fix: Refresh photo after updating featured photo

[stewx]

Description

This forces an update of the person thumbnail in the asset viewer detail panel when you set a new featured photo.

Fixes #21967

How Has This Been Tested?

Manual testing

Screenshots (if appropriate)

stalepicfix.mp4

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if applicable
• I have no unrelated changes in the PR.
• I have confirmed that any new dependencies are strictly necessary.
• I have written tests for new code (if applicable)
• I have followed naming conventions/patterns in the surrounding code
• All code in src/services/ uses repositories implementations for database calls, filesystem operations, etc.
• All code in src/repositories/ is pretty basic/simple and does not have any immich specific logic (that belongs in src/services/)

Please describe to which degree, if any, an LLM was used in creating this pull request.

Claude Code generated the bug fix

[danieldietzler]

Haven't tested it but the code looks good to me.