when using resume allow people to favorite sessions so they are easily found

### Describe the feature or problem you'd like to solve

finding sessions and resuming sessions should be easier

### Proposed solution

int the --resume menu allow users star (*) sessions and add a favorites (starred) section just like Local, Remote, All

### Example prompts or workflows

copilot --resume

All, Favorites, Local, Remote

| * | # | Summary |
|---|---:|---|
| * | 1 | Create New service |
| | 2 | Summarize Emails |

### Additional context

copilot --resume

All, Favorites, Local, Remote

| * | # | Summary |
|---|---:|---|
| * | 1 | Create New service |
| | 2 | Summarize Emails |

Start with the `copilot --resume` entry point and trace how the resume menu lists and selects sessions. Determine where session star state and the Favorites section belong; done means users can star sessions and find them under Favorites alongside All, Local, and Remote.

Written by the indexing model from the issue text.