## Summary
- Replace cartoon default avatars with a neutral silhouette across H5/PC/admin/api static assets
- Remove the white background from the H5 login logo
- Shrink the member page avatar display size
## Test plan
- [x] Diff limited to intentional demo-playedu avatar/logo/member size files
- [x] Member page avatar size reduced in index.tsx
- [ ] Spot-check H5 login logo and member avatar in running demo if available
Related to #9
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Summary
Test plan
Related to #9