fix: prevent auto-focus on pin buttons in ApiConfigSelector

- Add tabIndex={-1} to pin buttons to prevent them from receiving focus automatically
- This fixes the issue where focus would jump to the first pin button when opening the dropdown with 6 or fewer items

Author: hannesrudolph

webview-ui/src/components/chat/ApiConfigSelector.tsx

@@ -109,6 +109,7 @@ export const ApiConfigSelector = ({
 							<Button
 								variant="ghost"
 								size="icon"
+								tabIndex={-1}
 								onClick={(e) => {
 									e.stopPropagation()
 									togglePinnedApiConfig(config.id)