Use ALF for signup flow, improve a11y of signup (#3151)

* Use ALF for signup flow, improve a11y of signup

* adjust padding

* rm log

* org imports

* clarify allowance of hyphens

Co-authored-by: surfdude29 <149612116+surfdude29@users.noreply.github.com>

* fix a few accessibility items

* Standardise date input across platforms (#3223)

* make the date input consistent across platforms

* integrate into new signup form

* rm log

* add transitions

* show correct # of steps

* use `FormError`

* animate buttons

* use `ScreenTransition`

* fix android text overflow via flex -> flex_1

* change button color

* (android) make date input the same height as others

* fix deps

* fix deps

---------

Co-authored-by: surfdude29 <149612116+surfdude29@users.noreply.github.com>
Co-authored-by: Samuel Newman <mozzius@protonmail.com>

assets/icons/calendar_stroke2_corner0_rounded.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24"><path fill="#000" fill-rule="evenodd" d="M8 2a1 1 0 0 1 1 1v1h6V3a1 1 0 1 1 2 0v1h2a2 2 0 0 1 2 2v13a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h2V3a1 1 0 0 1 1-1ZM5 6v3h14V6H5Zm14 5H5v8h14v-8Z" clip-rule="evenodd"/></svg>