Ark gifts: instant off-chain bearer gifts inside the gift flow

Ark can't presign a bearer spend, so an ark gift is a vtxo sent to an
ephemeral ark identity whose seed IS the link (/ag/<code>: net, amount,
32-byte secret). The claimer rebuilds the identity, reads its mailbox,
and sweeps to their own ark address — instant, free, and it works for a
brand-new empty wallet with zero on-chain footprint. The sender keeps
the secret, which is what makes revoke possible (first cosign wins).

The gift form gains an On-chain/Ark source toggle when ark balance
exists; ark gifts skip the lock/split logic entirely. Claim, choose-
wallet, already-claimed, and nostr-locked (/lg/) flows all branch by
code kind; unclaimed ark gifts list with one-tap revoke and lazily
mark themselves claimed via GetVtxoStatus. Features stay decoupled:
gifts asks for ark support via the new ctx.hook seam, so either
feature builds alone.

Also restores goHome in the feature ctx — lost in the plugin-seam
extraction, it made the already-claimed screen throw on render.

Co-Authored-By: Claude Fable 5 <[email protected]>

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