🎨 Palette: Update ARIA labels and add explicit tooltips

[seonghobae]

💡 What: Replaced emojis in aria-label attributes with plain text, and added title attributes as explicit tooltips to icon-only action buttons. Included a specific tooltip explaining the disabled state for the "Add Child" button when max depth is reached.

🎯 Why: Screen readers pronounce emojis awkwardly, leading to an inferior auditory experience for visually impaired users. Additionally, explicit tooltips provide clarity to sighted users, specifically explaining why an action button is disabled rather than leaving them guessing.

📸 Before/After: The visual change is an informative native tooltip on hover.

♿ Accessibility: Enhanced screen reader compatibility and added visual context to interactive elements via title tags.

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PR created automatically by Jules for task 14730924624951862435 started by @seonghobae

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[seonghobae]

이 PR의 변경은 현재 main에 머지된 대표 PR들(#26, #27, #28, #34, #35, #39, #40, #57, #72)에 의해 반영되었거나 더 최신 구현으로 대체되었습니다. 현재 head는 main과 충돌하고 남길 고유 변경이 없어 superseded 상태로 닫습니다.

[google-labs-jules]

이 PR의 변경은 현재 main에 머지된 대표 PR들(#26, #27, #28, #34, #35, #39, #40, #57, #72)에 의해 반영되었거나 더 최신 구현으로 대체되었습니다. 현재 head는 main과 충돌하고 남길 고유 변경이 없어 superseded 상태로 닫습니다.

Understood. Acknowledging that this work is now obsolete and stopping work on this task.