feat(chase): the global hunt — new, or new plus unconfirmed, every category

The gap between worked and confirmed becomes visible everywhere. A Chase
setting on the DX Cluster page picks the mode; in new-plus-unconfirmed the
verdicts for DXCC/band/mode/slot, prefix, county and state are judged against
CONFIRMED-only ledgers built from the operator's chosen sources (LoTW, card,
eQSL, QRZ.com — HRDLog has no confirmation field in ADIF to offer), and a
need that exists only because a QSL never arrived is flagged Unconf: the
cluster and decode badges render it dimmed, the convention the grid hunt
introduced. The grid's own Chase selector folds into the global one; its
square-matching scope stays where it was, being grid-specific. One snapshot
key change rebuilds the cache when any of it flips.

frontend/wailsjs/go/main/App.js

@@ -842,6 +842,10 @@ export function GetChaseNewSpots() {
   return window['go']['main']['App']['GetChaseNewSpots']();
 }
 
+export function GetChaseSettings() {
+  return window['go']['main']['App']['GetChaseSettings']();
+}
+
 export function GetChatHistory(arg1) {
   return window['go']['main']['App']['GetChatHistory'](arg1);
 }
@@ -1994,6 +1998,10 @@ export function SaveCabrilloFile() {
   return window['go']['main']['App']['SaveCabrilloFile']();
 }
 
+export function SaveChaseSettings(arg1) {
+  return window['go']['main']['App']['SaveChaseSettings'](arg1);
+}
+
 export function SaveClusterServer(arg1) {
   return window['go']['main']['App']['SaveClusterServer'](arg1);
 }