feat(awards): offer the ambiguous references at log time

The refusal to guess was only visible in the award editor's test tab and
in the awards table — both of them places an operator goes long after the
contact is over. It has to appear while the station is still in front of
you, so ComputeQSOAwardRefs now reports the candidates it declined to
assign and the F3 panel lists them as buttons: click one and it is
written to award_refs, replacing any sibling picked for that award.

They are never auto-added — adding one would be exactly the guess the
setting exists to refuse.

Also: the dark-theme fix for the native calendar glyph named only
input[type=date], so date-time fields kept an invisible icon. All the
temporal input types now share the rule.

frontend/wailsjs/go/models.ts

@@ -2708,6 +2708,7 @@ export namespace main {
 	    ref: string;
 	    name?: string;
 	    pickable: boolean;
+	    ambiguous?: boolean;
 	
 	    static createFrom(source: any = {}) {
 	        return new QSOAwardRef(source);
@@ -2719,6 +2720,7 @@ export namespace main {
 	        this.ref = source["ref"];
 	        this.name = source["name"];
 	        this.pickable = source["pickable"];
+	        this.ambiguous = source["ambiguous"];
 	    }
 	}
 	export class QSORate {