Threema UX: static file middleware fix, *AIAGENT display, info banner

src/middleware.ts

@@ -40,5 +40,10 @@ export default async function middleware(request: NextRequest) {
 }
 
 export const config = {
-  matcher: ["/((?!_next|favicon.ico|api).*)"],
+  // Excludes _next/* internal routes, the favicon, api routes, AND any
+  // path containing a dot (covers all static files served from public/,
+  // e.g. /threema/qr_code_AIAGENT.png). Without the dot exclusion, the
+  // i18n middleware prepends the locale ("/en/threema/qr_code_AIAGENT.png")
+  // and the file is not found.
+  matcher: ["/((?!_next|favicon.ico|api|.*\\..*).*)"],
 };