🎨 Palette: Add aria-label to delete conversation button

[Dexploarer]

💡 What

Added an aria-label attribute to the icon-only "×" button used for deleting conversations in the ConversationsSidebar component.

🎯 Why

Icon-only buttons rely on explicit labels for accessibility. While a title attribute existed, relying solely on title is insufficient for robust screen reader support. Adding an aria-label ensures the purpose of the button ("Delete conversation") is clearly announced to users relying on assistive technologies.

📸 Before/After

Not a visual change.

♿ Accessibility

Improved screen reader accessibility by providing an explicit programmatic label for a destructive action button.

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PR created automatically by Jules for task 7777317479155683889 started by @Dexploarer

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[codereviewbot-ai]

There is no guard against opening a new delete confirmation dialog while a delete operation is already in progress (deletingId). This could lead to inconsistent UI state if the user rapidly clicks delete on multiple conversations.

Recommended solution:
Add a check to prevent setting a new confirmation while a delete is ongoing:

if (!deletingId) setConfirmDeleteId(conv.id);

[gemini-code-assist]

Code Review

This pull request improves accessibility by adding an aria-label to the delete button in the ConversationsSidebar and documenting this practice in the project's learning palette. The review feedback suggests enhancing the label by including the conversation title to provide better context for screen reader users, ensuring they can distinguish which specific conversation is being deleted.

[gemini-code-assist]

Since this button is repeated for every conversation in the list, using a static aria-label makes it difficult for screen reader users to distinguish which conversation each button refers to. Including the conversation title in the label provides necessary context for the destructive action.

Suggested change

	aria-label="Delete conversation"
	aria-label={`Delete conversation: ${conv.title}`}