feat: integrate two factor authentication (#626)

* feat: integrate SNJS MFA with web

* fix: create rudimentary typings file for qrcode.react

* chore: lint fixes

* fix: address PR feedback

* fix: address PR feedback

* fix: address PR feedback 2

* fix: replace spread props on TwoFactorAuthWrapper component

* chore: change null check to undefined check

app/assets/javascripts/preferences/components/PreferencesPane.tsx

@@ -0,0 +1,37 @@
+import { FunctionComponent } from 'preact';
+
+const HorizontalLine: FunctionComponent<{ index: number; length: number }> = ({
+  index,
+  length,
+}) =>
+  index < length - 1 ? (
+    <hr className="h-1px w-full bg-border no-border" />
+  ) : null;
+
+export const PreferencesSegment: FunctionComponent = ({ children }) => (
+  <div className="flex flex-col">{children}</div>
+);
+
+export const PreferencesGroup: FunctionComponent = ({ children }) => (
+  <div className="bg-default border-1 border-solid rounded border-gray-300 px-6 py-6 flex flex-col gap-2">
+    {Array.isArray(children)
+      ? children
+          .filter((child) => child != undefined && child !== '')
+          .map((child, i, arr) => (
+            <>
+              {child}
+              <HorizontalLine index={i} length={arr.length} />
+            </>
+          ))
+      : children}
+  </div>
+);
+
+export const PreferencesPane: FunctionComponent = ({ children }) => (
+  <div className="preferences-pane flex-grow flex flex-row overflow-y-auto min-h-0">
+    <div className="flex-grow flex flex-col py-6 items-center">
+      <div className="w-125 max-w-125 flex flex-col gap-3">{children}</div>
+    </div>
+    <div className="flex-basis-55 flex-shrink" />
+  </div>
+);