[home] port over account deletion flow from website (#17620)

* save: port over account deletion logic from website
TODO: redesign for mobile, get dialogs working

* update design, remove dialog,

[home] port over account deletion flow from website (#17620)

* save: port over account deletion logic from website
TODO: redesign for mobile, get dialogs working

* update design, remove dialog, wire up flows

* improve design for view where you can't delete account yet

* typography improvement

* prevent layout jump in sms button

* notify when user sends too many SMS

* refetch all queries after new sessionSecret is populated

* port over website's APIv2 client because it handles responses better (responseType: 'void' in particular)

* remove old snapshot

* add note to sync code with website

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