enhancement(web): add react suspense and improve DX (#1089)

* add react suspense, fix broken stuff, clean up code, improve DX

enhancement: added react suspense + spinner to show loading (still can be added in certain places)
chore: cleaned up Header/NavBar code
chore: cleaned up DeleteModal code
chore: cleaned up other relevant code
enhancement: changed remove button style to be much more pleasant (see e.g. filter tabs)
fix: made active tab on filters page to be blue (as it should've been) when active
fix: fixed ghost delimiter which was only visible when DeleteModal was active in FormButtonGroup
chore: removed most of linter warnings/errors
fix: fixed incorrect/double modal transition in FilterExternalItem
fix: fixed incorrect z-height on Options popover in Settings/IRC (would've been visible when Add new was clicked)
enhancement: improved robustness of all Context classes to support seamless new-feature expansion (#866)
enhancement: improved expand logic (see #994 comments)

* reverted irc expand view to previous design

* forgot to propagate previous z-height fix

* jinxed it

* add license header to new files

---------

Co-authored-by: martylukyy <35452459+martylukyy@users.noreply.github.com>
Co-authored-by: Kyle Sanderson <kyle.leet@gmail.com>

web/src/forms/settings/DownloadClientForms.tsx

@@ -833,6 +833,7 @@ export function DownloadClientUpdateForm({ client, isOpen, toggle }: updateFormP
       >
         <DeleteModal
           isOpen={deleteModalIsOpen}
+          isLoading={deleteMutation.isLoading}
           toggle={toggleDeleteModal}
           buttonRef={cancelModalButtonRef}
           deleteAction={deleteAction}