Use shared button components in queue overlay (#6793)

## Summary
- replace raw button elements in queue progress overlay UI with shared
IconButton/TextButton/IconTextButton components
- remove forced justify-start from IconTextButton base and add explicit
alignment where needed
- keep queue overlay actions consistent with button styling patterns

## Testing
- pnpm typecheck
- pnpm lint:fix

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6793-Use-shared-button-components-in-queue-overlay-2b26d73d3650814d9ebfebba74226036)
by [Unito](https://www.unito.io)

src/components/button/IconButton.vue

@@ -24,7 +24,7 @@ import {
 import { cn } from '@/utils/tailwindUtil'
 
 interface IconButtonProps extends BaseButtonProps {
-  onClick: (event: Event) => void
+  onClick?: (event: MouseEvent) => void
 }
 
 defineOptions({

src/components/button/IconTextButton.vue

@@ -47,7 +47,7 @@ const {
 } = defineProps<IconTextButtonProps>()
 
 const buttonStyle = computed(() => {
-  const baseClasses = `${getBaseButtonClasses()} justify-start! gap-2`
+  const baseClasses = `${getBaseButtonClasses()} justify-start gap-2`
   const sizeClasses = getButtonSizeClasses(size)
   const typeClasses = border
     ? getBorderButtonTypeClasses(type)