fix(icon): [icon] restore title demo

Walkthrough

The pull request introduces various modifications across several Vue component files and documentation. Key changes include updating icon component styles with specific class names, simplifying button descriptions in documentation, and adding new Vue components and test cases. The adjustments aim to enhance the clarity of documentation and improve the visual presentation of icon components while also introducing new functionality related to displaying titles.

Changes

File Path	Change Summary
`examples/sites/demos/pc/app/button/webdoc/button.js`	Updated the `desc` property for the `icon` button demo, simplifying descriptions in both Chinese and English.
`examples/sites/demos/pc/app/icon/basic-usage-composition-api.vue`	Modified `<template>` and `<style>` sections to include specific class attributes for icons and adjusted styles, including font sizes and margin changes.
`examples/sites/demos/pc/app/icon/basic-usage.spec.js`	Updated a test case to change the assertion for the first icon's `font-size` from `24px` to `14px` and removed the loop checking dimensions of multiple icons.
`examples/sites/demos/pc/app/icon/basic-usage.vue`	Enhanced the `<template>` and `<style>` sections by adding specific class attributes for icons and adjusting styles, including font sizes and margin reductions.
`examples/sites/demos/pc/app/icon/show-title-composition-api.vue`	Introduced a new Vue component that renders a `div` with a title and includes a custom `<tiny-icon-copy>` component.
`examples/sites/demos/pc/app/icon/show-title.spec.ts`	Added a new test case to verify the presence of an element with the title '复制' on the page.
`examples/sites/demos/pc/app/icon/show-title.vue`	Introduced a new Vue component that includes an `IconCopy` component within a `div` with a title attribute.
`examples/sites/demos/pc/app/icon/webdoc/icon.js`	Expanded the demo description for `demoId: 'basic-usage'` and added a new demo object with `demoId: 'show-title'`, providing detailed instructions and examples for using the icon functions.

Possibly related PRs

#2105: Addresses style exceptions and icon parsing, relevant to the visual presentation of buttons and icons.
#2344: Modifies the size of steps icons, involving visual elements similar to the button icons discussed.
#2347: Focuses on button graphics and layout, directly relating to changes made regarding button descriptions and functionality.
#2348: Introduces modifications to button properties and descriptions, aligning with the simplification of button documentation.
#2349: Involves changes to the container component, potentially relating to the overall layout of buttons.
#2351: Modifies href attributes of link components, relevant to button functionality discussed.
#2359: Addresses issues in the button group component, closely related to button functionality and descriptions.

Suggested labels

enhancement

Suggested reviewers

zzcr

🐰 In the garden of code, we hop and play,
With icons and buttons, brightening the day.
Descriptions simplified, styles anew,
Our components now shine, just for you!
So let’s celebrate this joyful spree,
For every little change brings harmony! 🌼

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opentiny / tiny-vue