[Feature Request] Add cwd-based filtering option for /resume session picker

Bug Description
Title: Restore cwd-based filtering for /resume (or add a flag)

Previously, running claude --resume (or /resume) showed only sessions matching the current
working directory, which made it easy to pick the right one. Now the picker lists sessions from all
projects, which is noisy and slower to navigate when you work across many repos.

Could you either:

1. Restore the previous behavior of filtering by cwd by default, or
2. Add a flag (e.g. --resume --cwd or a setting) to opt into cwd-filtered listing?

--continue only loads the most recent session and isn't a substitute when I need to pick among
several sessions for the current project.

Thanks!

Environment Info

• Platform: linux
• Terminal: vte-based
• Version: 2.1.104
• Feedback ID: 1e248ddc-9640-46a0-9a67-9eb4018fa5b5