feat(decodes): NEW STATE — badge and filter

The WAS gap made visible: a worked-states set joins the cluster status cache
(distinct states over the three US entities), the status entries carry a
NewState flag wherever the state resolves (log county first, ULS licence
second), and the decode panel gains the badge in its status column plus the
filter chip alongside NEW/BAND/MODE/GRID. Colour from the shared marker
palette, so the cluster can adopt it later without a second hue.

internal/qso/qso.go

@@ -2752,6 +2752,29 @@ func (r *Repo) WorkedCountyKeys(ctx context.Context, keyFn func(state, cnty stri
 	return out, rows.Err()
 }
 
+// WorkedStateKeys returns the set of US states already worked, uppercased —
+// the WAS ledger the cluster and decode panels judge NEW STATE against.
+func (r *Repo) WorkedStateKeys(ctx context.Context) (map[string]struct{}, error) {
+	rows, err := r.db.QueryContext(ctx,
+		`SELECT DISTINCT UPPER(COALESCE(state,'')) FROM qso
+		 WHERE dxcc IN (291,110,6) AND state IS NOT NULL AND state != ''`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	out := make(map[string]struct{}, 64)
+	for rows.Next() {
+		var st string
+		if err := rows.Scan(&st); err != nil {
+			return nil, err
+		}
+		if st != "" {
+			out[st] = struct{}{}
+		}
+	}
+	return out, rows.Err()
+}
+
 // CountQSLViaRouting counts the QSOs whose qsl_via holds a routing method
 // instead of a manager, per isRouting.
 //