fix: use %02d format for collection rename index

internal/filter/collection_rename.go

@@ -129,7 +129,7 @@ func RenameCollectionNodes(proxies []model.ProxyNode, opts *model.RenameOptions)
 
 		name := info.baseName
 		if o.Index && total > 1 {
-			name = fmt.Sprintf("%s-%d", name, counters[info.baseName])
+			name = fmt.Sprintf("%s %02d", name, counters[info.baseName])
 		}
 
 		next := cloneProxy(info.proxy)

internal/filter/collection_rename_test.go

@@ -45,10 +45,10 @@ func TestRenameCollectionNodes_MultipleNodes(t *testing.T) {
 	if len(result) != 3 {
 		t.Fatalf("expected 3 nodes, got %d", len(result))
 	}
-	// All 3 should be numbered -1, -2, -3
+	// All 3 should be numbered 01, 02, 03
 	for i, node := range result {
 		name := node["name"].(string)
-		expected := fmt.Sprintf("-%d", i+1)
+		expected := fmt.Sprintf("%02d", i+1)
 		if !strings.Contains(name, expected) {
 			t.Errorf("node[%d]: expected number %s in name %q", i, expected, name)
 		}
@@ -222,7 +222,7 @@ func TestRenameCollectionNodes_DisableIndex(t *testing.T) {
 	for i, node := range result {
 		name := node["name"].(string)
 		// Should not contain number suffix
-		suffix := fmt.Sprintf("-%d", i+1)
+		suffix := fmt.Sprintf("%02d", i+1)
 		if strings.HasSuffix(name, suffix) {
 			t.Errorf("node[%d]: index should be disabled, got %q", i, name)
 		}
@@ -247,7 +247,7 @@ func TestRenameCollectionNodes_OnlyFlagAndIndex(t *testing.T) {
 		if strings.Contains(name, "[A]") {
 			t.Errorf("node[%d]: alias should not appear, got %q", i, name)
 		}
-		expected := fmt.Sprintf("🇭🇰-%d", i+1)
+		expected := fmt.Sprintf("🇭🇰 %02d", i+1)
 		if name != expected {
 			t.Errorf("node[%d]: expected %q, got %q", i, expected, name)
 		}