feat: improve multi-account UX and read-only account handling

Account Management Improvements:
- Auto-switch to another account when logging out (instead of leaving no active account)
- If other accounts exist, automatically activates the first one before removing current

Account Type Badges:
- Added visual badges to distinguish account types in user menu
- 'Read-only' badge with eye icon for read-only accounts
- 'Extension' badge with puzzle icon for extension accounts
- Badges appear in both user menu and account manager

Auth Prompt Protection:
- Read-only accounts no longer receive relay auth prompts
- Auto-reject all auth challenges when active account is read-only
- Prevents confusing prompts for accounts that cannot sign

Type Safety:
- Proper TypeScript casting for account.constructor.type access
- Used 'as unknown as { type: string }' pattern for type narrowing

src/components/AccountManager.tsx

@@ -1,17 +1,42 @@
 import { useObservableMemo } from "applesauce-react/hooks";
-import { Check, User, UserX, UserPlus } from "lucide-react";
+import { Check, User, UserX, UserPlus, Eye, Puzzle } from "lucide-react";
 import { toast } from "sonner";
 import accountManager from "@/services/accounts";
 import { useProfile } from "@/hooks/useProfile";
 import { getDisplayName } from "@/lib/nostr-utils";
 import { useAppShell } from "@/components/layouts/AppShellContext";
 import { Button } from "@/components/ui/button";
+import { Badge } from "@/components/ui/badge";
 import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 import Nip05 from "@/components/nostr/nip05";
 import type { IAccount } from "applesauce-accounts";
 import type { ISigner } from "applesauce-signers";
 
+function getAccountTypeBadge(account: IAccount<ISigner, unknown, unknown>) {
+  const accountType = (account.constructor as unknown as { type: string }).type;
+
+  if (accountType === "grimoire-readonly" || accountType === "readonly") {
+    return (
+      <Badge variant="secondary" className="text-xs">
+        <Eye className="size-3 mr-1" />
+        Read-only
+      </Badge>
+    );
+  }
+
+  if (accountType === "extension") {
+    return (
+      <Badge variant="secondary" className="text-xs">
+        <Puzzle className="size-3 mr-1" />
+        Extension
+      </Badge>
+    );
+  }
+
+  return null;
+}
+
 function AccountCard({
   account,
   isActive,
@@ -56,7 +81,10 @@ function AccountCard({
               </AvatarFallback>
             </Avatar>
             <div className="flex-1 min-w-0">
-              <div className="font-medium truncate">{displayName}</div>
+              <div className="flex items-center gap-2 mb-1">
+                <div className="font-medium truncate">{displayName}</div>
+                {getAccountTypeBadge(account)}
+              </div>
               {profile && (
                 <div className="text-xs text-muted-foreground">
                   <Nip05 pubkey={account.pubkey} profile={profile} />

src/components/GlobalAuthPrompt.tsx

@@ -5,6 +5,8 @@ import { Button } from "./ui/button";
 import { Checkbox } from "./ui/checkbox";
 import { useRelayState } from "@/hooks/useRelayState";
 import { RelayLink } from "./nostr/RelayLink";
+import { useObservableMemo } from "applesauce-react/hooks";
+import accountManager from "@/services/accounts";
 
 interface AuthToastProps {
   relayUrl: string;
@@ -116,11 +118,20 @@ export function GlobalAuthPrompt() {
     relays,
   } = useRelayState();
 
+  const activeAccount = useObservableMemo(() => accountManager.active$, []);
   const activeToasts = useRef<Map<string, string | number>>(new Map());
   const [authenticatingRelays, setAuthenticatingRelays] = useState<Set<string>>(
     new Set(),
   );
 
+  // Check if active account is read-only
+  const isReadOnly =
+    activeAccount &&
+    ((activeAccount.constructor as unknown as { type: string }).type ===
+      "grimoire-readonly" ||
+      (activeAccount.constructor as unknown as { type: string }).type ===
+        "readonly");
+
   // Watch for authentication success and show toast
   useEffect(() => {
     authenticatingRelays.forEach((relayUrl) => {
@@ -139,6 +150,15 @@ export function GlobalAuthPrompt() {
   }, [relays, authenticatingRelays]);
 
