make settings esc button navigate back to app rather than back page (#1607)

frontend/src/hooks/usePreviousPath.ts

@@ -0,0 +1,28 @@
+import { useCallback, useEffect } from 'react';
+import { useLocation, useNavigate } from 'react-router-dom';
+
+const globalVisited: string[] = [];
+
+export function usePreviousPath() {
+  const navigate = useNavigate();
+  const location = useLocation();
+
+  // Track pathnames as user navigates
+  useEffect(() => {
+    if (globalVisited[globalVisited.length - 1] !== location.pathname) {
+      globalVisited.push(location.pathname);
+      // Keep only last 50 entries to prevent memory bloat
+      if (globalVisited.length > 50) {
+        globalVisited.splice(0, globalVisited.length - 50);
+      }
+    }
+  }, [location]);
+
+  return useCallback(() => {
+    // Find last non-settings route in history
+    const lastNonSettingsPath = [...globalVisited]
+      .reverse()
+      .find((p) => !p.startsWith('/settings'));
+    navigate(lastNonSettingsPath || '/');
+  }, [navigate]);
+}