Allow deleting/clearing old Remote Control sessions on mobile app

When using Remote Control sessions from the mobile app, closed/finished sessions continue to appear in the session list even after they've been terminated on the computer. Over time, this creates a long list of stale sessions (Idle, Starting up, Ready for review, Archived) that makes it hard to identify which session is currently active.

Current behavior

• Old Remote Control sessions persist in the mobile app's session list indefinitely
• No visible option to delete or bulk-clear sessions on mobile (no swipe-to-delete, no long-press menu)
• The web interface (claude.ai/code) is a landing page with no session management
• The CLI has no sessions delete subcommand

Expected behavior

• Ability to delete individual sessions (e.g., swipe-to-delete or a menu option)
• Ability to bulk-delete/clear old sessions
• Ideally, automatically clean up sessions that have been idle/terminated for a long time

Platform

iOS (Claude mobile app)