feat: Per-widget PowerShell Permission Toggle (UI)

[sametcn99]

Add a per-widget PowerShell permission control in the application UI that lets users grant or revoke PowerShell access for each widget. The UI toggle persists the user's decision and is enforced by the host API: when a widget's PowerShell permission is revoked, any host API calls from that widget that would invoke PowerShell are blocked locally (no code or commands are sent to the PowerShell host). The feature should integrate with the existing consent model, default to safe/denied for new widgets, and ensure settings survive restarts. Acceptance: users can view and change per-widget PowerShell permission in the app, revoked widgets cannot reach the PowerShell bridge, and consent state is persisted.