feat(go, ts): add system-region mapping and highlight functionality

app.go

@@ -138,3 +138,25 @@ func (a *App) GetCharacterLocations() ([]CharacterLocation, error) {
 	defer cancel()
 	return a.ssi.GetCharacterLocations(ctx)
 }
+
+// SystemRegion holds system + region names from local DB
+type SystemRegion struct {
+	System string `json:"system"`
+	Region string `json:"region"`
+}
+
+// ListSystemsWithRegions returns all solar system names and their regions from the local SQLite DB
+func (a *App) ListSystemsWithRegions() ([]SystemRegion, error) {
+	if a.ssi == nil || a.ssi.db == nil {
+		return nil, errors.New("db not initialised")
+	}
+	var rows []SystemRegion
+	// mapSolarSystems has regionID; mapRegions has regionName
+	q := `SELECT s.solarSystemName AS system, r.regionName AS region
+		FROM mapSolarSystems s
+		JOIN mapRegions r ON r.regionID = s.regionID`
+	if err := a.ssi.db.Raw(q).Scan(&rows).Error; err != nil {
+		return nil, err
+	}
+	return rows, nil
+}