bark: Refactor Wallet::open

Steven Rooserequested to merge
open-wallet into master

Summary by CodeRabbit

  • Refactor
    • Updated wallet initialization/opening to a seed-based flow with an OpenWalletArgs configuration option set (including unified open behavior and daemon/persistence/lock configuration).
  • New Features
    • Added automatic default persistence backend selection per platform (including IndexedDB for wasm and sqlite elsewhere).
    • Optional wallet fingerprinting now namespaces browser lock keys.
  • Bug Fixes
    • Unsupported targets now fail gracefully instead of panicking.
    • Adjusted server-connection error messaging expectations.
  • Documentation / Examples
    • Updated docs and examples to use the new wallet open-and-persist flow.
Edited by coderabbit

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