refactor(store): more hex->Word changes

[igamigo]

• Updated the SQLite store to persist all word-like values like account, code, and storage commitments, vault roots and keys, note IDs, nullifiers, script roots, recipient digests, and transaction IDs as serialized BLOBs instead of hex-encoded text. This extends the work from refactor(store): cleaner SQL types #2309 to the remaining tables and their read/write paths.