Note

Medium Risk
Changes the permission-request flow UI/logic by removing the blocking existing-permissions dialog and replacing it with a new banner driven by background permission lookups; this impacts core confirmation rendering and could regress gating/UX if the new status logic or wiring is incorrect.

Overview
Adds an existing-permissions banner to the permission confirmation screen that links out to a MetaMask “gator permissions” page, showing a warning when the user previously granted a similar permission type (stream vs periodic) and an info banner when prior permissions exist but are dissimilar.

Removes the entire core/existingpermissions dialog flow (content rendering, token-metadata formatting, UI components, and tests) and replaces it with a new ExistingPermissionsService.getExistingPermissionsStatus() in services/ that computes a single ExistingPermissionsState used during confirmation rendering.

Updates the permission lifecycle/orchestrator and handler types to fetch this status in parallel with the intro flow (with a non-rejecting promise) and pass it through to PermissionHandlerContent; updates i18n strings accordingly and adjusts snapshot tests for the new banner output.

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