          </AlertDescription>
+        </Alert>
+
+        {isOwnWallet && (
+          <Card>
+            <CardHeader>
+              <CardTitle>What is NIP-60?</CardTitle>
+              <CardDescription>
+                NIP-60 is a protocol for storing Cashu ecash wallets on Nostr
+                relays
+              </CardDescription>
+            </CardHeader>
+            <CardContent className="space-y-2 text-sm text-muted-foreground">
+              <p>
+                <strong>Cashu</strong> is a privacy-preserving ecash system
+                backed by Bitcoin via Lightning Network.
+              </p>
+              <p>
+                <strong>NIP-60</strong> stores your wallet data encrypted on
+                Nostr relays, making it accessible across applications.
+              </p>
+              <p className="pt-2">
+                To create a wallet, use a NIP-60 compatible application like{" "}
+                <a
+                  href="https://nostrudel.ninja"
+                  target="_blank"
+                  rel="noopener noreferrer"
+                  className="text-primary hover:underline"
+                >
+                  noStrudel
+                </a>{" "}
+                or{" "}
+                <a
+                  href="https://cashu.me"
+                  target="_blank"
+                  rel="noopener noreferrer"
+                  className="text-primary hover:underline"
+                >
+                  Cashu.me
+                </a>
+                .
+              </p>
+            </CardContent>
+          </Card>
+        )}
+      </div>
+    );
+  }
+
+  return (
+    <div className="p-6 space-y-6">
+      {/* Header */}
+      <div className="flex items-center justify-between">
+        <div className="flex items-center gap-2">
+          <Wallet className="h-5 w-5" />
+          <h2 className="text-lg font-semibold">
+            {isOwnWallet ? "Your" : "User"} Cashu Wallet
+          </h2>
+        </div>
+
+        {!isOwnWallet && (
+          <div className="text-sm text-muted-foreground">
+            Viewing another user's wallet (encrypted)
+          </div>
+        )}
+      </div>
+
+      {/* Wallet Status */}
+      <Card>
+        <CardHeader>
+          <div className="flex items-center justify-between">
+            <CardTitle className="flex items-center gap-2">
+              <Lock className="h-4 w-4" />
+              Wallet Status
+            </CardTitle>
+            {isOwnWallet && !unlocked && (
+              <Button size="sm" variant="outline" disabled>
+                <Download className="h-4 w-4 mr-2" />
+                Unlock Wallet
+              </Button>
+            )}
+          </div>
+          <CardDescription>
+            NIP-60 wallet stored on Nostr relays
+          </CardDescription>
+        </CardHeader>
+        <CardContent className="space-y-4">
+          <Alert>
+            <Lock className="h-4 w-4" />
+            <AlertDescription>
+              {isOwnWallet ? (
+                <>
+                  <strong>Wallet Encrypted:</strong> Your wallet data is
+                  encrypted with NIP-44. Decryption functionality will be added
+                  in a future update.
+                </>
+              ) : (
+                <>
+                  <strong>Privacy Protected:</strong> This wallet's data is
+                  encrypted and cannot be viewed without the owner's private
+                  key.
+                </>
+              )}
+            </AlertDescription>
+          </Alert>
+
+          <div className="grid grid-cols-2 gap-4 text-sm">
+            <div>
+              <div className="text-muted-foreground">Config Event</div>
+              <div className="font-mono text-xs">
+                {walletConfigEvent ? "✓ Found (kind:17375)" : "✗ Not found"}
+              </div>
+            </div>
+            <div>
+              <div className="text-muted-foreground">Token Events</div>
+              <div className="font-mono text-xs">
+                {tokenEvents && tokenEvents.length > 0
+                  ? `✓ ${tokenEvents.length} event(s) (kind:7375)`
+                  : "✗ No tokens"}
+              </div>
+            </div>
+            <div>
+              <div className="text-muted-foreground">History Events</div>
+              <div className="font-mono text-xs">
+                {historyEvents && historyEvents.length > 0
+                  ? `✓ ${historyEvents.length} event(s) (kind:7376)`
+                  : "○ No history"}
+              </div>
+            </div>
+            <div>
+              <div className="text-muted-foreground">Created</div>
+              <div className="font-mono text-xs">
+                {walletConfigEvent
+                  ? new Date(
+                      walletConfigEvent.created_at * 1000,
+                    ).toLocaleDateString()
+                  : "Unknown"}
+              </div>
+            </div>
+          </div>
+        </CardContent>
+      </Card>
+
+      {/* Balance Card (Encrypted) */}
+      <Card>
+        <CardHeader>
+          <CardTitle className="flex items-center gap-2">
+            <Coins className="h-4 w-4" />
+            Balance
+          </CardTitle>
+          <CardDescription>
+            Total unspent tokens across all mints
+          </CardDescription>
+        </CardHeader>
+        <CardContent>
+          <div className="flex items-center justify-center p-8 border-2 border-dashed rounded-lg">
+            <div className="text-center space-y-2">
+              <Lock className="h-8 w-8 mx-auto text-muted-foreground" />
+              <p className="text-sm text-muted-foreground">Balance encrypted</p>
+              <p className="text-xs text-muted-foreground">
+                {tokenEvents && tokenEvents.length > 0
+                  ? `${tokenEvents.length} token event(s) found`
+                  : "No token events"}
+              </p>
+            </div>
+          </div>
+        </CardContent>
+      </Card>
+
+      {/* Transaction History (Encrypted) */}
+      <Card>
+        <CardHeader>
+          <CardTitle className="flex items-center gap-2">
+            <History className="h-4 w-4" />
+            Transaction History
+          </CardTitle>
