feat: Add test coverage for Accordion component

[Copilot]

Adds comprehensive test suite for the Accordion component family (Accordion, AccordionItem, AccordionTrigger, AccordionContent).

Changes

• Test Coverage: 10 tests covering single/multiple modes, default values, disabled states, custom indicators, and accessibility attributes

Component API

// Single mode - only one item open at a time
<Accordion type="single" defaultValue="item-2">
  <AccordionItem value="item-1">
    <AccordionTrigger>First Item</AccordionTrigger>
    <AccordionContent>Content here</AccordionContent>
  </AccordionItem>
  <AccordionItem value="item-2">
    <AccordionTrigger>Second Item</AccordionTrigger>
    <AccordionContent>Content here</AccordionContent>
  </AccordionItem>
</Accordion>

// Multiple mode - multiple items can be open
<Accordion type="multiple" defaultValue={['item-1', 'item-2']}>
  {/* ... */}
</Accordion>

The component implementation includes smooth height animations, full ARIA support, and customizable indicators.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>feat: Accordion</issue_title>
<issue_description>### common ui

• Accordion

feature

• Accordion
• AccordionItem
• AccordionTrigger
• AccordionContent</issue_description>

<agent_instructions>Whether the added code affects existing code, is likely to cause errors, and is general enough to use.
</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes feat: Accordion #34

---

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	82.87%	3382 / 4081
🔵	Statements	82.87%	3382 / 4081
🔵	Functions	69%	69 / 100
🔵	Branches	77.35%	222 / 287

File Coverage

No changed files found.

Generated in workflow #122 for commit 95956f8 by the Vitest Coverage Report Action

[kyechan99]

LGTM

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.87%. Comparing base (445dbc2) to head (95956f8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
+ Coverage   80.34%   82.87%   +2.52%     
==========================================
  Files          84       84              
  Lines        4081     4081              
  Branches      239      256      +17     
==========================================
+ Hits         3279     3382     +103     
+ Misses        802      699     -103     

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