1. Admin role gate: Nav link only shows for admin role users, admin
layout redirects non-admins to /home with access denied message
2. Profile update: Replace stubbed setTimeout with real API call to
profileService.updateProfile(), add empty name validation
3. Error boundaries: Wrap each dashboard widget in svelte:boundary
with error UI showing widget name, error message, retry button
4. Payment page: Replace alert() with toast notification for
unfinished payment integration (no more browser alerts)
5. Form validation: Add name validation in profile update
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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