fix(codegen): reduce poll timer churn

Use a ticker in watch mode and build registration strings without fmt.

Co-Authored-By: Virgil <virgil@lethean.io>

cmd/codegen/main.go

@@ -82,6 +82,9 @@ func runDaemon(ctx context.Context, inputPath, outputPath string, emitTypes bool
 
 	var lastInput string
 	var lastOutput string
+	ticker := time.NewTicker(pollInterval)
+	defer ticker.Stop()
+
 	for {
 		input, err := coreio.Local.Read(inputPath)
 		if err != nil {
@@ -111,7 +114,7 @@ func runDaemon(ctx context.Context, inputPath, outputPath string, emitTypes bool
 				return nil
 			}
 			return ctx.Err()
-		case <-time.After(pollInterval):
+		case <-ticker.C:
 		}
 	}
 }

codegen/codegen.go

@@ -1,7 +1,6 @@
 package codegen
 
 import (
-	"fmt"
 	"slices"
 	"strconv"
 	"strings"
@@ -81,7 +80,13 @@ func GenerateClass(tag, slot string) (string, error) {
 //
 // Example: GenerateRegistration("nav-bar", "NavBar")
 func GenerateRegistration(tag, className string) string {
-	return fmt.Sprintf(`customElements.define("%s", %s);`, tag, className)
+	var b strings.Builder
+	b.WriteString(`customElements.define("`)
+	b.WriteString(tag)
+	b.WriteString(`", `)
+	b.WriteString(className)
+	b.WriteString(`);`)
+	return b.String()
 }
 
 // codegen/codegen.go: TagToClassName converts a kebab-case tag to PascalCase class name.