feat(button): [button] Modify icon button up and down centering issue

[Youyou-smiles]

PR

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] The commit message follows our Commit Message Guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• [ ] Yes
• [ ] No

Other information

Summary by CodeRabbit

• New Features

  • Improved layout and alignment for "only icon" buttons, enhancing visual consistency.
  • Adjusted padding for icon-only buttons to eliminate extra space around icons.

• Bug Fixes

  • Ensured responsive icon sizes based on button height for better usability.

[coderabbitai[bot]]

Walkthrough

The changes in this pull request focus on the index.less file for the button component, specifically enhancing the layout and alignment of "only icon" buttons. Key modifications include the introduction of inline-flex display properties, centering adjustments for icon alignment, and the removal of padding for the .is-only-icon class. Additionally, the handling of button sizes is updated to ensure responsive icon sizes, contributing to a more visually consistent presentation of icon-only buttons.

Changes

File Path	Change Summary
packages/theme/src/button/index.less	- Added display: inline-flex, align-items: center, and justify-content: center to .is-only-icon class. - Set padding to 0 for .is-only-icon class. - Updated icon sizing management with .size-only-icon-mixin and .size-only-icon-ontext-iconsize-mixin.

Possibly related PRs

• #2104: Modifies index.less to add a new CSS variable for the .is-ghost class, affecting button styling.
• #2148: Removes certain properties from the .is-only-icon class, directly relating to icon-only button layout.
• #2380: Introduces a new variable for icon sizing in the .is-only-icon state, enhancing functionality for icon-only buttons.
• #2347: Modifies the .is-icon class to set its display to inline-flex and align items to the center, relevant to icon button layout improvements.

Suggested labels

enhancement

Suggested reviewers

• zzcr

🐰 In the meadow, buttons shine,
Icons centered, oh so fine.
Padding gone, they stand so tall,
A joyful change, we love them all!
Hopping forth with style and grace,
Icon buttons find their place! 🌼

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