fix: Wait for unlock before handling manageAccounts requests

[FrederikBolding]

getSnapKeyring fails when the client is locked since we cannot access the KeyringController. As with every other Snaps API, we want to wait for the client to be unlocked before allowing use of functionality that accesses the vault.

---

Note

Adds getUnlockPromise to manageAccounts and awaits unlock before routing requests to the snap keyring, with tests updated accordingly.

• RPC method snap_manageAccounts:
  • Add getUnlockPromise to method hooks and await getUnlockPromise(true) before calling getSnapKeyring and routing to handleKeyringSnapMessage in manageAccounts.ts.
  • Update specificationBuilder and manageAccountsBuilder.methodHooks to include getUnlockPromise.
• Tests:
  • Update manageAccounts.test.ts to include getUnlockPromise in hooks and mocks; maintain validation and routing assertions.
• Misc:
  • Slightly adjust coverage threshold for lines in jest.config.js.

^{Written by Cursor Bugbot for commit ba55813. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.29%. Comparing base (6f54282) to head (ba55813).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3686   +/-   ##
=======================================
  Coverage   98.29%   98.29%           
=======================================
  Files         417      417           
  Lines       11924    11925    +1     
  Branches     1851     1851           
=======================================
+ Hits        11721    11722    +1     
  Misses        203      203           

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