fix(ui): kill console spam — pine/mempool icon 404s + filebrowser 401 loop

pine/mempool get explicit icon entries (their extensions aren't .png, so
the default guess 404'd on every render). filebrowser-client: central
authedFetch does ONE transparent re-login when the short-lived JWT
expires (an expired cookie previously kept _authenticated=true and every
Files-card poll 401'd forever), plus a 60s login cooldown so a missing
filebrowser doesn't spam either.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/src/views/apps/appsConfig.ts

@@ -181,6 +181,12 @@ export function opensInTab(id: string): boolean {
 // are explicit because icon extensions vary (.png / .webp / .svg).
 const APP_ICON_FALLBACKS: Record<string, string> = {
   gitea: '/assets/img/app-icons/gitea.svg',
+  // Apps whose icon extension isn't .png: without an explicit entry the
+  // default `<id>.png` guess 404s on every render (console spam, and for
+  // mempool the .png→.svg fallback chain 404s TWICE before giving up).
+  pine: '/assets/img/app-icons/pine.svg',
+  mempool: '/assets/img/app-icons/mempool.webp',
+  'mempool-web': '/assets/img/app-icons/mempool.webp',
   'fedimint-gateway': '/assets/img/app-icons/fedimint.png',
   'fedimint-clientd': '/assets/img/app-icons/fedimint.png',
   // immich stack