Ark state moves to IndexedDB: raw bytes on disk, memory-fronted, write-behind.

localStorage held a deep wallet's ark state as ~700KB of JSON (UTF-16 on
disk), parsed on every boot and stringified on every save, and the wallet
cache blob carried a second ~600KB copy. src/ark/store.js keeps the state
in IndexedDB (db coinos-ark) with each coin's signed bytes as a Uint8Array,
fronted by an in-memory map so loadArkState/saveArkState stay synchronous:
reads return clones, writes coalesce (200ms) and flush immediately when the
page hides. Existing localStorage copies migrate on first open (newest _rev
wins) and are removed only after the IndexedDB write completed; no
IndexedDB means localStorage exactly as before. Records keep their
btc-wallet-cache:<id>:ark… keys, and a wallet wipe clears both stores via
the new per-feature wipeCache hook.

The ark cache extension is now syncOnly: it still rides the sync snapshot
(and the Blossom blob) but the local wallet cache no longer embeds it —
measured on a live wallet the cache blob went from 655KB to 10KB.

Verified in the live tab: all wallets migrated, bytes raw on disk, balance
and coin set unchanged, localStorage ark keys gone. tools/ark-store-test.js
covers migration by _rev, clone-on-read, write-behind, wipe and fallback.

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

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