🎨 Palette: Add ARIA labels to icon-only buttons

[thirdeyenation]

💡 What: Added aria-label attributes to icon-only action buttons in the tasks list, project list, and message queue components.
🎯 Why: To improve accessibility for screen reader users by providing descriptive text for interactive elements that only have visual icons.
📸 Before/After: Visuals remain unchanged; DOM elements now include aria-labels corresponding to their title attributes.
♿ Accessibility: Makes icon-only buttons navigable and understandable by assistive technologies.

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PR created automatically by Jules for task 8381182618266882495 started by @thirdeyenation

[google-labs-jules]

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