fixed activities sorting.
less oddities from me not knowing how to use flex boxes. Also kinda
standardised a button-inside-input thing, so added a .gap-<n> >
.inside-input selector which works on gap-1 and gap-2.
for #363, adds /my/account/password/reset. Navigate to it to skip
pressing the "forgot password?" button on the login screen. Works
with the nice-ish onpopstate override thing I put in setup.ts a
while ago. Maybe I should make it a module.
