chore(walletsync): improve walletsync lib

[gre]

✅ Checklist

• npx changeset was attached.
• Covered by automatic tests.
• Impact of the changes:
  • live-wallet

📝 Description

this improve live-wallet/walletsync stack to allows a smooth integration in LLD. ( this code changes is extracted from #7300 )

• createWalletSyncWatchLoop
  • differentiate the polling interval from the initial timeout. ultimately moving to just using setTimeout for both.
  • introduces onStartPolling which allows us to know when to set the last error (given by onError) back to null
  • introduces onUserRefreshIntent which is returned by the watch loop and allows the user to force a refresh. we debounce it with a setTimeout.
• introduce walletStateExportShouldDiffer predicate to know if live-wallet store's export have changes
• introduce wsStateSelector to access the WSState

❓ Context

• JIRA or GitHub link: na

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🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)

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