Ark: persist vtxo bytes as base64 (a third smaller than hex); hex still read, hex still on the wire.

The live coins' signed bytes are most of a deep wallet's state — 560KB of
hex, which localStorage then holds as UTF-16. vtxoBytesToStr/FromStr in
proto.js persist base64 and read either form, _addVtxo writes base64, and
pruneArkState converts hex to base64 on every save, so an existing state
migrates itself the first time it saves. Measured on a live deep wallet:
904KB → 665KB (-26%), all 41 coins decoding identically.

The sync wire (slimArkForSync) keeps sending hex for now: a device still
on an older build would otherwise fail to decode every coin merged from a
newer one. Flip it once pre-2026-09-10 builds are gone.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Nw1Dijik1tLVKRM1WkU7xE

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