Remove unnecessary async from 9 functions that have no await

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/DurationInput.vue

@@ -365,7 +365,7 @@ function calculateTotalSeconds() {
 }
 
 /** Initializes the duration display based on min/max boundaries and preset value. */
-async function createData() {
+function createData() {
   const size = props.size;
 
   if (maxTotal.value !== null && minTotal.value !== null) {