[HIGH] New UIs for better bot response (#4846)

* Refactor TextAttachment

* Add schema.org

* Add @types/jest

* Refactor Markdown-It plugins

* Fix test

* Add ModalDialogComposer

* Use constants

* Add link definitions

* Clean up

* Cosmetics

* Cosmetics

* Add citation, definitions, provenance, vote buttons

* Use ReplyAction instead of Person

* Clean up styles

* Style slotted

* Localize feedback buttons

* Focus indicator cosmetics

* Click on citation should show modal

* Fix colors

* Fix accessibility on link definitions

* Add open in new window icon

* Clean up

* Show host if no name on link

* Remove transition

* Chevron cosmetics

* Clean up vote buttons

* Use VoteAction directly

* Fix @context

* Add onErrorResumeNext

* Allow different type for default value

* Clean up

* Simplify

* Fix test

* Simplify

* Add test for Thing

* Add tests

* Add tests

* Add test

* Add test entrypoints

* Add tests

* Add screenshots

* Add entries

* Fix px

* Fix slotted activity status padding

* Fix test

* Fix tests

* Fix tests

* Migrate test

* Delete old test

* Fix send status padding

* Fix screenshot

* Fix tests

* Update snapshots

* Fix tests

* Rename CSS variables

* Fix prop types

* Fix flaky test

* Update screenshots

* Fix screenshots

* Typo

* Add comment

* Update scrollbar size

* Update screenshot

* Fix tests because DOM go deeper

Author: compulim