🎨 Palette: Add ARIA label to delete conversation button

[Dexploarer]

💡 What: Added an aria-label="Delete conversation" attribute to the icon-only "×" delete button in ConversationsSidebar.tsx.
🎯 Why: To ensure screen readers announce the button's destructive action clearly, rather than just reading the raw "times" symbol. This matches the established accessibility standards for icon-only buttons.
📸 Before/After: Visually identical; purely an accessibility improvement.
♿ Accessibility: Improves keyboard and screen reader accessibility by providing a clear, descriptive label for a destructive action.

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PR created automatically by Jules for task 11350580816354249542 started by @Dexploarer

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[codereviewbot-ai]

There is no guard to prevent 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 clicks delete on multiple conversations rapidly.

Recommendation:
Add a check to prevent setting a new confirmation dialog if deletingId is not null:

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

[gemini-code-assist]

Code Review

This pull request improves accessibility in the ConversationsSidebar component by adding an aria-label to the delete conversation button. The feedback suggests further enhancing this by including the specific conversation title within the label to provide better context for screen reader users.

[gemini-code-assist]

When providing an aria-label for buttons within a list, it is a best practice to include the specific item's context (e.g., the conversation title). This helps screen reader users distinguish between multiple 'Delete' buttons when navigating by controls.

Suggested change

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