[FEATURE] Fleetview, control project/group sort order (alphabetical / pin to top)

### Preflight Checklist

- [x] I have searched [existing requests](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20label%3Aenhancement) and this feature hasn't been requested yet
- [x] This is a single feature request (not multiple features)

### Problem Statement

When in Claude Agent Fleetview screen, in project view, it is possible to reorder agents within a project, but it is not possible to reorder the projects themselves. This would be really useful.

Now
```
~/dev/foo/project1
∙ Issue 449 Stopped · stopped from session 1h

~/dev/foo
✻ housekeeping maintenance Done · Draft PR https://github.com/foo/pull/22 #14 16h

~/dev/foo/project2
✻ 22-598 Done · AB#598→Resolved, AB#597 AC3 posted, handover.md updated… #22 7m
```

### Proposed Solution

Use the current `shift+↑↓ to reorder` command, but extend it to apply to projects.

Proposed
```
~/dev/foo
✻ housekeeping maintenance Done · Draft PR https://github.com/foo/pull/22 #14 16h

~/dev/foo/project1
∙ Issue 449 Stopped · stopped from session 1h

~/dev/foo/project2
✻ 22-598 Done · AB#598→Resolved, AB#597 AC3 posted, handover.md updated… #22 7m
```

### Alternative Solutions

Do this automatically when loading Fleetview

### Priority

Medium - Would be very helpful

### Feature Category

CLI commands and flags

### Use Case Example

_No response_

### Additional Context

Similar to https://github.com/anthropics/claude-code/issues/66196

No files or tests are named. Start by locating the Fleetview project view and the existing shift+↑↓ agent-reordering command, then review the related issue 66196. Done should mean project groups can be reordered in Fleetview, with the intended ordering behavior confirmed against the proposed manual and automatic alternatives.

Written by the indexing model from the issue text.