fix(VColorPicker): consistent output values

[KaelWD]

Description

Fixes #16672

• hex now parses with or without leading #
• alpha value is removed instead of resetting to FF

Markup:

<template>
  <v-app>
    <v-main>
      <v-container>
        <v-color-picker
          v-model="pickedColor"
          elevation="15"
          mode="rgba"
          :modes="['hex', 'hexa', 'rgb', 'rgba']"
        />
        <div class="mt-3">
          Selected color: {{ pickedColor }}
        </div>
      </v-container>
    </v-main>
  </v-app>
</template>

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

  const pickedColor = ref('#00FF00')
</script>

[nekosaur]

Hah, I was fixing #16689 and noticed these issues. I hadn't seen your PR. Here's mine master...fix/color-picker-stuff. Your changes look good, and I feel like you probably have a better grasp of the color utils. You might want to bring over my tests though.

[KaelWD]

Pretty similar solutions.

• I think your getValue changes are redundant, I just skip calling it if there's no color.
• I removed alpha rounding because it was skipping some values
• My hex changes handle short values (#rgb, #rgba) with or without #, and remove alpha if it's FF. It does also remove a from objects though which I'm not super stoked about

[johnleider]

Much better experience, gj.