Prepare command bar to support modeling commands (#1184)

* Tweak toaster look and feel

* Add icons, tweak plus icon names

* Rename commandBarMeta to commandBarConfig

* Refactor command bar, add support for icons

* Create a tailwind plugin for aria-pressed button state

* Remove overlay from behind command bar

* Clean up toolbar

* Button and other style tweaks

* Icon tweaks follow-up: make old icons work with new sizing

* Delete unused static icons

* More CSS tweaks

* Small CSS tweak to project sidebar

* Add command bar E2E test

* fumpt

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* fix typo in a comment

* Fix icon padding (built version only)

* Update onboarding and warning banner icons padding

* Misc minor style fixes

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

src/components/WasmErrBanner.tsx

@@ -1,7 +1,6 @@
 import { Dialog } from '@headlessui/react'
 import { useState } from 'react'
 import { ActionButton } from './ActionButton'
-import { faX } from '@fortawesome/free-solid-svg-icons'
 import { useKclContext } from 'lang/KclSinglton'
 
 export function WasmErrBanner() {
@@ -26,7 +25,8 @@ export function WasmErrBanner() {
             Element="button"
             onClick={() => setBannerDismissed(true)}
             icon={{
-              icon: faX,
+              icon: 'close',
+              className: 'p-1',
               bgClassName:
                 'bg-warn-70 hover:bg-warn-80 dark:bg-warn-70 dark:hover:bg-warn-80',
               iconClassName: