feat(stellar-wallet-snap): add recoverable confirmation refresh outcome

[khanti42]

Explanation

Today, confirmation refresh treats all transaction re-validation failures as halt: omit the security scan, show a banner, and stop auto-cron. That is correct for hard failures (insufficient balance, trustline, etc.), but SEP-29 RequiresMemo is different — the user can fix it in-dialog (add a memo) and the UI needs to re-trigger refresh + scan without reconstructing securityScanRequest.

This PR adds a first-class recoverable?: boolean on ConfirmationContextRefreshResult:

• halt — hard validation failure; omit scan this cycle; do not auto-reschedule; banner error.
• recoverable — soft validation failure (currently RequiresMemoException); same omit-scan + pause auto-cron + banner behavior, but keep securityScanRequest intact so a later UI scheduleBackgroundEvent can rebuild and re-scan.
• Other validation errors keep halt: true.
• Handler omits the scan refresher when the transaction refresher returns halt or recoverable, and does not auto-reschedule in either case.

No confirm UI / MemoEdit changes here — this is the platform primitive so memo confirm UI can land on top cleanly.

References

• Fixes WPN-2041
• Parent: WPN-2033
• Builds on: fix(stellar-wallet-snap): display transaction error message + skip security scanning when failed during the background validation in confirmation dialog  #282 (halt confirmation refresh)
• Unblocks memo confirm UI (WPN-2034 / WPN-2036); pairs with memo attach PR (WPN-2035)

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud