webui: convert SketchViewModeSelect to use SketchTailwindElement with Tailwind CSS

Replace LitElement shadow DOM component with SketchTailwindElement base class
to use Tailwind CSS utility classes instead of component-scoped CSS styles.

Also adds tailwind support for CSS container queries in addition to media
queries.

Co-Authored-By: sketch <hello@sketch.dev>
Change-ID: s0eeb80dd54594375k
diff --git a/webui/tailwind.config.js b/webui/tailwind.config.js
index 577ab81..919d100 100644
--- a/webui/tailwind.config.js
+++ b/webui/tailwind.config.js
@@ -1,8 +1,5 @@
 /** @type {import('tailwindcss').Config} */
 export default {
   content: ["./src/**/*.{js,ts,jsx,tsx,html}"],
-  theme: {
-    extend: {},
-  },
-  plugins: [],
+  plugins: ["@tailwindcss/container-queries"],
 };