feat: add SectionAccordion component to shared/ui

src/shared/ui/SectionAccordion/index.ts

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+export { SectionAccordion } from './ui/SectionAccordion'

src/shared/ui/SectionAccordion/ui/SectionAccordion.test.tsx

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+import { describe, it, expect, vi } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { SectionAccordion } from './SectionAccordion'
+
+const defaultProps = {
+  number: '01',
+  title: 'About',
+  id: 'about',
+  isActive: false,
+  onClick: vi.fn(),
+  children: <p>Content here</p>,
+}
+
+describe('SectionAccordion', () => {
+  describe('collapsed state (isActive=false)', () => {
+    it('renders a section element with the given id', () => {
+      const { container } = render(<SectionAccordion {...defaultProps} />)
+      expect(container.querySelector('section#about')).toBeInTheDocument()
+    })
+    it('renders a button with number and title', () => {
+      render(<SectionAccordion {...defaultProps} />)
+      expect(screen.getByRole('button', { name: /01.*About/i })).toBeInTheDocument()
+    })
+    it('does not render children', () => {
+      render(<SectionAccordion {...defaultProps} />)
+      expect(screen.queryByText('Content here')).not.toBeInTheDocument()
+    })
+    it('calls onClick when button is clicked', async () => {
+      const onClick = vi.fn()
+      render(<SectionAccordion {...defaultProps} onClick={onClick} />)
+      await userEvent.click(screen.getByRole('button'))
+      expect(onClick).toHaveBeenCalledOnce()
+    })
+  })
+
+  describe('active state (isActive=true)', () => {
+    const activeProps = { ...defaultProps, isActive: true }
+
+    it('renders an h1 with number and title', () => {
+      render(<SectionAccordion {...activeProps} />)
+      expect(screen.getByRole('heading', { level: 1, name: /01.*About/i })).toBeInTheDocument()
+    })
+    it('renders children', () => {
+      render(<SectionAccordion {...activeProps} />)
+      expect(screen.getByText('Content here')).toBeInTheDocument()
+    })
+    it('does not render a button', () => {
+      render(<SectionAccordion {...activeProps} />)
+      expect(screen.queryByRole('button')).not.toBeInTheDocument()
+    })
+    it('content wrapper has animate-fadeIn class', () => {
+      const { container } = render(<SectionAccordion {...activeProps} />)
+      expect(container.querySelector('.animate-fadeIn')).toBeInTheDocument()
+    })
+  })
+})

src/shared/ui/SectionAccordion/ui/SectionAccordion.tsx

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+import type { ReactNode } from 'react'
+
+interface SectionAccordionProps {
+  /**
+   * Display number prefix (e.g. "01")
+   */
+  number: string
+  /**
+   * Section title
+   */
+  title: string
+  /**
+   * HTML id for anchor navigation
+   */
+  id: string
+  /**
+   * Whether this section is expanded
+   */
+  isActive: boolean
+  /**
+   * Called when the collapsed header is clicked
+   */
+  onClick: () => void
+  /**
+   * Section content, shown when active
+   */
+  children: ReactNode
+}
+
+/**
+ * Accordion-style section that collapses to a heading button when inactive.
+ */
+export function SectionAccordion({ number, title, id, isActive, onClick, children }: SectionAccordionProps) {
+  return (
+    <section id={id} className="scroll-mt-8">
+      {isActive ? (
+        <div className="mb-12">
+          <div className="mb-16">
+            <h1
+              className="font-heading font-black text-5xl leading-[1.2] mb-0"
+              style={{ fontVariationSettings: "'WONK' 1, 'SOFT' 0" }}
+            >
+              {number}. {title}
+            </h1>
+          </div>
+          <div className="animate-fadeIn">
+            {children}
+          </div>
+        </div>
+      ) : (
+        <button
+          onClick={onClick}
+          className="w-full text-left mb-3 py-3 transition-all duration-200 hover:opacity-60 group"
+        >
+          <h2
+            className="font-heading font-black text-2xl sm:text-3xl opacity-30 group-hover:opacity-50 transition-opacity"
+            style={{ fontVariationSettings: "'WONK' 1, 'SOFT' 0" }}
+          >
+            {number}. {title}
+          </h2>
+        </button>
+      )}
+    </section>
+  )
+}