Add initial Code

resources/js/components/ui/number-field/NumberFieldIncrement.vue

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+<script setup lang="ts">
+import type { NumberFieldIncrementProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { reactiveOmit } from "@vueuse/core"
+import { Plus } from "lucide-vue-next"
+import { NumberFieldIncrement, useForwardProps } from "reka-ui"
+import { cn } from "@/lib/utils"
+
+const props = defineProps<NumberFieldIncrementProps & { class?: HTMLAttributes["class"] }>()
+
+const delegatedProps = reactiveOmit(props, "class")
+
+const forwarded = useForwardProps(delegatedProps)
+</script>
+
+<template>
+  <NumberFieldIncrement data-slot="increment" v-bind="forwarded" :class="cn('absolute top-1/2 -translate-y-1/2 right-0 disabled:cursor-not-allowed disabled:opacity-20 p-3', props.class)">
+    <slot>
+      <Plus class="h-4 w-4" />
+    </slot>
+  </NumberFieldIncrement>
+</template>