fix(settings): invalidate in-flight discovery on baseUrl clear

Bump discoverySeq when scheduleDiscovery returns early due to an
invalid baseUrl. Otherwise a slow probe started before the user
cleared the field can still resolve and overwrite the freshly-reset
`idle` state back to `found`/`failed`.

Signed-off-by: hqhq1025 <1506751656@qq.com>

Author: hqhq1025

apps/desktop/src/renderer/src/components/AddCustomProviderModal.tsx

@@ -113,6 +113,7 @@ export function AddCustomProviderModal({
   function scheduleDiscovery(currentBaseUrl: string, currentWire: WireApi) {
     if (debounceTimer.current !== null) clearTimeout(debounceTimer.current);
     if (!currentBaseUrl.trim().match(/^https?:\/\//)) {
+      discoverySeq.current += 1;
       setDiscovery({ kind: 'idle' });
       return;
     }