fix(VSelect): match autofill against item values

[pupuking723]

Description

Fixes #20560.

Browser address autofill commonly writes short state or country codes such as CA or US. VSelect and VAutocomplete previously compared autofilled text only with each item's title, so those values were ignored when the visible labels were California or United States.

This keeps the existing title matching behavior and also checks the item value in the autofill-only paths. Focused browser tests cover both components.

Verification:

• pnpm --filter vuetify test:browser --run src/components/VSelect/__tests__/VSelect.spec.browser.tsx src/components/VAutocomplete/__tests__/VAutocomplete.spec.browser.tsx (90 passed)
• pnpm --filter vuetify lint
• git diff --check

Markup:

<script setup>
const states = [
  { title: 'California', value: 'CA' },
  { title: 'New York', value: 'NY' },
]

const countries = [
  { title: 'United States', value: 'US' },
  { title: 'Canada', value: 'CA' },
]
</script>

<template>
  <v-container>
    <v-form autocomplete="on">
      <v-text-field
        autocomplete="name"
        label="Name"
        name="name"
      />

      <v-select
        autocomplete="address-level1"
        :items="states"
        label="State"
        name="state"
      />

      <v-autocomplete
        autocomplete="country"
        :items="countries"
        label="Country"
        name="country"
      />
    </v-form>
  </v-container>
</template>