feat(rda): measure the two district sources before arbitrating between them

A log imported from HAMLOG.online carries the Russian district in CNTY, and the
offline RDA database has its own answer for the same contact. Which wins is a
real question — but only if the two are independent. If HAMLOG's value is itself
a lookup in the same kind of database, there is nothing to arbitrate and a
precedence rule would be ceremony around a redundancy.

So this measures instead of deciding: Settings → RDA gains a read-only compare
that reports agreements, disagreements, and the contacts where only one side
knows, then lists the disagreements — callsign, date, both districts, whether
the database answer was a DATED record (the award administrators' own fact) or
the callsign's current district (an assumption), and whether the QSO is
confirmed on HAMLOG (their value has then been through a match of two logs).

It changes nothing in the log. What to do about a conflict is the next decision,
and it should be taken with the operator's own numbers in hand.

Also: the four HAMLOG fields become filterable, so 'never sent there' is a
filter rather than a guess. A field that can be written and not read back is
half a feature — pinned by a test against the bulk-editable list.

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

@@ -127,6 +127,8 @@ export function ClusterSpotStatuses(arg1:Array<main.SpotQuery>):Promise<Array<ma
 
 export function CompactDatabase(arg1:string):Promise<main.CompactResult>;
 
+export function CompareRDASources():Promise<main.RDACompareResult>;
+
 export function ComputeQSOAwardRefs(arg1:qso.QSO):Promise<Array<main.QSOAwardRef>>;
 
 export function ComputeStationInfo(arg1:string,arg2:string):Promise<main.StationInfoComputed>;

frontend/wailsjs/go/main/App.js

@@ -194,6 +194,10 @@ export function CompactDatabase(arg1) {
   return window['go']['main']['App']['CompactDatabase'](arg1);
 }
 
+export function CompareRDASources() {
+  return window['go']['main']['App']['CompareRDASources']();
+}
+
 export function ComputeQSOAwardRefs(arg1) {
   return window['go']['main']['App']['ComputeQSOAwardRefs'](arg1);
 }

frontend/wailsjs/go/models.ts

@@ -3229,6 +3229,79 @@ export namespace main {
 	        this.team_last60 = source["team_last60"];
 	    }
 	}
+	export class RDAConflict {
+	    qso_id: number;
+	    callsign: string;
+	    date: string;
+	    band: string;
+	    mode: string;
+	    from_log: string;
+	    from_db: string;
+	    dated: boolean;
+	    confirmed: boolean;
+	
+	    static createFrom(source: any = {}) {
+	        return new RDAConflict(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.qso_id = source["qso_id"];
+	        this.callsign = source["callsign"];
+	        this.date = source["date"];
+	        this.band = source["band"];
+	        this.mode = source["mode"];
+	        this.from_log = source["from_log"];
+	        this.from_db = source["from_db"];
+	        this.dated = source["dated"];
+	        this.confirmed = source["confirmed"];
+	    }
+	}
+	export class RDACompareResult {
+	    scanned: number;
+	    both_known: number;
+	    agree: number;
+	    disagree: number;
+	    only_log: number;
+	    only_db: number;
+	    neither: number;
+	    conflicts: RDAConflict[];
+	
+	    static createFrom(source: any = {}) {
+	        return new RDACompareResult(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.scanned = source["scanned"];
+	        this.both_known = source["both_known"];
+	        this.agree = source["agree"];
+	        this.disagree = source["disagree"];
+	        this.only_log = source["only_log"];
+	        this.only_db = source["only_db"];
+	        this.neither = source["neither"];
+	        this.conflicts = this.convertValues(source["conflicts"], RDAConflict);
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+	
 	export class RelayAutoRule {
 	    device_id: string;
 	    relay: number;