Add keyboard shortcut for star rating

[redge76]

Description

This PR adds a keyboard shortcut to change the star rating of an image directly from the keyboard. The shortcut is now visible in the shift+? dialog,

The star rating shortcut is documented in the shift+? dialog, but it seems a bit too specific to be documented there. Maybe it would be better placed in another modal specific to the asset viewer ?

How Has This Been Tested?

• Verified that pressing the star rating keyboard shortcut changes the star rating as expected.
• Checked that pressing Shift + ? displays the shortcuts modal with explanations.

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/)

[jrasm91]

Implemented in #24620