fix: Require any interface permission to use RPC methods

[FrederikBolding]

Require Snaps to have at least one of the permissions required to display UI before allowing use of RPC methods.

https://consensyssoftware.atlassian.net/browse/WPC-500

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Note

Medium Risk
Changes authorization behavior for multiple RPC entrypoints; risk is mainly compatibility/behavioral (previously-allowed calls now fail) and depends on correct hasPermission wiring and the UI_PERMISSIONS list.

Overview
Interface-management RPC methods now require the caller Snap to have at least one UI-capability permission before executing: snap_createInterface, snap_updateInterface, snap_getInterfaceState, snap_getInterfaceContext, and snap_resolveInterface short-circuit with providerErrors.unauthorized when UI_PERMISSIONS checks fail.

This introduces a shared UI_PERMISSIONS constant in utils.ts, wires a new hasPermission hook into each handler, and updates/expands Jest coverage to assert the unauthorized error behavior (plus minor coverage threshold adjustments).

^{Written by Cursor Bugbot for commit ebc981a. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.58%. Comparing base (225bb57) to head (ebc981a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3864   +/-   ##
=======================================
  Coverage   98.58%   98.58%           
=======================================
  Files         428      428           
  Lines       12372    12389   +17     
  Branches     1922     1927    +5     
=======================================
+ Hits        12197    12214   +17     
  Misses        175      175           

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