fix: enforce non-negative currency inputs

Author: reiroop

src/components/applicationDetail/ApplicationTarget.vue

@@ -73,7 +73,7 @@ const handleRemoveTarget = async () => {
         v-model="targetModel.target"
         :options="targetOptions"
         label="対象者" />
-      <BaseNumberInput v-model="targetModel.amount" label="金額">
+      <BaseNumberInput v-model="targetModel.amount" label="金額" :min="0">
         <span class="mt-auto mb-2 ml-3 text-2xl font-bold text-text-secondary">
           ¥
         </span>

src/components/newApplication/NewApplicationTargets.vue

@@ -27,7 +27,7 @@ function handleRemoveTarget(index: number) {
           :options="userOptions"
           class="grow"
           label="払い戻し対象者" />
-        <BaseNumberInput v-model="target.amount" label="金額">
+        <BaseNumberInput v-model="target.amount" label="金額" :min="0">
           <span
             class="mt-auto mb-2 ml-3 text-2xl font-bold text-text-secondary">
             ¥

src/pages/NewPartitionPage.vue

@@ -39,6 +39,7 @@ watch(isUnspecifiedBudget, newVal => {
         v-model="partition.budget"
         label="予算"
         required
+        :min="0"
         :readonly="isUnspecifiedBudget">
         <span class="mt-auto mb-2 ml-3 text-2xl font-bold text-text-secondary">
           ¥