Show spinner on local tile

When connection to the homeserver or the local transport is lost, show a spinner on the name tag of the local user media tile:

https://www.figma.com/design/aOEkaJtaBmPy058V7uoqVr/Element-Call-Updates---2026?node-id=971-24507&t=cZED3OTPOsXb0wy7-4

In cases where there is no name tag, it should look like this:

https://www.figma.com/design/aOEkaJtaBmPy058V7uoqVr/Element-Call-Updates---2026?node-id=1560-25718&t=ae2fanXuOQlg58sd-4

Start from the local user media tile and trace how it renders the name tag and the no-name-tag state. Use the linked Figma designs as the visual reference, then verify that a spinner appears when the homeserver or local transport connection is lost in both layouts.

Written by the indexing model from the issue text.