Ark: partial moves to Savings via an exact-amount split

Into Savings now has an amount field with a Max button. Max (or the full
balance) keeps the existing whole-balance cooperative offboard. A
partial amount first mints a vtxo of exactly that amount with a
self-send — the mailbox delivers self-sends, verified on regtest — then
offboards just that vtxo, so the number typed is the number that leaves
Spending (fees still come off what arrives, shown on the success
screen). startOffboard accepts a vtxo subset for this; an exact-match
vtxo skips the split. The unilateral exit page remains reachable from a
link under the field.

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

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