feat(entry): NEW badge on the county in the entry strip

The same answer the Details tab already gave, moved to where the county is now
typed — a badge in a tab nobody has open while working a station is a badge
that does not do its job.

Debounced at 300 ms and keyed on state + county together: the field is typed
into as well as filled by the lookup, and the check queries the log. A county
name means nothing without its state, so both have to settle before asking.

frontend/src/App.tsx

@@ -91,7 +91,7 @@ import { ShutdownProgress } from '@/components/ShutdownProgress';
 import { ClusterGrid } from '@/components/ClusterGrid';
 import { cleanSpotter, inferSpotMode, spotModeCategory, spotStatusKey } from '@/lib/spot';
 import { applySpotDisplay, readSpotDisplayOptions, spotIsWorked, SPOT_DISPLAY_OPTIONS_EXPOSED } from '@/lib/spotDisplay';
-import { GetRowColors, GetSpotTTLMinutes } from '../wailsjs/go/main/App';
+import { GetRowColors, GetSpotTTLMinutes, IsNewUSCounty } from '../wailsjs/go/main/App';
 import { WorkedBeforeGrid } from '@/components/WorkedBeforeGrid';
 import { NetControlPanel } from '@/components/NetControlPanel';
 import { ContestPanel, CONTEST_DEFAULT, type ContestSession } from '@/components/ContestPanel';
@@ -4459,6 +4459,23 @@ export default function App() {
   // A numeric field stores undefined when cleared, not 0: zero is a real DXCC
   // number for "no entity" and a real answer for a zone, so an empty box must
   // stay empty rather than assert something.
+  // NEW badge on the county — the same answer the Details tab gives, moved to
+  // where the county is now typed. Debounced: this field is typed into as well
+  // as filled by the lookup, and the check hits the database.
+  const [entryNewCounty, setEntryNewCounty] = useState(false);
+  useEffect(() => {
+    const cnty = (details.cnty ?? '').trim();
+    if (!cnty) { setEntryNewCounty(false); return; }
+    let alive = true;
+    const id = window.setTimeout(async () => {
+      try {
+        const isNew = await IsNewUSCounty(details.state ?? '', cnty);
+        if (alive) setEntryNewCounty(!!isNew);
+      } catch { if (alive) setEntryNewCounty(false); }
+    }, 300);
+    return () => { alive = false; window.clearTimeout(id); };
+  }, [details.state, details.cnty]);
+
   const num = (v: string): number | undefined => {
     const s = v.replace(/[^0-9]/g, '');
     return s === '' ? undefined : parseInt(s, 10);