🎨 Palette: [UX improvement] Add ARIA labels to icon-only buttons in file browser

[LebToki]

💡 What: Added aria-label attributes to the icon-only buttons in the file browser (New File, New Directory, Close, Rename, Delete).
🎯 Why: To improve accessibility for screen reader users who previously had no context for what these icon-only buttons did.
📸 Before/After: No visual changes.
♿ Accessibility: Added descriptive ARIA labels to 5 icon-only buttons in the file explorer UI.

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PR created automatically by Jules for task 16143712647538391044 started by @LebToki

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