* webui : improve accessibility for visually impaired people
* add a11y for extra contents
* fix some labels being read twice
* add skip to main content
* rework the input area
* process selected file
* change all icons to heroicons
* fix thought process collapse
* move conversation more menu to sidebar
* sun icon --> moon icon
* rm default system message
* stricter upload file check, only allow image if server has mtmd
* build it
* add renaming
* better autoscroll
* build
* add conversation group
* fix scroll
* extra context first, then user input in the end
* fix <hr> tag
* clean up a bit
* build
* add mb-3 for <pre>
* throttle adjustTextareaHeight to make it less laggy
* (nits) missing padding in sidebar
* rm stray console log
