fix(tooltip): Tooltip 문서 추가 및 SSR/ref 버그 수정

[3o14]

Summary

Tooltip 컴포넌트의 문서 페이지를 추가합니다.
문서를 작성하는 과정에서 발견한 Tooltip 버그 수정 사항이 담긴 PR입니다.

• createPortal을 조건 없이 호출해서 생기던 SSR 크래시 위험
• tooltipContent가 비어있을 때 전달된 ref가 끊기던 문제

Changes

• Tooltip 문서 페이지 추가: 설치, 사용법, Placement/Controlled visibility/Custom styling/asChild 예제, Anatomy, API Reference, Accessibility, Known limitations
• SSR 크래시 수정: document가 존재하기 전에는 실행되지 않도록 mounted 플래그로 createPortal 호출을 지연
• ref 끊김 수정: tooltipContent가 falsy여도 트리거의 ref/이벤트 핸들러 연결은 그대로 유지하고, 툴팁 마크업만 생략하도록 변경
• tooltipContent가 비어있을 때 ref가 정상 forwarding되는지 확인하는 회귀 테스트 추가

Visuals

[changeset-bot]

🦋 Changeset detected

Latest commit: 6db929e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@sipe-team/tooltip	Patch
@sipe-team/side	Patch
docs	Patch

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
packages/tooltip/src/Tooltip.test.tsx	100.00% <100.00%> (ø)
packages/tooltip/src/Tooltip.tsx	94.05% <100.00%> (+0.24%)	⬆️

... and 2 files with indirect coverage changes

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