fix(VNumberInput): resync display after model is overridden

[lazerg]

Description

The spin buttons set the display text from model.value + step and then push that number into the model. When the parent intercepts update:model-value and writes back a different value, model never changes, so the watcher that refreshes the display never runs and the input keeps showing the rejected number. Stepping the other way then looks like it skips a step.

toggleUpDown now compares the model against the text once the update has settled and reformats the text when the two disagree.

Fixes #23098

Markup:

<template>
  <v-app>
    <v-container>
      <v-number-input
        :model-value="value"
        @update:model-value="value = Math.max(0, $event)"
      />
      <div>model: {{ value }}</div>
    </v-container>
  </v-app>
</template>

<script setup>
  import { ref } from 'vue'

  const value = ref(0)
</script>