feat: expose End Validity in plan creation modal and handle optional input

src/app/plans/page.tsx

@@ -36,6 +36,7 @@ export default function PlansPage() {
   const [name, setName] = useState('');
   const [code, setCode] = useState('');
   const [validityStart, setValidityStart] = useState('');
+  const [validityEnd, setValidityEnd] = useState('');
   const [type, setType] = useState('PERCENTAGE');
   const [metaAmount, setMetaAmount] = useState('');
   const [percentageRate, setPercentageRate] = useState('');
@@ -86,6 +87,7 @@ export default function PlansPage() {
           name,
           code,
           validityStart,
+          validityEnd: validityEnd || undefined,
           type,
           metaAmount: metaAmount ? parseFloat(metaAmount) : undefined,
           percentageRate: percentageRate ? parseFloat(percentageRate) : undefined,
@@ -105,6 +107,7 @@ export default function PlansPage() {
       setName('');
       setCode('');
       setValidityStart('');
+      setValidityEnd('');
       setType('PERCENTAGE');
       setMetaAmount('');
       setPercentageRate('');
@@ -263,6 +266,17 @@ export default function PlansPage() {
                 />
               </div>
 
+              <div className={styles.formGroup}>
+                <label className={styles.label} htmlFor="plan-validity-end">{t('plans.modalValidityEnd')}</label>
+                <input
+                  id="plan-validity-end"
+                  type="date"
+                  className={styles.input}
+                  value={validityEnd}
+                  onChange={(e) => setValidityEnd(e.target.value)}
+                />
+              </div>
+
               <div className={styles.formGroup}>
                 <label className={styles.label} htmlFor="plan-type">{t('plans.modalType')}</label>
                 <select

src/lib/i18n/dictionaries/en.json

@@ -148,7 +148,8 @@
       "FIXED": "Fixed Commission"
     },
     "errorFind": "Could not find the plan.",
-    "errorLoad": "Error loading plan information."
+    "errorLoad": "Error loading plan information.",
+    "modalValidityEnd": "End Validity (Optional)"
   },
   "rules": {
     "back": "Back to Plans",

src/lib/i18n/dictionaries/es.json

@@ -148,7 +148,8 @@
       "FIXED": "Comisión Fija"
     },
     "errorFind": "No se pudo encontrar el plan.",
-    "errorLoad": "Error al cargar la información del plan."
+    "errorLoad": "Error al cargar la información del plan.",
+    "modalValidityEnd": "Fin de Vigencia (Opcional)"
   },
   "rules": {
     "back": "Volver a Planes",