server : (webui) migrate project to ReactJS with typescript (#11688)

* init version

* fix auto scroll

* bring back copy btn

* bring back thought process

* add lint and format check on CI

* remove lang from html tag

* allow multiple generations at the same time

* lint and format combined

* fix unused var

* improve MarkdownDisplay

* fix more latex

* fix code block cannot be selected while generating

examples/server/webui/src/index.scss

@@ -0,0 +1,67 @@
+@use 'sass:meta';
+
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+.markdown {
+  h1,
+  h2,
+  h3,
+  h4,
+  h5,
+  h6,
+  ul,
+  ol,
+  li {
+    all: revert;
+  }
+  pre {
+    @apply whitespace-pre-wrap rounded-lg p-2;
+    border: 1px solid currentColor;
+  }
+  p {
+    @apply mb-2;
+  }
+  /* TODO: fix markdown table */
+}
+
+.show-on-hover {
+  @apply md:opacity-0 md:group-hover:opacity-100;
+}
+.btn-mini {
+  @apply cursor-pointer hover:shadow-md;
+}
+.chat-screen {
+  max-width: 900px;
+}
+
+.chat-bubble-base-300 {
+  --tw-bg-opacity: 1;
+  --tw-text-opacity: 1;
+  @apply bg-base-300 text-base-content;
+}
+
+/* Highlight.js */
+[data-color-scheme='light'] {
+  @include meta.load-css('highlight.js/styles/stackoverflow-light');
+}
+[data-color-scheme='dark'] {
+  @include meta.load-css('highlight.js/styles/stackoverflow-dark');
+}
+[data-color-scheme='auto'] {
+  @media (prefers-color-scheme: light) {
+    @include meta.load-css('highlight.js/styles/stackoverflow-light');
+  }
+  @media (prefers-color-scheme: dark) {
+    @include meta.load-css('highlight.js/styles/stackoverflow-dark');
+  }
+}
+.hljs {
+  background: transparent !important;
+  padding: 0.5em !important;
+}
+
+.katex-display {
+  margin: 0 0 !important;
+}