remote-control: add --name flag for session display name

Problem

When using claude remote-control, the session name shown in the Claude app (phone/web) is always "Remote control session" with the working directory path. When running multiple remote-control sessions (e.g. one per repo/task), they are hard to distinguish.

Proposed Solution

Add a --name or --label flag to claude remote-control that sets a display name for the session in the Claude app UI.

claude remote-control --name "marketing-assets-013"

Use Case

I launch multiple claude remote-control sessions in tmux windows, each for a different repo/task. On the phone side, they all look the same. A custom name would make it easy to identify which session is which.