fix: redesign cat ears (#10039)

* fix: viewing disgusting objects when user is a cat with having transparent avatar

* chore: mask cat ears when useBlurEffect is enabled

* fix: typo

* style: add comment

* chore: shrink mask

* chore: blur mask

* refactor: minify

* chore: use SVG to determine ear color

* style: comment

* refactor: use `<component>`

* refactor: separate cat definitions

* refactor: use singleton SVG definitions

* perf: use CSS instead of SVG

* refactor: unused definer

* refactor: not used anymore

* refactor: minify

* refactor: minify

* fix: import