fix(SW-649): move getDaysInMonth outside component function scope

components/TempDesignSystem/Form/Date/index.tsx

@@ -21,7 +21,7 @@ import type { DateProps } from "./date"
 
 export default function DateSelect({ name, registerOptions = {} }: DateProps) {
   const intl = useIntl()
-  const { control, setValue, trigger, formState, watch } = useFormContext()
+  const { control, setValue, formState, watch } = useFormContext()
   const { field, fieldState } = useController({
     control,
     name,
@@ -43,20 +43,6 @@ export default function DateSelect({ name, registerOptions = {} }: DateProps) {
     .reverse()
     .map((year) => ({ value: year, label: year.toString() }))
 
-  function getDaysInMonth(year: number | null, month: number | null): number {
-    if (month === null) {
-      return 31
-    }
-
-    // If month is February and no year selected, return minimum.
-    if (month === 1 && !year) {
-      return 28
-    }
-
-    const yearToUse = year ?? new Date().getFullYear()
-    return dt(`${yearToUse}-${month + 1}-01`).daysInMonth()
-  }
-
   // Calculate available days based on selected year and month
   const daysInMonth = getDaysInMonth(
     year ? Number(year) : null,
@@ -202,3 +188,17 @@ export default function DateSelect({ name, registerOptions = {} }: DateProps) {
     </DatePicker>
   )
 }
+
+function getDaysInMonth(year: number | null, month: number | null): number {
+  if (month === null) {
+    return 31
+  }
+
+  // If month is February and no year selected, return minimum.
+  if (month === 1 && !year) {
+    return 28
+  }
+
+  const yearToUse = year ?? new Date().getFullYear()
+  return dt(`${yearToUse}-${month + 1}-01`).daysInMonth()
+}