feat: add aria-label and title support to Button component (#225)

[Hollujay]

Summary

Adds aria-label and title prop support to the reusable Button component, enabling accessible icon-only buttons. All existing icon-only buttons in the codebase already had explicit aria-label attributes, but the Button component itself did not forward these props to the underlying <button> element.

Changes

src/components/Button.jsx

• Added ariaLabel and title props that are passed through to the <button> element
• Updated JSDoc with the new prop documentation

src/components/Button.stories.jsx

• Added IconOnly story demonstrating usage with an icon (✕) and ariaLabel/title
• Added ariaLabel and title to Storybook argTypes

test/unit/Button.test.jsx (new)

• Renders children as text content
• Calls onClick when clicked
• Does not call onClick when disabled
• Applies a custom aria-label for icon-only buttons
• Applies a custom title attribute
• Sets the type attribute

Closes #225

[arisu6804]

Looks great, thanks for the careful work! 🙌

[arisu6804]

Solid, merging! ✨