fix: Lightbox 커서 개선 및 Mermaid 이미지 클릭 활성화

[Twodragon0]

Summary

• Mermaid SVG 이미지도 클릭하여 lightbox로 확대 가능하도록 변경
• 기본 lightbox 커서를 grab에서 zoom-in으로 변경 (손바닥 모양 제거)
• 확대(zoom) 시에만 grab/grabbing 커서 표시

Test plan

• Mermaid 이미지 클릭 시 lightbox 열림 확인
• lightbox에서 기본 커서가 zoom-in인지 확인
• 확대 후에만 grab 커서 표시되는지 확인

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[Copilot]

Pull request overview

This PR improves the lightbox UX by changing cursor behavior and enabling mermaid diagram images to open in the lightbox. Previously, mermaid SVG images were explicitly excluded from lightbox attachment, and the lightbox used a grab cursor in its default (non-zoomed) state.

Changes:

• Removed the early-return guard that skipped mermaid SVG images (/mermaid/ path check), allowing them to be clicked to open in the lightbox
• Changed the default lightbox image cursor from grab to zoom-in and the zoomed cursor from move to grab, creating a more intuitive cursor progression

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
assets/js/post-page.js	Removed the mermaid image skip filter in attachImageHandlers()
_sass/_lightbox.scss	Updated cursor values: default grab → zoom-in, zoomed move → grab

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