fix(VDateInput): min/max with built-in adapter

[J-Sek]

• added missing adapter.date(...) around props.min and props.max
• extracted into reusable composable
• changed to avoid clamping multiple (non-range) - it is confusing to when input field says 2 selected, but the picker shows only one day

fixes #22291

Markup:

<template>
  <v-app theme="dark">
    <v-container>
      <v-alert>
        paste: <v-code>09/09/2025</v-code> or <v-code>01/02/2026</v-code>
      </v-alert>
      <v-date-input label="Date input" max="2025-11-11" />
    </v-container>
    <v-container>
      <v-alert>
        paste: <v-code>09/09/2025</v-code> or <v-code>11/01/2025, 11/08/2025, 11/15/2025</v-code>
      </v-alert>
      <v-date-input label="Date input" max="2025-11-11" multiple />
    </v-container>
    <v-container>
      <v-alert>
        paste: <v-code>09/09/2025</v-code> or <v-code>11/07/2025 - 11/14/2025</v-code>
      </v-alert>
      <v-date-input label="Date input" max="2025-11-11" multiple="range" />
    </v-container>
  </v-app>
</template>