chore(integration): document cache purge intent

apps/client/src/features/integration/queries/integration-query.ts

@@ -105,7 +105,7 @@ export function useDisconnectIntegration() {
         queryKey: ["integration-connection", variables.integrationId],
       });
       qc.invalidateQueries({ queryKey: ["my-connections"] });
-      // removeQueries, not invalidate: refetchOnMount false would revive stale entries
+      // removeQueries, not invalidate: refetchOnMount false leaves invalidated inactive queries unrefreshed
       qc.removeQueries({ queryKey: ["unfurl"] });
     },
     onError: (error) => {

apps/server/src/core/integration/unfurl/unfurl.service.ts

@@ -123,6 +123,7 @@ export class UnfurlService {
         }
       }
     } catch (err) {
+      // best-effort by design: never fail a disconnect on cache purge; the TTL is the backstop
       this.logger.error(
         `Failed to purge unfurl cache for user ${userId}: ${(err as Error).message}`,
       );