Describe the bug

The session rename modal displays "Edit Session Description" but should say "Edit Session Name" to match the current implementation. This is a minor UI inconsistency - the functionality works correctly, but the label is outdated.

This would update the modal title to sync with changes in PR #5279 (to use the name field instead of the legacy description field).

To Reproduce
Steps to reproduce the behavior:

1. Open goose Desktop
2. Click the sidebar button to open the sidebar
3. Click View All at the bottom of the Chat section
4. Hover over any session card
5. Click the Edit button (pencil icon)
6. Observe the modal title says "Edit Session Description"

Expected behavior
The modal title should say "Edit Session Name" to match the current backend implementation and be more consistent with how users might naturally think of display names.

Screenshots
none

Please provide the following information

• OS & Arch: macOS (applies to all platforms)
• Interface: UI
• Version: v1.21.0+
• Extensions enabled: N/A (UI issue)
• Provider & Model: N/A (UI issue)

Additional context
This is a cosmetic issue that doesn't affect functionality. The field being edited is technically the name field, so updating the modal title would make it more accurate when saying you can rename the session in the docs.

Related: The backend and API use session.name, and the description field is maintained only for backward compatibility with legacy sessions.