chore(labels): park the label designer and printing on feature/labels

The feature needs more rounds than the next release can wait for, so main goes
back to before it: the packages, bindings, migration, UI and i18n all move to
the feature/labels branch, which holds every commit. The 0.26.23 block keeps
only the Station column.

The 0031 migration may already have run on a machine that launched a dev build;
the two label tables it created are inert and the recorded migration row is
harmless — the runner only applies filenames it has, so re-adding the migration
when the branch merges will skip cleanly there and apply everywhere else.

internal/qso/qso.go

@@ -232,11 +232,8 @@ type ListFilter struct {
 	Band            string `json:"band,omitempty"`
 	Mode            string `json:"mode,omitempty"`
 	StationCallsign string `json:"station_callsign,omitempty"`
-	// QSLSentIn keeps only rows whose paper-QSL sent status is one of these
-	// values — 'R' (requested) and 'Q' (queued) are the label printer's queue.
-	QSLSentIn []string `json:"qsl_sent_in,omitempty"`
-	Limit     int      `json:"limit,omitempty"`
-	Offset    int      `json:"offset,omitempty"`
+	Limit           int    `json:"limit,omitempty"`
+	Offset          int    `json:"offset,omitempty"`
 }
 
 // Repo accesses the qso table.
@@ -1214,12 +1211,6 @@ func (r *Repo) List(ctx context.Context, f ListFilter) ([]QSO, error) {
 		q += " AND station_callsign = ?"
 		args = append(args, f.StationCallsign)
 	}
-	if len(f.QSLSentIn) > 0 {
-		q += " AND qsl_sent IN (?" + strings.Repeat(",?", len(f.QSLSentIn)-1) + ")"
-		for _, v := range f.QSLSentIn {
-			args = append(args, v)
-		}
-	}
 	q += " ORDER BY qso_date DESC, id DESC"
 	if f.Limit <= 0 {
 		f.Limit = 500