fix(components): [color-picker] first click should be trigger

[wonderl17]

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Description

🤖 Generated by Copilot at 5b1462e

Refactor and optimize color picker component. Use v-show instead of v-if for empty icon in color-picker.vue to avoid unnecessary rendering.

Related Issue

Fixes #14205.

Explanation of Changes

🤖 Generated by Copilot at 5b1462e

• Improve performance and user experience of color picker component by using v-show instead of v-if for empty icon (link)

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[github-actions]

[wonderl17]

第一次点击由于先走 v-click-outside 的逻辑，会导致 icon 在那一瞬间被 v-if="false"消除后再出现，那一刻恰好无法触发click

[github-actions]

🧪 Playground Preview: https://element-plus.run/?pr=14209
Please comment the example via this playground if needed.