feat(cluster): feed the locator store from PSK Reporter, filtered at the broker

The store shipped without its main source. Locators came only from this
station's own WSJT-X decodes, which is what the whole MQTT discussion was
about.

PSK Reporter now feeds it through a new OnGrid callback, fired before any
geographic filtering: what the store wants is "which square is this callsign
in", and that is true whoever happened to hear the report.

The subscription filters on the RECEIVER's square, a level the v2 topic
exposes. Measured on the live feed: the four opening bands unfiltered are 83
messages a second, of which roughly one in a hundred survived the NearKm test
that already existed here — the rest was received, TLS-decrypted, JSON-parsed
and discarded. One ring of squares is 0.2 to 1.2 a second.

By square rather than by DXCC, which was the obvious alternative: one country
measured 1.2 messages a second (OH) against 72.5 (K) on a single band, because
a DXCC can be a continent. By square the same measurement is 0.2 to 1.2, so the
load follows distance — what the feed is actually about — and is the same for
every operator.

Grid chasing subscribes with the "+" band wildcard, so one subscription per
square covers every band instead of one per band per square.

The store gains a source column (decode | mqtt), migrated in place on an
existing file.

frontend/src/components/SettingsModal.tsx

@@ -52,7 +52,7 @@ import {
   GetADIFMonitor, SaveADIFMonitor, PickADIFMonitorFile,
   GetRelayAuto, SaveRelayAuto, GetStationDevices,
   GetAwardDefs, GetTrackedAwards, SaveTrackedAwards,
-  GetBandOpenSettings, SaveBandOpenSettings, GetPSKReporterStatus, GetChaseNewGrids, SetChaseNewGrids,
+  GetBandOpenSettings, SaveBandOpenSettings, GetPSKReporterStatus, GetChaseNewGrids, SetChaseNewGrids, GetGridCacheStatus,
 } from '../../wailsjs/go/main/App';
 import type { profile as profileModels } from '../../wailsjs/go/models';
 import type { LookupSettingsForm, StationSettingsForm, ListsSettingsForm, ModePresetForm } from '@/types';
@@ -1553,6 +1553,7 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
   // feed up or down — so the write has to go where those live.
   const [bandOpen, setBandOpen] = useState<any>({ enabled: false, bands: [], available: [] });
   const [chaseGrids, setChaseGrids] = useState(false);
+  const [gridStat, setGridStat] = useState<any>(null);
   const [pskrStatus, setPskrStatus] = useState<any>(null);
   const saveBandOpen = async (next: any) => {
     setBandOpen(next);
@@ -1567,6 +1568,7 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
     // distinguishes "connected" from "connected and receiving nothing".
     const t = window.setInterval(async () => {
       try { setPskrStatus(await GetPSKReporterStatus()); } catch { /* ignore */ }
+      try { setGridStat(await GetGridCacheStatus()); } catch { /* ignore */ }
     }, 3000);
     return () => window.clearInterval(t);
   }, []);
@@ -4238,6 +4240,12 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
                 onCheckedChange={(c) => { setChaseGrids(!!c); SetChaseNewGrids(!!c).catch(() => {}); }} />
               <span>{t('clu.chaseGrids')} <span className="text-xs text-muted-foreground">{t('clu.chaseGridsHint')}</span></span>
             </label>
+            {chaseGrids && (
+              <p className="pl-6 text-xs text-muted-foreground">
+                {t('clu.chaseGridsStat', { n: gridStat?.known ?? 0, p: gridStat?.pending ?? 0 })}
+                {pskrStatus?.running ? ` · ${t('bo.feedUp', { n: pskrStatus.received ?? 0 })}` : ''}
+              </p>
+            )}
           </div>
 
