[Feature Request] Add session-scoped vs global permission choices to approval prompts

Bug Description
Title: Add "session only" vs "global" choice to permission prompts

Description:

When Claude Code asks for permission to perform an action (edit files, run commands), it would be helpful to have the option to choose:

1. Approve for this session only - permission expires when session ends
2. Approve globally - permission persists across sessions

Currently, the approval scope is determined automatically by tool type (bash = permanent, edits = session). Having user control would be more flexible.

Use case:

• Sometimes I want to temporarily allow a risky command just once
• Other times I want to permanently allow a safe command I use frequently
• Currently there's no way to choose at the moment of approval

Environment Info

• Platform: darwin
• Terminal: iTerm.app
• Version: 2.1.7
• Feedback ID: a47396e9-6350-4393-9de6-2ac6461607a6