feat(ui): add token icons for BERA, USDC.E, and USDT variants

Added token icon assets for:
- BERA token (bera.svg)
- Bridged USDC (usdc.e.svg) - uses USDC icon
- USDT with special character symbols (usd₮.svg)
- USDT0 (usd₮0.svg)

Icons were added to:
- UI assets source (apps/ui/assets/token-icons/)
- Dialog app (apps/dialog/public/ui/token-icons/)
- UI Playground (apps/ui-playground/public/ui/token-icons/)
- ID app (apps/id/public/icons/)

Author: AyveeBera