           {/* Band-opening watch. It lives HERE, with the cluster nodes, because

frontend/src/lib/i18n.tsx

@@ -270,7 +270,7 @@ const en: Dict = {
   'clu.muteWorkedHint': '(they stay in the list, just quiet — leaves the colour for what is left to do)',
   'clu.slotHighlight': 'Colour the stations not worked on this band and mode',
   'clu.slotHighlightHint': '(by callsign, whatever the entity status says)',
-  'bo.open': 'open', 'bo.liveTip': '{band} is open — {n} stations, ~{km} km, {sector}{season}. Click for the band map.', 'bo.enable': 'Watch for band openings', 'bo.enableHint': '(10, 12, 6, 4 and 2 m. Switching this on adds the two RBN nodes and subscribes to the PSK Reporter feed — the detection needs far more ears than a cluster can give it.)', 'bo.feedUp': 'PSK Reporter feed up — {n} decodes seen', 'bo.feedDown': 'PSK Reporter feed down — needs your station grid, and a moment to connect', 'clu.chaseGrids': 'Chase new grids', 'clu.chaseGridsHint': '(keeps the locators learnt from WSJT-X decodes in their own database, so the cluster shows them from the first second instead of after an hour of listening)', 'clu.workedSameSlot': 'Already worked only on the same slot',
+  'bo.open': 'open', 'bo.liveTip': '{band} is open — {n} stations, ~{km} km, {sector}{season}. Click for the band map.', 'bo.enable': 'Watch for band openings', 'bo.enableHint': '(10, 12, 6, 4 and 2 m. Switching this on adds the two RBN nodes and subscribes to the PSK Reporter feed — the detection needs far more ears than a cluster can give it.)', 'bo.feedUp': 'PSK Reporter feed up — {n} decodes seen', 'bo.feedDown': 'PSK Reporter feed down — needs your station grid, and a moment to connect', 'clu.chaseGrids': 'Chase new grids', 'clu.chaseGridsHint': '(learns locators from your own WSJT-X decodes AND from PSK Reporter, and keeps them in their own database so the cluster shows them from the first second)', 'clu.chaseGridsStat': '{n} locators known — {p} waiting to be written', 'clu.workedSameSlot': 'Already worked only on the same slot',
   'clu.workedSameSlotHint': '— a spot shows "worked" only if you worked that call on the SAME band and mode, not just anywhere. Combines with digital-mode grouping (Settings → General): with it on, a call worked on 20m FT8 also counts as worked for a 20m FT4 spot; with it off, FT8 and FT4 are separate slots.',
   // Backup panel
   'bk.hintMysql': 'On close (once/day) OpsLog snapshots the local SQLite (config) AND exports the shared MySQL log to ADIF — opslog-log-<date>.adi — so your contacts are protected even though they live on the server. Rotation keeps the last N of each.',

frontend/wailsjs/go/main/App.d.ts

@@ -442,6 +442,8 @@ export function GetFlexBandPower():Promise<Record<string, main.FlexBandPower>>;
 
 export function GetFlexState():Promise<cat.FlexTXState>;
 
+export function GetGridCacheStatus():Promise<main.GridCacheStatus>;
+
 export function GetIcomState():Promise<cat.IcomTXState>;
 
 export function GetListsSettings():Promise<main.ListsSettings>;

frontend/wailsjs/go/main/App.js

@@ -826,6 +826,10 @@ export function GetFlexState() {
   return window['go']['main']['App']['GetFlexState']();
 }
 
+export function GetGridCacheStatus() {
+  return window['go']['main']['App']['GetGridCacheStatus']();
+}
+
 export function GetIcomState() {
   return window['go']['main']['App']['GetIcomState']();
 }

frontend/wailsjs/go/models.ts

@@ -2419,6 +2419,22 @@ export namespace main {
 	        this.body = source["body"];
 	    }
 	}
+	export class GridCacheStatus {
+	    enabled: boolean;
+	    known: number;
+	    pending: number;
+	
+	    static createFrom(source: any = {}) {
+	        return new GridCacheStatus(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.enabled = source["enabled"];
+	        this.known = source["known"];
+	        this.pending = source["pending"];
+	    }
+	}
 	export class ModePreset {
 	    name: string;
 	    default_rst_sent?: string;