   useEffect(() => {
+    // Don't show auth prompts if active account is read-only
+    if (isReadOnly) {
+      // Auto-reject all pending challenges for read-only accounts
+      pendingChallenges.forEach((challenge) => {
+        rejectAuth(challenge.relayUrl, true);
+      });
+      return;
+    }
+
     // Show toasts for new challenges
     pendingChallenges.forEach((challenge) => {
       const key = challenge.relayUrl;
@@ -224,7 +244,13 @@ export function GlobalAuthPrompt() {
         activeToasts.current.delete(relayUrl);
       }
     });
-  }, [pendingChallenges, authenticateRelay, rejectAuth, setAuthPreference]);
+  }, [
+    pendingChallenges,
+    authenticateRelay,
+    rejectAuth,
+    setAuthPreference,
+    isReadOnly,
+  ]);
 
   return null; // No UI needed - toasts handle everything
 }

src/components/LogoutHandler.tsx

@@ -61,6 +61,15 @@ export default function LogoutHandler({ action, all }: LogoutHandlerProps) {
           return;
         }
 
+        // If there are other accounts, switch to the first one before removing current
+        const otherAccounts = allAccounts.filter(
+          (acc) => acc.id !== activeAccount.id,
+        );
+        if (otherAccounts.length > 0) {
+          accountManager.setActive(otherAccounts[0].id);
+        }
+
+        // Remove the account
         accountManager.removeAccount(activeAccount);
 
         toast.success("Logged out", {

src/components/nostr/user-menu.tsx

@@ -1,4 +1,4 @@
-import { User, Check, UserPlus } from "lucide-react";
+import { User, Check, UserPlus, Eye, Puzzle } from "lucide-react";
 import accounts from "@/services/accounts";
 import { ExtensionSigner } from "applesauce-signers";
 import { ExtensionAccount } from "applesauce-accounts/accounts";
@@ -8,6 +8,7 @@ import { getDisplayName } from "@/lib/nostr-utils";
 import { useGrimoire } from "@/core/state";
 import { useAppShell } from "@/components/layouts/AppShellContext";
 import { Button } from "@/components/ui/button";
+import { Badge } from "@/components/ui/badge";
 import {
   DropdownMenu,
   DropdownMenuContent,
@@ -25,6 +26,30 @@ import { useState } from "react";
 import type { IAccount } from "applesauce-accounts";
 import type { ISigner } from "applesauce-signers";
 
+function getAccountTypeBadge(account: IAccount<ISigner, unknown, unknown>) {
+  const accountType = (account.constructor as unknown as { type: string }).type;
+
+  if (accountType === "grimoire-readonly" || accountType === "readonly") {
+    return (
+      <Badge variant="secondary" className="text-xs">
+        <Eye className="size-3 mr-1" />
+        Read-only
+      </Badge>
+    );
+  }
+
+  if (accountType === "extension") {
+    return (
+      <Badge variant="secondary" className="text-xs">
+        <Puzzle className="size-3 mr-1" />
+        Extension
+      </Badge>
+    );
+  }
+
+  return null;
+}
+
 function UserAvatar({ pubkey }: { pubkey: string }) {
   const profile = useProfile(pubkey);
   return (
@@ -40,14 +65,21 @@ function UserAvatar({ pubkey }: { pubkey: string }) {
   );
 }
 
-function UserLabel({ pubkey }: { pubkey: string }) {
-  const profile = useProfile(pubkey);
+function UserLabel({
+  account,
+}: {
+  account: IAccount<ISigner, unknown, unknown>;
+}) {
+  const profile = useProfile(account.pubkey);
   return (
-    <div className="flex flex-col gap-0">
-      <span className="text-sm">{getDisplayName(pubkey, profile)}</span>
+    <div className="flex flex-col gap-1">
+      <div className="flex items-center gap-2">
+        <span className="text-sm">{getDisplayName(account.pubkey, profile)}</span>
+        {getAccountTypeBadge(account)}
+      </div>
       {profile ? (
         <span className="text-xs text-muted-foreground">
-          <Nip05 pubkey={pubkey} profile={profile} />
+          <Nip05 pubkey={account.pubkey} profile={profile} />
         </span>
       ) : null}
     </div>
@@ -128,7 +160,7 @@ export default function UserMenu() {
                 >
                   <div className="flex items-center gap-2">
                     <Check className="size-4 text-primary" />
-                    <UserLabel pubkey={account.pubkey} />
+                    <UserLabel account={account} />
                   </div>
                 </DropdownMenuLabel>
               </DropdownMenuGroup>
@@ -149,7 +181,7 @@ export default function UserMenu() {
                       >
                         <div className="flex items-center gap-2">
                           <UserAvatar pubkey={acc.pubkey} />
-                          <UserLabel pubkey={acc.pubkey} />
+                          <UserLabel account={acc} />
                         </div>
                       </DropdownMenuItem>
                     ))}