@/ui/ Fix Bake override key platform

[kilemensi]

Description

Cause:

• Bake override key should be platform (singular), not platforms.
• *.platforms=... triggers unknown key: platforms.
  Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)

Screenshots

N/A

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

[kilemensi]

@claude review