fix(components): [slider] model-value @change Keyboard Events not work

[FrontEndDog]

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Description

test example

🤖[deprecated] Generated by Copilot at 7df68ab

This pull request improves the slider component by simplifying and optimizing the slider button logic, removing unnecessary properties, and fixing the slider value synchronization. It mainly affects the use-slider-button.ts, button.ts, button.vue, and use-slide.ts files.

Related Issue

Fixes #14998 .

Explanation of Changes

🤖[deprecated] Generated by Copilot at 7df68ab

• Remove oldValue property from SliderButtonInitData interface and button.vue component, as it is no longer needed to store the initial value of the slider button (link, link, link)
• Modify emitChange function in useSlide composable to emit change event with initData.firstValue instead of props.modelValue when slider is not in range mode, and sync initData values with props.modelValue after emitting the event, to ensure slider value consistency between parent and child components (link)
• Remove setTimeout wrapper from onDragEnd method in useSliderButton composable, as it is no longer needed to avoid race condition with update:modelValue event, and simplify setPosition method by removing async keyword and await nextTick statement (link, link)
• Change currentPosition computed property in useSliderButton composable to return a number instead of a string with a percentage sign, and append the percentage sign to the bottom or left style property in wrapperStyle computed property, to simplify calculations and avoid parsing (link)
• Use currentPosition property instead of parsing it as a number in onIncrease, onDecrease, and onButtonDown methods in useSliderButton composable, to leverage the previous change and reduce code duplication (link, link)
• Remove unused import of nextTick from vue package in use-slider-button.ts file (link)

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