Token metadata display (symbol + decimals) in the dashboard

[gbengaeben]

Category: Frontend UX | Priority: Low | Dependencies: none | Out of scope: token logos, price conversion

Description & Context: Roadmap item. Streams show raw base units (stroops) — "1,000,000,000" vs "1,000" is indistinguishable. Read symbol()/decimals() from the SEP-41 token contract.

Acceptance Criteria / DoD:

• getTokenMetadata(token) in frontend/src/lib/contracts/ (read-only contract call to symbol/decimals), cached per token address (module-level Map)
• format.ts gains formatAmount(baseUnits, decimals); all amount displays use symbol + formatted value, falling back to raw units when metadata is unavailable (e.g., RPC down)
• tsc -b clean

How to verify: Create a stream in a non-native SAC token — the card shows e.g. 1,000.0000000 USDC instead of 10000000000.