Add Race workout kind with Garmin eventType auto-detection, sync-time running filter, and pill-based review queue filter

Race is the 8th fixed workout kind, seeded with a real (not placeholder)
rule since Garmin Connect's eventType.typeKey reports "race" for
manually-tagged race activities. Non-running activity types (padel,
cycling, strength training, ...) are now dropped at sync time instead of
being stored. The Review Queue's type filter is now clickable exclusive
pill buttons instead of a dropdown.

backend/internal/store/workoutkinds_taxonomy_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 )
 
-func TestWorkoutTaxonomy_SeededWithSevenFixedTypes(t *testing.T) {
+func TestWorkoutTaxonomy_SeededWithEightFixedTypes(t *testing.T) {
 	db := openTestDB(t)
 	ctx := context.Background()
 
@@ -13,13 +13,13 @@ func TestWorkoutTaxonomy_SeededWithSevenFixedTypes(t *testing.T) {
 	if err != nil {
 		t.Fatalf("ListWorkoutKinds: %v", err)
 	}
-	if len(kinds) != 7 {
-		t.Fatalf("expected 7 seeded workout kinds, got %d: %+v", len(kinds), kinds)
+	if len(kinds) != 8 {
+		t.Fatalf("expected 8 seeded workout kinds, got %d: %+v", len(kinds), kinds)
 	}
 
 	wantNames := map[string]bool{
 		"Easy Run": false, "Long Run": false, "Threshold 30'": false, "Threshold 60'": false,
-		"Tempo": false, "Interval": false, "MAS Test": false,
+		"Tempo": false, "Interval": false, "MAS Test": false, "Race": false,
 	}
 	for _, k := range kinds {
 		if _, ok := wantNames[k.Name]; !ok {