fix(amber): stop re-decrypting on every navigation

Root cause: Layout is NOT a router layout — ~62 pages wrap themselves in
<Layout>, so its chrome remounts on every route change. The header's
NotificationBell -> useNotificationsRead -> useReadState -> useSyncedAppData
re-decrypts an encrypted kind-30078 event on mount; with Amber (NIP-55) every
nip44.decrypt opens the signer app, so it popped on each menu click.

Fix: for interactive signers, decrypt once per session and serve remounts from
cache (staleTime/gcTime Infinity, refetchOnMount/refetchOnReconnect false) in
useSyncedAppData and useStash. Non-interactive signers refetch as before.

Follow-up (noted in AGENTS.md): hoist Layout into the router so the chrome mounts
once — removes the whole remount class (and SasquatchGuide state resets).

AGENTS.md

@@ -150,6 +150,13 @@ session with **no other memory of this project**. So:
   MOTIS 2, open CORS) — note origin/destination go to that service, unlike road
   modes. **No external map-app handoff anywhere** (product decision) and no
   scooter/moped profile.
+- **⚠️ `Layout` is NOT a router layout** — ~62 pages wrap themselves in
+  `<Layout>`, so its chrome (`NotificationBell`, `SasquatchGuide`, nav) **remounts
+  on every navigation**. Consequence: any *decrypt-on-mount* hook in that chrome
+  re-opens Amber (NIP-55) on every page change. Encrypted hooks must be gated for
+  interactive signers: `staleTime/gcTime: Infinity`, `refetchOnMount: false`,
+  `refetchOnReconnect: false` (see `useSyncedAppData` / `useStash`). Hoisting
+  `Layout` into the router would fix the whole class — a known follow-up.
 - **Mints directory**: `/mints` page lists Cashu mints from the community
   **MintRadar** project. MintRadar has **no CORS**, so it's fetched same-origin
   at `/api/mints/*` — prod proxies via `public/_redirects` (`/api/mints/* →

src/hooks/useStash.ts

@@ -110,7 +110,12 @@ export function useStash(options?: { enabled?: boolean }) {
     },
     enabled: callerEnabled && !!user?.pubkey && hasNip44,
     staleTime: interactive ? Infinity : 60000,
+    // Keep the decrypted stash in memory for the session so navigating away and
+    // back doesn't re-open Amber (gcTime would otherwise evict it after 5 min).
+    gcTime: interactive ? Infinity : undefined,
+    refetchOnMount: !interactive,
     refetchOnWindowFocus: false,
+    refetchOnReconnect: !interactive,
   });
 
   /**

src/hooks/useSyncedAppData.ts

@@ -4,7 +4,7 @@ import { useNostr } from '@nostrify/react';
 import { useNostrLogin } from '@nostrify/react/login';
 import { useCurrentUser } from './useCurrentUser';
 import { useNostrPublish } from './useNostrPublish';
-import { hasNip44 as checkNip44 } from '@/lib/signerCapabilities';
+import { hasNip44 as checkNip44, isInteractiveSigner } from '@/lib/signerCapabilities';
 
 /**
  * useSyncedAppData — a small engine for storing a blob of app state as ONE
@@ -68,6 +68,14 @@ export function useSyncedAppData<T>(options: UseSyncedAppDataOptions<T>) {
   const hasNip44 = useMemo(() => checkNip44(user, logins), [user, logins]);
   const canSync = !!user?.pubkey && hasNip44;
 
+  // Amber (NIP-55) opens the signer app on EVERY nip44 decrypt. This engine is
+  // used by chrome that is mounted per page (e.g. the notification bell's read
+  // state), so re-decrypting on every navigation spams Amber popups. For an
+  // interactive signer, decrypt once per session and keep it cached — remounts
+  // read the cache instead of prompting. (Non-interactive signers are cheap, so
+  // they keep normal refetching.)
+  const interactive = isInteractiveSigner(user, logins);
+
   const queryKey = useMemo(
     () => ['synced-app-data', dTag, user?.pubkey] as const,
     [dTag, user?.pubkey],
@@ -77,8 +85,13 @@ export function useSyncedAppData<T>(options: UseSyncedAppDataOptions<T>) {
   const { data, isLoading } = useQuery({
     queryKey,
     enabled: enabled && canSync,
-    staleTime: 60_000,
+    // For interactive signers: never consider it stale and never evict it from
+    // memory during the session → one decrypt, then cache hits.
+    staleTime: interactive ? Infinity : 60_000,
+    gcTime: interactive ? Infinity : undefined,
+    refetchOnMount: !interactive,
     refetchOnWindowFocus: false,
+    refetchOnReconnect: !interactive,
     queryFn: async ({ signal }): Promise<T> => {
       if (!user?.pubkey || !hasNip44) return empty;