🎨 Palette: [UX improvement] Add accessible name to Main Toolbar

[awest813]

💡 What: Added an accessible name (getAccessibleContext().setAccessibleName("Main Toolbar")) to the JToolBar created in AbstractWorldEditorPanel.java.
🎯 Why: To improve accessibility by giving screen readers a clear and descriptive name for the application's main toolbar, enhancing navigability for users relying on assistive technologies.
♿ Accessibility: This directly addresses a missing ARIA-equivalent label on a core UI component, following standard Java Swing a11y practices.

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PR created automatically by Jules for task 9089682976445354825 started by @awest813

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