Save wallets by default; reveal the recovery phrase in two steps

A seed that only lives in this tab is one refresh from gone, and that
surprise costs people money — so a wallet now saves itself to the device
when it's opened or committed, no button required. No password is set
(Settings still offers one), and a locked existing vault is left to the
manual Save button since writing it needs their password.

The recovery card gains a middle step: the first click opens the grid
with the words masked — the warning and the shape of what's coming are
on screen before anything readable is — and a second click shows them.
Copy only appears once they're visible.

Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Wvj4aoeMZwA7VUGdJP9Swi

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