Add dangerously skip permissions to shift+tab mode cycle

Feature Request

Currently, shift+tab (chat:cycleMode) cycles through three permission modes: default, auto-accept edits, and plan.

It would be useful to include dangerously skip permissions (bypassPermissions) as an option in that cycle, perhaps gated behind the existing skipDangerousModePermissionPrompt setting so users who have already opted in can quickly toggle it without restarting the session.

Current behavior

• shift+tab cycles: default → auto-accept edits → plan → default
• Dangerous mode is only accessible via --dangerously-skip-permissions CLI flag or permissions.defaultMode in settings

Desired behavior

• shift+tab cycles: default → auto-accept edits → plan → dangerously skip permissions → default
• Ideally gated behind skipDangerousModePermissionPrompt: true so it doesn't appear for users who haven't opted in