+          <CardDescription>Recent wallet activity</CardDescription>
+        </CardHeader>
+        <CardContent>
+          {historyEvents && historyEvents.length > 0 ? (
+            <div className="flex items-center justify-center p-8 border-2 border-dashed rounded-lg">
+              <div className="text-center space-y-2">
+                <Lock className="h-8 w-8 mx-auto text-muted-foreground" />
+                <p className="text-sm text-muted-foreground">
+                  Transaction history encrypted
+                </p>
+                <p className="text-xs text-muted-foreground">
+                  {historyEvents.length} transaction(s) found
+                </p>
+              </div>
+            </div>
+          ) : (
+            <div className="text-center py-8 text-muted-foreground">
+              <History className="h-8 w-8 mx-auto mb-2 opacity-50" />
+              <p className="text-sm">No transaction history</p>
+            </div>
+          )}
+        </CardContent>
+      </Card>
+
+      {/* Developer Info */}
+      {isOwnWallet && (
+        <Card>
+          <CardHeader>
+            <CardTitle className="text-sm">
+              Raw Events (For Developers)
+            </CardTitle>
+          </CardHeader>
+          <CardContent className="space-y-2">
+            <details>
+              <summary className="cursor-pointer text-sm font-medium">
+                Wallet Config Event (kind:17375)
+              </summary>
+              <pre className="mt-2 text-xs bg-muted p-3 rounded overflow-x-auto">
+                {walletConfigEvent
+                  ? JSON.stringify(walletConfigEvent, null, 2)
+                  : "Not found"}
+              </pre>
+            </details>
+
+            {tokenEvents && tokenEvents.length > 0 && (
+              <details>
+                <summary className="cursor-pointer text-sm font-medium">
+                  Token Events (kind:7375) - {tokenEvents.length} event(s)
+                </summary>
+                <pre className="mt-2 text-xs bg-muted p-3 rounded overflow-x-auto">
+                  {JSON.stringify(tokenEvents, null, 2)}
+                </pre>
+              </details>
+            )}
+
+            {historyEvents && historyEvents.length > 0 && (
+              <details>
+                <summary className="cursor-pointer text-sm font-medium">
+                  History Events (kind:7376) - {historyEvents.length} event(s)
+                </summary>
+                <pre className="mt-2 text-xs bg-muted p-3 rounded overflow-x-auto">
+                  {JSON.stringify(historyEvents, null, 2)}
+                </pre>
+              </details>
+            )}
+          </CardContent>
+        </Card>
+      )}
+
+      {/* Help Section */}
+      <Card>
+        <CardHeader>
+          <CardTitle className="text-sm">About NIP-60 Cashu Wallets</CardTitle>
+        </CardHeader>
+        <CardContent className="space-y-3 text-sm text-muted-foreground">
+          <div>
+            <strong className="text-foreground">What you're seeing:</strong>
+            <ul className="list-disc list-inside mt-1 space-y-1">
+              <li>
+                kind:17375 - Encrypted wallet configuration (mint URLs, wallet
+                private key)
+              </li>
+              <li>kind:7375 - Encrypted unspent Cashu proofs (ecash tokens)</li>
+              <li>kind:7376 - Encrypted transaction history (optional)</li>
+            </ul>
+          </div>
+
+          <div>
+            <strong className="text-foreground">Privacy & Security:</strong>
+            <ul className="list-disc list-inside mt-1 space-y-1">
+              <li>All wallet data is encrypted with NIP-44</li>
+              <li>Only the owner can decrypt and spend the funds</li>
+              <li>Wallet follows you across Nostr applications</li>
+            </ul>
+          </div>
+
+          <div>
+            <strong className="text-foreground">Compatible Apps:</strong>
+            <ul className="list-disc list-inside mt-1 space-y-1">
+              <li>
+                <a
+                  href="https://nostrudel.ninja"
+                  target="_blank"
+                  rel="noopener noreferrer"
+                  className="text-primary hover:underline"
+                >
+                  noStrudel
+                </a>{" "}
+                - Full-featured Nostr client with NIP-60 wallet
+              </li>
+              <li>
+                <a
+                  href="https://cashu.me"
+                  target="_blank"
+                  rel="noopener noreferrer"
+                  className="text-primary hover:underline"
+                >
+                  Cashu.me
+                </a>{" "}
+                - Cashu ecash wallet
+              </li>
+            </ul>
+          </div>
+
+          <div className="pt-2 border-t">
+            <p className="text-xs">
+              📚 Learn more:{" "}
+              <a
+                href="https://github.com/nostr-protocol/nips/blob/master/60.md"
+                target="_blank"
+                rel="noopener noreferrer"
+                className="text-primary hover:underline"
+              >
+                NIP-60 Specification
+              </a>
+              {" | "}
+              <a
+                href="https://cashu.space"
+                target="_blank"
+                rel="noopener noreferrer"
+                className="text-primary hover:underline"
+              >
+                Cashu Protocol
+              </a>
+            </p>
+          </div>
+        </CardContent>
+      </Card>
+    </div>
+  );
+}

src/components/WindowRenderer.tsx

@@ -42,6 +42,9 @@ const SpellbooksViewer = lazy(() =>
 const BlossomViewer = lazy(() =>
   import("./BlossomViewer").then((m) => ({ default: m.BlossomViewer })),
 );
+const WalletViewer = lazy(() =>
+  import("./WalletViewer").then((m) => ({ default: m.WalletViewer })),
+);
 
 // Loading fallback component
 function ViewerLoading() {
@@ -210,6 +213,9 @@ export function WindowRenderer({ window, onClose }: WindowRendererProps) {
           />
         );
         break;
+      case "wallet":
+        content = <WalletViewer pubkey={window.props.pubkey} />;
+        break;
       default:
         content = (
           <div className="p-4 text-muted-foreground">