🎨 Palette: Add ARIA labels to icon-only buttons

[threehymns]

💡 What

Added missing aria-label attributes alongside title attributes to various icon-only buttons throughout the application.

🎯 Why

When building UI with icon-only buttons (e.g., using HugeiconsIcon), the presence of a title attribute provides a helpful tooltip on hover, but it is often insufficient for comprehensive accessibility. Screen readers require explicit aria-label attributes to reliably announce the purpose of these interactive elements. This change makes the application significantly more accessible.

♿ Accessibility

• Fixed missing labels on Settings page 'Go back' button.
• Fixed missing labels on Code Block language selector, line wrap toggle, and copy buttons.
• Fixed missing labels on Frontmatter property deletion and type selection buttons.
• Fixed missing labels on Graph Tab panel reset and close buttons.
• Added a new journal entry documenting the importance of aria-labels for icon-only buttons.

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PR created automatically by Jules for task 12345375743039040404 started by @threehymns

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