MaCa Editor v1.2.0

AI 編集機能を追加。

What's Changed

• Feature/ai selection actions by @mikoto2000 in #2
• feat: add edit operations and AI submenu to editor context menu by @mikoto2000 in #3
• Feature/ai document chat by @mikoto2000 in #4
• Feature/ai diagram generation by @mikoto2000 in #5

Full Changelog: v1.1.0...v1.2.0