🎨 Palette: Tooltips and visual disabled states for icon buttons

[seonghobae]

This pull request introduces a micro-UX enhancement by adding title attributes to all icon-only buttons (toggle, add-child, edit, delete) in the app.js render loop. It provides better accessibility for sighted users, and specifically explains the disabled state on the add-child button ("Can only add up to 3 levels"). It also removes emojis from the aria-labels for cleaner screen reader announcements. Finally, it adds a :disabled visual state in styles.css so disabled buttons correctly look non-interactive. E2E tests have also been updated to query buttons matching the new label names.

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PR created automatically by Jules for task 9095084213214302608 started by @seonghobae

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